This week we are completely focused on a Android application development. We have successfully connected the Bluetooth to the Arduino board and tested the communication. All the Bluetooth connection is working well and the data was successfully received. But, we ran into a problem immediately when testing it with the heart beat sensor. When ever we connected the Bluetooth module to the circuit we noticed unwanted signal outputted by the circuit. As shown in the image below this signal was consistent and regular when the sensor was idle.
We were suggested that the problem might have been because of bad ground in the circuit, but that didn't solve our problem either. We have currently decided to use separate power supply for the Bluetooth module and the Arduino board.
