ESP32 Walkie-Talkie: DIY Audio Magic

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!

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.

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[photopicker]

I appreciate your ESP32 project demonstrations and explanations here on YT. 20 years ago this type of prototype development required $$$ and a team. Today is available to anyone willing to spend the time.

[bryndelltorio]

Awesome project!

I took the hardware modified it a bit to build a public address system. This is only possible because of this project.

Thank you for sharing your projects! Make some more. You're awesome!

[VinodPatel-ufpi]

Thank you for the amazing work. I used this on ESP32-C3, had to change the GPIO pins and it worked like a charm.

[berniegrant]

Cool project. I am going to modify this and others that I found to make a smaller walkie-talkie set. Thanks for the tutorial, it was quite interesting.

[njh]

Love this idea! Really cool!

A common thing on Wifi is seeing packets repeated.
Using RTP header on top of UDP could be a way of detecting out-of-order/missing/repeated packets.

[derrick_builds]

Who doesent like a cool little walkie-talkie project. Good work.

[Dazza_Doo]

Impressive for a audio data packet - the sound quality is really good

[SteveWrightNZ]

Cool, ok, now we need a repeater pair of them running full duplex for the local hilltop...

[csongorvarga]

This is a very cool project. I was thinking about building a simple intercom in the house and this just fits perfectly. Broadcast just makes it easy, I don't have to worry about much at all. I remember seeing lot of ESP32 development board for mic and speaker output, those could be readily available hardware for this project.

[xPsIXx]

Fantastic. This could be awesome for me with a directional antenna. This brings an idea to mind, two esp's transmitting their GPS location so that each of the esp's points to the other esp.

[JasonWho]

Love that you implemented ESP-NOW! I’m very impatient for it to become more accessible and easier to use, added to ESP-Home too 🙏🏼. Ideas:
- voice detection to automatically open the mic maybe using an audio level sensor
- home intercom system would be cool using a 110/220->3.3V step down at/in a light switch and/or front door communication
- my mind is wandering into how could this be used with an Alexa??
- I mean… a toy or for real: an audio spying device
- pest detection using a high sensitivity
- okay, I’m probably going this far because of the ESP-NOW ability… great project!

[dlcy]

awesome work - and a special thanx 2 u 4 sharing everything!

[StormBurnX]

I remember the ESP 8266 first releasing and being heralded as a 'wireless serial cable' essentially, so I picked up a pair to try and make a wireless audio cable. The built-in ADCs were so absolutely garbage that a quick 30 dollar project soon breached triple-digit prices and I realized why there wasn't anything on the market for lossless, latency-free short-range audio transmission that didn't already cost hundreds of dollars... with the ESP 32 series being significantly improved, I can't wait to see another generation or two from now and the possibilities with those :)

[redakouacem]

I have done it and it works great even without noise: the down sides 1. it deliver voice a little late. 2. it works only for few seconds and than no voice transmitted again, maybe i need to use powerfull power supply since i'm using the Tel charger only.

[eide]

Great project! Very cool that you utilized ESP-NOW!

[niels-olekuhl]

Have you considered using an audio Codec / compression to achieve higher quality / smaller packet sizes? I think SBC is what bluetooth uses. Not sure how easy it would be to implement.

[nickparr]

Extremely ambitious, although 3W audio amplification is a bit extreme. Very good video, well documented and you have every reason to be proud.

As I'm being trolled, I apologise for disabling notifications

[bloodyspirit]

Thank you for sharing! I was trying to find a way to connect my PC and Radio for some wireless FT8 and this seems like a great start. Look forward to checking out your other videos.

[RaminAssadollahi]

Love the explanations, great work! Enjoyed the video.

[binitshah]

This is super cool! Did I see Manim doing the latency calculations? Great work!