Notes on RF-0417C

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.