Use ESP32 as FM transmitter?

[RoundRobin]

Would it be possible to use the ESP32 PWM output pins as an FM transmitter as it was done with the Raspberry Pi? http://www.icrobotics.co.uk/wiki/index. ... ransmitter

[ESP_Angus]

It's not a supported use, obviously (due to RF regulatory issues, etc.) But it should be technically possible.

@cnlohr successfully used the ESP8266 I2S peripheral to broadcast analog TV:
https://www.youtube.com/watch?v=SSiRkpgwVKY

Between the ESP32 PWM hardware and also the similar but more feature-ful I2S peripheral, there should be a lot of possible high frequency pin-twiddling hacks.

[ESP_Sprite]

Also the RMT peripheral seems a likely candidate for doing weird RF stuff.

[RoundRobin]

Great, looks promising. Hadn't looked into the RMT before.

Another question from the great noob:

I need to play several small wav files simultaneously (8000 Hz, mono, 1 second duration), and originally I was thinking about using a multichannel SPI DAC. But would it be possible to use the PWM outputs instead since all GPIO pins have PWM capabilities?