Bluetooth 4 Relays Control Pro

Here is a simple Android Bluetooth Remote Control Project for 4 Relays / Device using 89c2051 Micro-controller and HC-05 Bluetooth Module. You can download circuit and hex file 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.