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!

The custom PCBs I’ve had made up were manufactured by PCBWay and as always they’ve done a really great job. You can order the boards directly from PCBWay here: https://www.pcbway.com/project/shareproject/ESP32_Audio_Board_For_Walkie_Talkie_v2.html

And you can help support the channel by using my referral link: https://www.pcbway.com/setinvite.aspx?inviteid=403566 for other PCBs.

If you like ESP32 audio videos - I’ve got a complete set on this playlist: https://www.youtube.com/playlist?list=PL5vDt5AALlRfGVUv2x7riDMIOX34udtKD

I’m using my own microphone board (available on Tindie: https://www.tindie.com/products/21519/) but the code will work equally well with any I2S microphone (e.g. the INMP441) and you can easily modify it to use the built-in ADC for analogue microphones.

For output, I’m using an I2S amplifier breakout board which I’m using the drive a 4ohm speaker. Once again, you can modify the code to use the built-in DAC for output which will let you use headphones or an analogue amplifier board.

As always, the code is on GitHub: https://github.com/atomic14/esp32-walkie-talkie

I’ve got a great series of videos on ESP32 Audio which are a great resource for anyone who wants to learn more about audio on the ESP32 which you can find here: https://www.youtube.com/playlist?list=PL5vDt5AALlRfGVUv2x7riDMIOX34udtKD

For this project I’ve 3D printed a case - you can access the Fusion 360 project here: https://a360.co/2PXgAUS

You can access the PCB schematic here: https://easyeda.com/chris_9044/esp32-walkie-talkie

Thanks for watching - there are more videos coming - so don’t forget to subscribe :)


TinyPico: https://amzn.to/3e525YR Microphone: https://www.tindie.com/products/21519/ or https://amzn.to/3e2oIgy Amplifier: https://amzn.to/3xC0yRF Speakers: https://amzn.to/3xzRkp2

Patreon: https://www.patreon.com/atomic14 ko-fi: https://ko-fi.com/atomic14