Here is a simple Android Bluetooth Remote Control Project for 2 Relays / Device using 89c2051 Micro-controller and HC-05 Bluetooth Module.
You can download circuit and hex file here http://www.hobbyprojects.com/bluetooth-device-control/
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. When you press ON button for Device 1 it sends the data "A" to Bluetooth Module connected with a circuit. Microcontroller turns ON the Device 1 relay when it detects "A".
3. When you press OFF button for Device 1 it sends the data "a" to Bluetooth Module connected with a circuit. Microcontroller turns OFF the Device 1 relay when it detects "a".
4. When you press ON button for Device 2 it sends the data "B" to Bluetooth Module connected with a circuit. Microcontroller turns ON the Device 2 relay when it detects "B".
5. When you press OFF button for Device 2 it sends the data "b" to Bluetooth Module connected with a circuit. Microcontroller turns OFF the Device 2 relay when it detects "b".
Updated on
Mar 16, 2017
Communication
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Ratings and reviews
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2.4
481 reviews
5
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1
Mike Keller
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August 28, 2021
EXCELLENT; I was able to connect 2 Bluetooth devices at same time even with WiFi off!! Thank you, thank you, thank you!!!
30 people found this review helpful
Benjamin Langub Robin
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August 16, 2021
Doesn't work on xiaomi redmi note 9s.....still need to update and upgrade for consumers good ratings....btw wish you more creative ideas and solutions
16 people found this review helpful
Jman Rowe
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September 7, 2022
It works great for one speaker to call on an the other to play music an one will wile your talking on the other