You can use the source code below for testing the Bluetooth module. ![]() If you use a Bluetooth module that only accept 3.3V, you will need to use voltage divider or level-translator between Arduino and the Bluetooth module. Remarks: the SPP-CA Bluetooth serial module we use is 3~6V tolerated. ![]() The USB plug in the figure below is just for power supply (DC 5V), and it has nothing to do with the communication. The Bluetooth serial module has 4 pins on board so it could be plugged into a breadboard. You can wire your Bluetooth serial module and your Arduino like this (we use Arduino Nano as example). Wiring Bluetooth Serial Module and Arduino
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