Some notes on using the popular Bluetooth serial module RF-0417C:
- When sending AT commands, do not include \r\n either together or singly.
- It appears to be happy to receive 5V inputs to TX.
- It is not happy to receive 5V to Vcc.
- If you connect a LED, it blinks when unpaired, blinks slightly faster when paired, and becomes solid when a serial connection is established.
- It works just fine with the SoftwareSerial library.