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Edzelf / ESP32-Radio

Internet radio based on ESP32, VS1053 and a TFT screen.
GNU General Public License v3.0
964 stars 227 forks source link

Suggestion: integrate bitluni's AM radio transmitter driver #227

Open bootrino opened 5 years ago

bootrino commented 5 years ago

bitluni wrote code to transmit AM radio from an ESP32 without any additional components at all.

http://bitluni.net/am-radio-transmitter/

Any chance you could inetgrate bitluni's driver into this project?

Edzelf commented 5 years ago

I don't think it's gonna work: 1 - The signal to modulate the carrier is not available in the radio. 2 - The ESP32 is used for handling the WiFi, the MP3 decoder and the display. That will result in interruptions of the modulation. 3 - It is not allowed to broadcast on the AM radio band. 4 - You may attach a FM transmitter to the output of the VS1053 for the same, if not better, results.

bootrino commented 5 years ago

Thanks for the update. That's a pity - bitluni's code works well but not being able to play mp3 or WAV is very limiting.

Can you explain more this comment please?

1 - The signal to modulate the carrier is not available in the radio.

Edzelf commented 5 years ago

The radio receives a compressed stream with MP3, AAC or other codec. This is decoded by the VS1053, not by the ESP32. You need an uncompressed stream to modulate a AM transmitter.