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It’s a Walkie-Talkie based around the ESP32. It transmits audio using either UDP Broadcast or ESP-NOW.

We’ve made a Walkie-Talkie using the ESP32.

Audio data is transmitted over either UDP broadcast or ESP-NOW. So the Walkie-Talkie will even work without a WiFi network!

I’ve based it around an I2S microphone and an I2S Amplifier - but it will work equally well with analogue microphones and headphones with a small change to the code.”

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