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...