Developer's DescriptionBy Hobbyprojects.comHere is a simple Android Bluetooth Remote Control Project for 2 Relays / Device using 89c2051 Micro-controller and HC-05 Bluetooth Module.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".