SI471x FM Transmitter i2c control application


Look at newer project, called FmStick. Its digital USB-FM Transmitter


This is application to control si471x FM transmitter IC

Hardware options:

  • i2c interface (through i2c-tiny-usb).
  • Up to 1W power output.
  • Analog or SPDIF audio input.

Software options:

  • sending RDS time every 5 seconds
  • telnet interface to update RDS and transmitter parameters
  • auto-detect chip firmware (supported RDS or not).


Block diagram:


Schematic diagram:






Source code avaliable here:  si471x.tar.gz

Schematics (by Eagle) and libraries: SI4711-pcb-sch_tar.gz