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Home > Electronics Tutorials > Electronics Engineering Hobby Projects > Bluetooth Device Control > 89c2051 Microcontroller and HC-05 Bluetooth Android Project for 4 relays.
Android Controlled Projects
using 8051 Micro-controller and Bluetooth

Simple Android Bluetooth Remote Control Project for 4 Relays using 89c2051 Microcontroller
and HC-05 Bluetooth Module

Here is a simple project to turn ON/OFF four relays using Bluetooth Module HC-05 & 89c2051 Microcontroller with your Android phone device.

Circuit Diagram of Android Controlled 4 Relays using 892051 and HC-05 Bluetooth Module

Circuit diagram of Android based remote control for 4 relays
using 89C2051 and HC-05 Bluetooth Module

Download HEX File
(To save on your PC, right click on file choose "Save link as...")

HC-05 Bluetooth Module

For more detail on HC-05 Bluetooth module click here
 

Here is an another circuit shown in which the HC-05 Bluetooth module has a onboard 3.3V. regulator.

 

Android based remote control for four relays using 89C2051 and HC-05 Bluetooth Module  Android based remote control for 2  relays using 89C2051 and HC-05 Bluetooth Module

You can install FREE App on Google Play or can download by clicking on direct link here.

App Instructions:

1. First make sure your HC-05 Bluetooth Module is paired with your mobile. The default password for pairing is "1234" or "0000". Check the manual of Bluetooth module.

2. Click on Select Device to select paired Bluetooth module.

3. When you press ON button for Device 1 it sends the data "A" to Bluetooth Module connected with the circuit. Microcontroller turns ON the Device 1 relay when it detects "A"

4. When you press OFF button for Device 1 it sends the data "a" to Bluetooth Module connected with the circuit. Microcontroller turns OFF the Device 1 relay when it detects "a".

5. When you press ON button for Device 2 it sends the data "B" to Bluetooth Module connected with the circuit. Microcontroller turns ON the Device 2 relay when it detects "B".

6. When you press OFF button for Device 2 it sends the data "b" to Bluetooth Module connected with the circuit. Microcontroller turns OFF the Device 2 relay when it detects "b".

7. When you press ON button for Device 3 it sends the data "C" to Bluetooth Module connected with the circuit. Microcontroller turns ON the Device 3 relay when it detects "C".

8. When you press OFF button for Device 3 it sends the data "c" to Bluetooth Module connected with the circuit. Microcontroller turns OFF the Device 3 relay when it detects "c".

9. When you press ON button for Device 4 it sends the data "D" to Bluetooth Module connected with the circuit. Microcontroller turns ON the Device 4 relay when it detects "D".

10. When you press OFF button for Device 4 it sends the data "d" to Bluetooth Module connected with the circuit. Microcontroller turns OFF the Device 4 relay when it detects "d".

11. Click on Disconnect to disconnect paired Bluetooth module.


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