NodeMCU + I2C-controlled FM Transmitter + AP Mode + TRS Electret Microphone
= Remote Control Listening Device
Adafruit Stereo FM Transmitter with RDS/RBDS Breakout – Si4713 https://www.adafruit.com/product/1958
- Solder length of wire for antenna
- Wire up Si4713 breakout board to NodeMCU
Node Si4713 3V -> VIN GND -> GND D1 -> SDA D2 -> SCL
- Connect TRS electret mic to Si4714 TRS jack
- Upload firmware
- Connect to “hackerradio” AP broadcast by NodeMCU
- Open browser, navigate to 192.168.4.1
- Enter a frequency and click submit (For example 102.35MHz should be entered as 10235)
- Tune FM radio to same frequency
- Talk and listen