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PIC Versatile IDE - Micro-GT PIC Ultimate

Author: Prof. Dr. Marco Gottardo
Email:  ad.noctis@gmail.com

Prof. Dr. Marco Gottardo

Micro G PIC Ultimate

Micro G PIC Ultimate PCB Circuit

To obtain a singleor copy write to the PCB ad.noctis@gmail.com while stocks last

Tutorial available on the Internet for use and operation of the development:

  1. Part one (only in. Doc). How to create the project, obtain the file. Hex and test the operation of the simulator
  2. Part second Tutorial "link the card to the PC via 232
  3. Part Three of the Tutorial "use of 'I / O digital versatile Micro-GT PIC IDE

With I.D.E. is mean Developed Integrated Environment then Cn development system projects microcontrollers, the PIC series, capable of integrating a high number of peripheral devices. The electronic card contains: A programmer compatible serial 8076, housing for a 2x16 character LCD display, the space for a graphic display Glcd (graphic liquid crystal display) 128 x 64 points, an H bridge from 8 amps continuous, a dual full bridge for the L298 drive a stepper motor bipolar or two DC motors to up to 2 amps, a 7-segment LED display 4 digits in controllable multiplexer providing BCD code to the integration of decoding, 16 buttons jumper selectable pull up or pull down in groups of 4, 24 outputs maximum indicated by digital LEDs, Streep direct access to I / O PIC, 8 analog inputs with simulated trimmer. A large number of dip selectable switches and jumpers allow you to change the functionality of various points of connection to the PIC. It can easily connect a high number of actuators. The system is designed to program the PIC 40, 28, 18-pin dual in line, and in other ways ICSP (in circuit serial programming) and you can move the clock signal, or even select an appropriate setting of quartz with a jumper with jumpers.

Micro GT PIC Versatile Demo Board Programmer

The support developed PCB FR4 technology (dual layer) so far 164 mm x 156mm.

After launch the automatic routing of the PCB looks like in the picture below, we note that a single missing link fortunately marginal interest between LED 11 and the jumper SV13. We will attempt to resolve but the problem manually in case of failure must be carried by running this link via a bridge wire wrap. The result is still very satisfactory given the complexity of the circuit and the compact size. The circuit is now optimized by increasing the slopes where possible. will indeed a must to maximize the thicknesses of the zones used to control power, ie insofar as it relates to the bridge chip and H multiwatt L298 to drive a bipolar stepper motor.

PIC Versatile IDE - Micro-GT PIC Ultimate PCB Layout

Download the layout with the routing

In the next image we see a copy of the PCB made.

PCB of Micro GT PIC Versatile Demo Board Programmer

Files gerber construction can be found by contacting bonzisandy88@hotmail.com that will help make you an interpreter ordering at a Chinese factory.

Download PDF Schematic

Download Schematic and PCB in Eagle Format

The underlying picture we can see some examples of the PIC Micro-GT versatile IDE to assembled from Internet users after you get the PCB.

Micro GT PIC Versatile Demo Board Programmer Project

Copy edited by Luca Luise, User www.grix.it. After have made this wonderful specimen, and be signed extensive testing has offered to perform the fittings for the less experts. To know how much it costs you a copy assembled and tested get in touch with him ever passing through at Email: ad.noctis@gmail.com

Micro GT PIC Versatile Demo Board Programmer Complete

Copy performed by Matthew Pontarollo, student of social and cultural center ZIP (industrial area of ​​Padua centrozip@libero.it) In a editions of the basic course of programming PIC. The base is PIC16F877A installed.

Power

Nourish card at any voltage, either continuous or alternating current (entered a bridge rectifier which provides a possible reversal) between a minimum of 15V, since in some points must be 13.2 V for the flasche PIC and must take account of the fall of drop-out of the LM stabilizers, and a value of "ragionaevole" for the endurance of the same. It could be example 18Va.c. or 24V dc, make sure that you alternate straightening the multiply the nominal value of the transformer to the root of two, or 1.4. In any case never exceed 30V, or about value of the LM crash.

Position of the LED that indicates power-system development Micro-GT

Position of the LED that indicates power-system development Micro-GT

Communication with the Micro Serial-GT PIC.

The serial communication even programming with the Micro-GT is via the connector DB9 female mounted on board. Though it would be better connect through a real serial port of a desktop PC the link can also occur via a USB-> RS232 interface for with today's notebook that fitted more to this port flasche the PIC using ICSP mode (in circuit serial programming) for which you need to build in a 5-wire connector, visible in the figure, for which there will be an advantage if respect the same colors.

ICSP connector to be built using 5 position streep female line (if possible meet the colors).

The correct position of ICSP connector is shown in the next figure. you can use either the connector ICSP1 or ICSP2 on board tab, since these are parallel and may even allow the programming of two chips at a time (to an external tab). It is recommended, when they are rispettai the colors, keep Brown on the right. The suggestion of the colors is because it is not yet released the software dedicated "MG-Lab, is taking care of it cu his friend Fabio, provisionally PICPRO2009 we will use the (easily findable on the net) that will recognize the device as "8076", or set as ICPROG JDM reversed cable set (depends on the serial cable used).

ICSP connectors are just above the voltage regulators

ICSP connectors are just above the voltage regulators.

Launching ICPROG 2009, and entering the test section and communication, above right, Power on, indicating it meets the correct position of free end of the ICSP connector of the colored wires in question. maneuver essential for programming the microcontroller. And 'good Always keep the schemes in hand.

PICPROG 2009, during the function tests suggests that pin to connect the wires that are colored were used for the construction of the ICSP connector. These changes every time you change the chip to be programmed.

ICSP settings

ICSP settings

During the communication and the test using the flash you will see PICPROG2009. Three LEDs on the side of the ICSP connector, you'll immediately notice that the sequence is not quite the same as two LEDs will be reversed. Not worry about this, remember that you are using a software expedient, or a provisional until it is ready specific MG-Lab in which the thing is already settled. However, this is only of a signal bit in transit (so no problem),

Signalling LED the state of the bus for programming and communication.

Signalling LED the state of the bus for programming and communication.

The serial cable to be used will type with two CANNON DB9 male connectors on the board side PIN to PIN or a simple extension. Do not perform any intersection.

Wiring diagram for the cable serial to use.

Wiring diagram for the cable serial to use.

Studio Modular project

Module power at two levels

The module allows power circuit with two voltage levels, a suitable device programming PIC approximately 13.5 volts and a TTL (5V) for the normal power of logic circuits. The voltage of 13.2 is obtained exploiting the power generator on pin central regulators uA78xx positive voltage range. On this leg there is a generator 4mA current that constantly pushes toward creating the standard for mass the internal circuitry. By inserting two forward biased diodes between center pin and the mass is added to the regulated voltage twice Vgamma junction voltage = 0.6 volts. We get so much for the 13.2 switch in the pic programming. The PCB was added to a test point in close dell'elettrolitico C9 which provides a ground. discover developing their own projects how useful this point access to the mass.

The lines that we see out of the positive of electrolytic C2 leads the voltage at the connector for programming serial circuit (ICS1 and ICS2).

The voltage regulator IC3 is a uA7805, and provides voltage to all the TTL logic circuit. The Power LED indicates that the device is powered.

Important note: As it is section was designed to power the circuit can be powered with any voltage is alternating though between 9 and 36 times volts which is the maximum limit of the regulator uA7812 we meet first after the diodes.

The power supply section provides about 1 amp more than enough for any state of development in laboratory.

Input module digital

The module includes 16 push buttons on the type of mounting PCB congener for both pressed into action to launch a 1 logical that a 0, depending on how they are configured by jumpers related to streep SV1, SV2, SV3, SV4. Lining up all the jumpers in buttons down the left launched a logical (in fact act as the resistance by pull down while aligning the jumper on the right the same action involves the launch of a logical zero (resistors act as pull up).

The inputs were dissected in groups of 4 through steep SV1, SV2, SV3, SV4 so to maximize the versatility of the circuit. You can simulate such a multiples of 4 buttons is N.C. that N.A. on the machine, such as 4 N.C. e12 NA It 's very useful function of insulation available acting on the dip and dip S11 S12 (open switches). each button If this continues to be nurtured and properly bound elle TTL voltages (remains active configuration jumper on NO and NC), but now we can bring through flat cables each of these signals at any point or even outside of the circuit board after the board told outside the same mass. The direct access to the buttons you can connecting cables to the flat streep SV29 and SV30.

input section of the card Micro-GT, are observed ipost pull-up jumpers, pull-down

Important note: JP3 jumper must be closed when one is going to plan PIC 16F84 or a compatible 18-pin. The closure of JP3 involves connecting to ground Pin 5 is essential for the device's power, obviously this case the line should not be interrupted so the dip S11 must have the mandatory line 4-13 in the ON position. Required in this case is also close the connector SV2 streep mode PULL UP because only then will the lines to ground. Caution polarity reversal of the feeding device even if the card should prevent errors so gross as to be putting that Vss to Vdd positive voltage or floating it does not result in the destruction the CIP. S6 combines the function key to the case of MCLR or PIC16F84 microcontroller pin to pin compatible. If you wish to use this function you need to configure the radio group S5, S6, S7, S8 must with pull-up resistor (jumper flush right on the second group). If you do not have this foresight program in the PIC will not start because it receives constantly reset signal.

Output Module digital

The module includes 24 digital outputs TTL logic level, which has been shown by turning on an LED. Each of the three bytes of output can be excluded by means 1,2,3 dip switches on the S13 with the correspondence:

S13 1 -> PORT D

S13 2 -> C PORT

S13 3 -> PORT D

 

It can be accessed directly the PORT B ​​PORT C PORT D, connected directly to SV18 streep (PORT D), SV22 and SV23 (PORT C) and SV17 (PORT B). In the case of direct access to the Port is not recommended to load the output microcontroller with currents greater than a few tens of milliamps, use a of these outputs to directly drive the coil of a relay would be really a beginner's mistake that leads to damage to the device. Yes also points out that for reasons of circuit simplicity has not been provided for any input / output opto-isolation, on the other hand, this is a system development and not a PLC although laboratory tests they can take the place.

Digital output modules, each LED is indicated by the silkscreen on the 40 pin versionIn yellow resistance network.

Micro-GT PIC base model

For a user beginner to the complete assembly of the Micro-GT could be a load Economic a little annoying but not impossible. While waiting for the technical expertise to use all the modules in the layout you can restriction to assembly of the bulk of the digital I / O. The board takes the form shown in the picture:

Features techniques are still very respectable when compared with many products trade. The basic model shown in the figure shows:

  • 8 inputs Digital configurable jumper in groups of 4 pull-up or pull-down.
  • Free Port Mode which allows for example to isolate the inputs and connect them to a port different.
  • 8 digital outputs, isolated if you want to convert the output to PORTB inputs (figure I put a jumper but deep enough to fit the expected 2-way).
  • 1 serial port 232 switch from planning to supervision arrangements (When a software controls the I / O such as servo motors)
  • two connectors ICSP (in circuit serial programming)
  • 1 to 20 MHz quartz
  • Unit Dual voltage power supply (running at +5 V and +13.2 V programming)
  • 1 socket textool 40 pin.
  • All PIC flaschabili executables and the full version will remain so even in basic version (of course).

We note the ICSP cable position, the brown is the first left, while the Red can be disconnected because there is redundancy in the PCB for that wire.

Fix bug MCLR for use as a base model

When you plan to use the PIC Micro-GT are the versatile IDE 28-pin PIC or 40 as the pin 16F876 or the 16F877, or their equivalent 18 series, can be dispensed with under special conditions of use which the board can provide when PIC installed are of use in reality rather rare. For a more Quick connector ICSP eseguimo na small changes that consists of:

  • Cutting the track that connects the reset button to pin 1
  • remove the solder a few millimeters from the track
  • bending the pins a lower line streep two positions so that we can support from na part of the pitch reset button and the other to the copper track cut we found scraping the tip of the cutter.
  • Weld the streep line in this position, insert a jumper and check the meter if reset by pressing the buzzer sounds between pin 1 of the processor and the mass, or the heat sink controller 7805 (note: do not try with the 7812 because it is not grounded because of the two diodes in series on the center pin).

This simple modification is documented in the following photos:

Cutting the track. The conductor is cut at the Vias (hole metallic) of the track next. As we can see the solder was removed gently scraping the track surface with a knife. This maneuver should be done to give a little of attention even if the card is not really so delicate that it threatens functionality.

Solder the new two-streep positions in place so that we have made. the picture is almost paying attention to the invisible but we can see, is parallel to el deepswitch the left edge, as close to the base textool.

Mode implementation of the program jumper streep sneak in line at two positions, in the photo we see him in blue. I chose this color to highlight its presence.

In programming mode, Streep just sneak it in one of two pins of the line streep (to be the right) and in the left hand sneak the brown wire ICSP connector, or its pin 1. This amendment resolves any conflict of tensions that may arise between the Implementing Rules and the programming modeornand pic of 40 and 28 pin.

We see a turn demo 16F877A processor, it is of the classic supercar, remember to line up the line streep SV13 and SV14 right, this disable quartz 4Mhz passing the bus to the pins connected to the LED, or RB5 RB4 and how we can easily see with the patterns in the hand.

Supercar to Prot B - Micro-GT PIC Versatile IDE Movie

download movie dl test "supercar to PORTB" Micro-GT PIC versatile IDE

2x16 LCD Module characters

The module allows the management of a common LCD type HD44780 compatible module, interfaced with the 4-bit method.
It will show any warning messages, or show data or still bring the temperature detected by a sensor.
It can use two different models that differ from the display otherwise the PIN.

The Micro-GT versatile I.D.E. presents only the housing and PIN to link the display using one or more flat cables, to avoid the waste of resources because the use of the LCD is one of many possible features.

The jumper JP6 allows the backlight or power anode-cathode of the LED integrated (PIN 15 16 anodoe cathode side display), while streep the 3-terminal SV25 enables the connection of the first flat cable three terminals of the LCD and is the 5 volt power supply and regulation contrast.

With regard to three lines needed to monitor RS / RW / E was added to the connector SV4 three terminals. coinciding with the PIC 16F877A PORT D.

Warning: A ZIF socket 40 pin 3M is on ebay $ 0.99, equal to € 0.75, do not be fooled! Buy on ebay even if you have to wait 10 days. Shipping included, there costs less than 5 €.

The data lines however, will be taken in one of the "direct access" to the port with the freedom to decide (depending on the software developed for the PIC) the mode 4 or 8 bits.


Technical Documentation of the display

download the technical documentation of the display

In some models the row of pins is shown (in parallel), even on the underside of support Display PCB. Connecting to the one above or below it makes no difference, we use therefore the most convenient for the wiring.

Description
The crystal display liquid or LCD (Liquid Crystal Display English) connected to This form has 2 lines of 16 characters each. The LCD displays the most common commercially available, have interface designed by Hitachi that, over time, has become a standard Industrial also used by other manufacturers.

Function of various pins of the display

PIN

Name

Function

1

GND

Ground - Pin must be connected to the negative supply.

2

VDD

Power Supply - Pin to be connected to +5 V supply.

3

Vo

To this pin should enjoy a variable voltage from 0 to +5 V through a trimmer to adjust the display contrast.

4

RS

Register Select - This pin is a line with which it communicates to the display if you are sending on the data bus (lines DB0 to DB7) a command (RS = 0) or a data (RS = 1).

5

R / W

Read, Write - This pin is another line with which it communicates to if you send a display means to display data (R / W = 0) or read a display given by (R / W = 1).

6

E

Enable - This pin is a control line which can enable display and accept data and instructions from the data bus (E = 1).

7

DB0

Data bus line 0 - The lines to pass data between the processor and display.

8

DB1

Data Bus Line 1

9

DB2

Data Bus Line 2

10

DB3

Data Bus Line 3

11

DB4

Data Bus Line 4

12

DB5

Data Bus Line 5

13

DB6

Data Bus Line 6

14

DB7

Data Bus Line 7

15

A

Pin for connecting the backlight if any.

16

K

Pin for connecting the backlight if any.

Of the 16 pins if they use However, only 7

RS Register select signal
E Enable signal
R / W read / wrwite selection
DB4 Data bit 4
DB5 Data bit 5
DB6 Data bit 6
DB7 Data bit 7

The data lines, RS and E not are with eveand a pull-down resistor to ground to force the line when used. This was intended to maintain the compatibility with other applications such as digital I / O pin in the same. In most cases the system will work, but if need to add the three pulldown resistors there will be big problems to install the outside, or edge of the display. You can even use it in combination with SV16 line streep SV6 (see schema) to connect the three resistors then closed to the more near earth point.
The trimmer R55 connected to pin Vo, through the line streep SV25 To adjust the contrast of the LCD.

Module 7-segment display, 4 digit

The module allows the management of 4 digit common cathode mode multiplexer controllable, ie it will be necessary with the processor generating a BCD Nibble on the data bus and enabling the digit corresponding with the launch of a Bit on the bases of transistors BC337 used in saturation, which will ban the lighting of the digit correspondent.

particularly the seven-segment display and driver CD4511, also highlighted the deep switch cutting and 4 for BJT multiplex digit.

Warning: The PCB has the sequence from left to right dis3, dis2, dis1, dis4 for reasons of convenience routing.

download the documentation of the integrated CD4511

The IC CD4511 (equivalent to the TTL 74LS48 and LS248) takes care of the decoding of the four-bit BCD generated with the PIC. If we use the on-board connections, which enabled BUS using the dip switches S26 and in the case of a PIC16F877, you have the correspondence:

A -> RB7

B -> RB6

C -> RB5

D -> RB4

As you can see from this diagram signals are never floating even if the opening of the dip is 26 in fact brought to zero by the pulldown resistors.

Decimal points can be separately controlled or isolated by the dip 25. If we wanted to example, create a digital clock should only enable the dip 25 line number 2.

A good programming exercise would be to modify the software presented on this site on clock 24 hours in order to do so run on the PIC Micro-GT.

controls are: SV19 -> direct entry of BCD data, SV20 -> control of the multiplexer display (common cathode enables the driving transistor), SV21-> Control 4 decimal points on the display (isolated DIP 4 line S25.

Stepper motor control module step

The module allows control a stepper motor or two motors instead of DC with maximum current armature games to 2 Amps continuously. E 'provided protection against Current which must be handled in software by acquiring the signal This analogue resistant to the two schunt. The analog signals question shall be taken at 10 and jumpers must be reported with a flat cable. DIP S9 disables reading.

The chip is used known that the L298 will be powered by hand 5Volt processor and voltage suitable for engine power in the side. The free-wheeling diodes protect the lines extra hang him from breaking the current internal MOSFET.

The finished project

The following image we see the PCB complete with screen prints and tracks of power reinforced. Were enlarged mass of the tracks and all tracks affected by the passage of current supply of engines. They are very useful to the writing that identify the buttons and LEDs and their combined output pin of the PORT B, C, D.

Many of the jumpers were combined with a silkscreen that shows functionality but will always be useful to have on hand the legend included in the instruction manual to the correct setting. Retained in the following lines extract the manual.

List of components

R13-R14-R15-R16 = 10k
R21-R22-R23-R24 = 10k
R25-R26-R27-R28 = 10K
R29-R30-R31-R32 = 10K

An0-AN1-AN2-AN3, AN4-AN5-AN6-AN7 = 5K ALIGNED MULTI PIN

C3-C4 = 18pF
C13-14 = 22pF

Q5 = 20Mhz
Q = 4 MHz

R12 = 10k

IC3 = 7805 - 1A
IC5 = 7812 - 1A
D2-D3 = 1N4148
C10-C11-C1 = 100nF
1 bridge 1A
R51-R52-R53-R54 = 10K
R1-R2-R3-R4-R5-R6-R7 = 220
R17-R18-R19-R20 = 220
R8-R9-R10-R11 = 1K5
IC7 = TL082
R76-75 = 10K
INSTEAD OF R78 AND R77 ZENER 2.6V CATHODE WITH THE TERMINAL INVERTING The operational
R73-R74 = 4K7
R69-R70-R71-R72 = 1K8
Q9-Q10-Q11-Q12 = TIP122 DARLINGTON
D12-D13-D14-D15 = GI852 SCHOTTKY DIODES
D8-D9-D10-D11-D4-D5-D6-D7 = GI852 SCHOTTKY DIODES
IC6 = L298
R59-R60-R61-R62 = 1 OHM 1W
R63-R64-R65-R66-R67-R68 = 10K
IC4 = CD4049N
IC1 = CD4511
R57 = 10K LINEAR (TRIM)
R37 = 3K3
R40-R41 = 3K3
R55 = 10K LINEAR
C6-C7-C8-C5 = 1micro F electrolytic
IC2 MAX232 =
D1 = 1N4148
RN1-RN2 RN3-RESISTIVE NETWORKS = 8 + COMMON ELEMENTS 1 KOHM
TOT A STRIP OF MALE LINE
FB47-R42 = 47 OHM METAL FILM RESISTOR
R39 = FB220 = 220 OHM METAL FILM RESISTOR
JUMPER least twenty 2-POSITION
No. 17 BUTTONS REMOTE
N 26 LED RED 3mm
No. 4 GREEN LED 3mm
Q6 = BC547 NPN
Q7 BC557 = PNP
4 ELEMENTS 100 kOhm
R35-34 = 100 KOHM
R36 = 3K3
R33 = 10K
R38 = 100K
S12-S26-S11 DIP = 8-CHANNEL SWITCH
S25-S14 DIP = 4-CHANNEL SWITCH
S13 = 3 DIP SWITCH CHANNELS
S24-S10-S9 = 2-CHANNEL
4 7-segment display KATODO TOWN
3 16 PIN DIL
1 SOCKET 8 PIN
1 PORT DB9 FEMALE CANNON
6 SCREW TERMINAL 2 WAY

DOWNOLOAD excel file partsearch list of components (recommended)

download the txt file list of components

Controller supported

The following controller have been tested and are fully supported:

  • PIC10F200
  • PIC12C508, PIC12CE518
  • PIC12F629, PIC12F675
  • PIC16F54
  • PIC16F84A
  • PIC16F88
  • PIC16F870, PIC16F871, PIC16F872, PIC16F873A, PIC16F874
  • PIC16F876, PIC16F877
  • PIC16F627, PIC16F627A, PIC16F628, PIC16F628A
  • PIC16F648A, PIC16F630, PIC16F676
  • PIC18F2550
  • Other untested but compatible with the previous ones.

Configuration for the proper functioning of the modules

Swtich configuration of Micro_GT_PIC completed

Scheme Electric hand to identify each time the position of DIP and streep cited connectors to enable the various functions or divert the bus from a position to another card.

For example, the L298 chip that phelot 1 bipolar stepper motor or two motors D.C. (A maximum of 2 per roll) is enabled by closing the DIP A.

The DIP C enables the reading of analog feedback through shunt.

the DIP D allows hand signals to drive the bridges.

We see the features of the various connectors streep:

SV1 pull up down buttons S1-S4

SV2 pull up down buttons S5-S8

SV3 bus 4 lines of command L298

SV4 is IC connectorSP1 for in-circuit serial programming (Split with SV9 ovveroICS2 in parallel)

SV5 and SV6 Pass the clock to the PIC 16F876

SV7 pull up down buttons S15-S18

SV8 pull up down buttons S19-S22

SV9 IC is the connectorSP2 for in-circuit serial programming (Split with SV4 ovveroICS1 in parallel)

SV11/SV12 RS232 direct serial connection supervisor pc control  28 pin serial programming

SV13 and SV14 Pass the clock to the PIC 16F877, deviation signal clock / get I / O

SV15 Direct-board analog

SV16 Direct analog or leading to (switch to digital signals to analog)

SV17 Direct port B

SV18 Direct port D

SV19 BCD direct control B0 B3 led display

SV20 Direct access multiplexer LED display

SV21 Stepper control signal

SV22 Direct control RC 0-3

SV23 Direct control RC 4-7

SV24 RS / RW / EN for LCD or lines RE0, RE1, RE2 of the 16F877

SV25 Contrast adjustment

SV27 Checks port B control the graphic display

SV28 D0 D7 data to display graphic Glcd

SV29 Direct I / O input connect S15-S22

SV30 Direct I / O input connect S1-S8

We see the functionality of the screw connectors:

X1= Supply of the device, it's good both alternating and provided between 7 V and 24 V) polarity.

X2= Not present on the card.

X3= Stepper motor power supply phases (eg X3-1 -> +12 Volt While X3-2 -> GND)

X4= Stepper motor phases A and B in sequence

X5= Stepper motor stages C and D in sequence

X6= Motor D.C. (X6-1 induced positive terminal, negative terminal X6-2 induced)

X7= Motor D.C. power supply (X7 DC-DC motor, DC motor mass X7-2)

We see the functionality of the DIP switch:

S9 enable analog feedback from L298

S10 enable L298 (Separately for the two internal H-bridges)

S11 island to door allows entry of analog and digital

S13 onboard output enable (1-port D ,2-C ,3-port port B)

S12 PORT B ​​or tie the island of 16F877, when we open in SV29 available signals from S15 to S22

S14 4 L298 command line enable signal

S24 Enable bridge (If open the pulldown force commands to stop in both directions)

S25 enable single decimal point on 7 segment display

S26 single line BCD - 7 segment display controller enable

We see the features of the various jumpers:

JP1 island or spins the clock to OSC1 16F877

JP2 island or spins the clock OSC2 for 16F877

JP3 If you closed the door power Vss to pin 5 for 16F84A (Must be up to 4 and 5 SV2).

JP4 If you closed the door power Vdd to pin 14 for 16F84A (In case of error is not destructive).

JP5 One, connect with flat cable power bipolar 16F877 11-Vdd and 12-Vss or direct RC0, RC1 for 16F876

JP6 flat cable bipolar power LED backlit LCD display (1-Vdd, 2-Vss)

JP7 backlit graphic display Glcd

JP8 deviation of the clock signal (if closed door signal at PIN 13 - OSC1 for 16F877) is open if RC2-16F876

JP9 deviation of the clock signal (if closed door signal to the PIN 14 - OSC2 for 16F877) is open if RC3-16F876

JP10 Analog sense, is the analog feedback of the two bridges built sull'L298

NOTE: If we use 16F84A PINs are:

4 MCLR 6 13 RB0 RB7

5 OSC1-OSC2 VSS 16-15

14 VDD (JP4 close to power PIC16F84 and all the pin to pin compatible)

SV2 set mode pull-up (jumper right-aligned) come on P6 MCLR to become 16F84A

Programs application / demonstration

Will now be presented a series of well-fed programs programs written in C16 with the dual purpose of being planned and use the potential of Micro-GT versatile I.D.E.For each module on the card will be matched with more experience in order difficulties.

Using seven-segment display module

Exercise 1

View a count up / count-down controlled by two buttons on the least significant digit the seven-segment display of the Micro-GT versatile IDE

Solution:

Scheme to hand can be seen that the least significant digit of the display is enabled by saturation of the transistor Q4 driven by the line of least significant PORT B, which is the RB0 pin (No. 33 of the 40-pin PIC). this program will work for both PIC16F877 PIC16F876 for as long as you make the appropriate jumper setting relatively dovetailing of the clock osc1/osc2 their feet.

The number of display will be coded in BCD lines RB4, RB5, RB6, RB7.

To allow the transmission of these signals to the device (display) should act on DIP S26 enabling the channel 8 for the transistor place the common cathodes of the digit, and the lines representing the nibble 1,2,3,4 BCD.

  • Line 1   RB7 corresponds to the processor and also the bit at the decoder CD4511.
  • Line 2   RB6 corresponds to the processor, enables the bit B.
  • Line 3   RB5 corresponds to the processor, enables the bit C.
  • Line 4   RB4 corresponds to the processor, enable bit D

For safety disable all channels in the DIP S12 that prevents the arrival of erroneous signals from the button assembly from S15 to S22.

If we do not want have a bright echo command disable data channel 3 of the DIP S13.

We set the according to the logic control buttons pressed = 1, and inputs RA0 R01. To do this we must dispose of the two jumpers next to Streep that SV2 control buttons to S5 to S8.

Commands concerned will be S8 -> RA0 And S7 -> RA1

  • If the   16F877 processor chosen is the 20-MHz quartz Q5 is connected to   pins 13 and 14 simply by closing the jumper JP8 and JP9.
  • If the   16F876 processor chosen is the clock signal will be routed to the pin   9 and 10, to do this you must open jumpers JP8 and JP9, and   short SV5 (pins 1 and 2) and SV6 (pins 1 and 2).

E 'can perform the same exercise using a 18-pin PIC such as the 16F84.

In any case will be useful to produce an array of certification to be submitted to PORT B ​​as below.

Matrix generating nibble PORT B

RB0 RB1 RB2 RB3 RB4 RB5 RB6 RB7
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 1
1 0 0 0 0 0 1 0
1 0 0 0 0 0 1 1
1 0 0 0 0 1 0 0
1 0 0 0 0 1 0 1
1 0 0 0 0 1 1 0
1 0 0 0 0 1 1 1
1 0 0 0 1 0 0 0
1 0 0 0 1 0 0 1

To directly generate the PORT command that has the least significant bit to the right we must reverse the symmetrical matrix.
 

Matrix generating nibble PORT B ​​Direct

RB0 RB1 RB2 RB3 RB4 RB5 RB6 RB7
0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1
0 1 0 0 0 0 0 1
1 1 0 0 0 0 0 1
0 0 1 0 0 0 0 1
1 0 1 0 0 0 0 1
0 1 1 0 0 0 0 1
1 1 1 0 0 0 0 1
0 0 0 1 0 0 0 1
1 0 0 1 0 0 0 1

We develop the two software modules so as to maintain a more professional style of programming.

In a form setting.h preset called the internal registers of the microprocessor, while numeratore_up_Down.c insert a module called the main function "main", even agreed to run two modules of different settings that will be included as needed depending on the controller that we will choose.

//---------- Form setting16F84.h---------------

# Define UP RA0 / / a button that launches the count up

# Define DOWN RA1 / / Button 2 launches the count back

void settings (void) {

TRISA = 0b00011;

TRISB = 0b00000000;

PORTB = 0;

}

//--------- Form setting16F877-876.h

# Define UP RA0 / / a button that launches the count up

# Define DOWN RA1 / / Button 2 launches the count back

void settings (void) {

TRISA = 0b00011;

TRISB = 0b00000000;

Trisch = 0;

TRISD = 0;

TRIS = 0;

}

//--------------- Module numeratore_up_Down.c------------------

# Define XTAL_FREQ 4MHZ / / header is used in delay, Place a comment this line if using PIC16F876 or 877

# Define XTAL_FREQ 20MHZ/ / Put in this comment line if we use PIC16F84

# Include <pic.h> / / Make the compiler know the names of the internal registers of the PIC

# Include <delay.h> / / Function prototype delay

# Include <delay.c>

/ * __CONFIG (HS WDTDIS PWRTEN & & & Unprotect) * /

/ / Set cast for the 16F84

__CONFIG (HS & WDTDIS PWRTEN & & & BORDIS LVPDIS DUNPROT & & & WRTEN DEBUGDIS & Unprotect);

/ / Set merged if the 16F876 or 16F877

# Include "setting.h"  / / Setting form of external registers

void main (void) {

settings ();

while (1) {

if (UP == 1) {

DelayMs (100);

if (UP == 1) {

PORTB = 0b00000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b01000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b11000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b00100001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10100001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b01100001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10000111;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b00010001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10010001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

                                               }

if ((up == 0) & & (DOWN == 0)) {

                                               PORTB = 0b00000000; / / Clear all outputs including RB7 -> Q4 which turns off the display

                                                }

                        }

                    if (DOWN == 1) {

                               DelayMs (100);

if (DOWN == 1) {

PORTB = 0b10010001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b00010001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10000111;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b01100001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10100001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b00100001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b11000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b01000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b10000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

PORTB = 0b00000001;

DelayMs (255);

DelayMs (255);

DelayMs (255);

                                              }

if ((UP == 0) & & (DOWN == 0)) {PORTB = 0b00000000;} / / Off the display

} / / End of loop

} / / End of main program

Using Module L298 for stepper motor

The L298 default form is disconnected from the rest of the circuit so as not to affect the operation during the use of other modules. Also for default input of each bridge chip is brought to logic zero thanks to the on-baord of their respective pulldown resistors.

for module operation make the following settings

  • enable the two bridges inside H acting on S10 (every one of these channels enables a bridge inside)
  • link with 4-way flat cable to the desired port SV3 (SV17 Board - PORT B, lines Pin 0,1,2,3 or 33,34,35,36)
  • S13 enabling channel 3 (with flat cable which suggested above) will see the echo step-matrix LED on RB0 to RB3
  • Connect with flat cable with two conductors in SV16 JP10 to read the extra current analogue signal (enable S9)
  • connect the motor to the screw terminals bipolar X4-1 -> A, X4-2 -> B, X5-1 -> C, X5-2 -> D
  • Feed the engine with its own specific voltage at the terminals X3-1 Positive, and X3-2 mass (the power is independent while the positive mass is common).

Exercise

Acting a button (initially bistable) the stepper motor is put in clockwise rotation (clockwise or CW). Acting on a second button, the motor it rotates counter-clockwise (anti clock wise ACW). Lends attention to the commands antagonists, or the engine does not accept the command if it is yet the opposite feature. It uses the Micro-GT versatile I.D.E. After making the necessary connections and hardware settings.

Solution:

The settings Hardware should be performed, plans in hand, according to the list bulleted above. In doing so we can send four signals matrix full step (full step) to bits of PORT B.

/ / TOF led by Save As Micro-GT stepper1.c

/****************************************
* Micro-GT Versatile IDE *
* Form L298 *
* Drive stepper motor *
* Professor. Marco Gottardo *
* April 2010 *
****************************************/

/******** List of duties *********

CW RA0
ACW RA1
mot_A RB0
mot_B RB1
mot_C RB2
mot_D RB3

***************************************/
# Include <pic.h>
# Include <delay.h>
# Include "setting16F877.h"

Full_CW void () {
while (ruotaCW == 1) / / double equals to compare

{/ / Implement the full array of step 10,6,5,9

PORTB = 10;
DelayMs (200);
PORTB = 6;
DelayMs (200);
PORTB = 5;
DelayMs (200);
PORTB = 9;
DelayMs (200);
    }
}

Full_ACW void () {

while (ruotaACW == 1) / / double equals to compare

{/ / Implement the array of step Full reverse 9,5,6,10

PORTB = 9;
DelayMs (200);
PORTB = 5;
DelayMs (200);
PORTB = 6;
DelayMs (200);
PORTB = 10;
DelayMs (200);
        }
}

void main (void) {
settings ();
while (1) {

if (CW == 1) {

DelayMs (100) / / debounce

if (CW == 1) {
Full_CW ();
                    }
            }

if (ACW == 1) {

DelayMs (100) / / debounce

if (CW == 1) {
Full_ACW ();
                    }
            }
    }

}

/ / End of main module that contains the main function

Settings Tristan and logs the initialization of variables of I / O, as well as definitions of new names for the same are implemented in a form external program. the file will be saved and type header with the name setting16F877.h

Within this header file implement the function settings () fixing the buffer in the direction of pin I / O for the entire program execution.

/ / *************** Early form setting16F877.h ***************

CW # define RA0 / / Button 1, which motor rotates them forward
# Define ACW RA1 / / Button 2 engine that rotates them back

/ / Draws up the definitions of each stage
/ / I can not use them but they are compatible to future changes

# Define mot_A RB0 / / Phase A of the stepper motor
# Define mot_B RB0 / / Phase B of the stepper motor
# Define mot_C RB0 / / C phase stepper motor
# Define mot_D RB0 / / D phase stepper motor
 
void settings (void) {
TRISA = 0b00011;
TRISB = 0b00000000;
Trisch = 0;
TRISD = 0;
TRIS = 0;
}
 
/ / end of the form setting16F877.h

image see the following development environment MPLAB Microchip home where you compiled in ANSI C program.

Cow can we see the compilation is successful. If this does not happen the problem is resolved by placing the locations to find libraries delay.h delay.c that should be moved to the include directory of the compiler. Proceed elina files from project and replace after it is returned in the directory just indicated. The external module instead must be in the same folder funzone module containing the main (void).

In summary:  

  • create a folder inside documents and nominiamola Micro-GT stepper1
  • we create two file with notepad stepper1.c and setting16F877.h (Or Scarichiamoli and copy it in there using these two links).
  • make sure that libraries delay.h and delay.c be included on folder includes the compiler.
  • we follow the wizard of the project using project wizard (appointed project Micro_GT_stepper1)
  • compile acting on the red and black squares on the command bar of MPLAB.
  • if everything is place the system responds with **** Build Successful! *** as shown above, then we can go to the project folder to find the file Micro_GT stepper1.hex Finally, to revert to the memory of the PIC. This maneuver is writing note on the web with the word "flasc_assare" PIC.

you can download the entire project from this link packaged with the appropriate button MPLAB, but some paths may need to be adjusted in accordance with advancement of the compiler or version upgrades or software development.

Download the complete project for MPLAB

NOTE: This work (diagrams and board layout Micro-GT), is awarded to the terms License Creative Commons Attribution-ShareAlike 3.0 Italy

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