Checking the HC06 Bluetooth Connections to a Smart Phone

To check that the HC06 Bluetooth interface is working correctly, power has been applied ()V and 5V) and the Rx pin connected directly to the Tx pin. In this way anything that is received will be re-transmitted immediately. The Android smart phone is running an App called BlueTerm (there are several similar ones so it is important to get the correct one.). An alternative which also seems to work is BlueTerm 2. This App is just a dumb terminal and displays any text received and transmits any character pressed on the keyboard. Some Android phones such as this one, require the Bluetooth device to be paired before it can be used with this App, some allow pairing within the App. Once Connect has been selected the available Bluetooth devices are listed, in this case, only one, showing the name and MAC address. Selecting the device soon connects. Then anything typed on the keyboard is transmitted to the HC06, immediately re-transmitted back and appears on the screen.