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: And you can help support the channel by using my referral link: for other PCBs. If you like ESP32 audio videos - I've got a complete set on this playlist: I'm using my own microphone board (available on Tindie: ) 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: 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: For this project I've 3D printed a case - you can access the Fusion 360 project here: You can access the PCB schematic here: Thanks for watching - there are more videos coming - so don't forget to subscribe :) Components: TinyPico: Microphone: or Amplifier: Speakers: ---- Patreon: ko-fi: