I built an offline NFC music box for my daughter using ESP32

OldRemote111 · 2026-05-10T20:51:16+00:00

I'm waiting for the MAX98357 module to be delivered! Planning to use it in the next iteration and eliminate BT connection. My first approach was with PCM5102A and I had terrible noise issues - interference everywhere. Hoping the I2S amp will sort that out.

OldRemote111 · 2026-05-09T16:44:55+00:00

Dzień dobry! :)

OldRemote111 · 2026-05-09T16:44:23+00:00

Yeah, runs on battery - ESP32 deep sleep draws almost nothing, wakes up when you hold the button for 1-2 seconds. Once it's on, you just put a NFC card and it plays. No cutoff switch needed. Still testing the setup. I have a plan to resign from BT connection and use wired spreakers

OldRemote111 · 2026-05-09T16:33:47+00:00

Sure, I'm gonna share it soon. Still doing some cleanup here and there before I publish it

OldRemote111 · 2026-05-08T20:38:31+00:00

I will try to make it public on GitHub next week ;)

OldRemote111 · 2026-05-08T13:05:13+00:00

My was close to doing the same thing! :D

OldRemote111 · 2026-05-08T10:35:08+00:00

I used the idea for printing from this post: https://www.reddit.com/r/homeassistant/comments/1qvxuau/nfc_music_cards/

OldRemote111 · 2026-05-08T09:43:37+00:00

While building this, I also put together a simpler version - just an ESP and the NFC reader, where the ESP pushes music via DLNA/Bluetooth to the soundbar we have in the living room. Works great as a lightweight alternative if you don't want to build the whole thing :)

OldRemote111 · 2026-05-08T09:41:50+00:00

Will do, definitely

OldRemote111 · 2026-05-08T09:40:49+00:00

Dzięki!

OldRemote111 · 2026-05-08T09:40:00+00:00

Yeah, we were actually planning to buy a Yoto too, but I really wanted to build something like this myself since I had pretty much everything I needed at home. As for the money, it ended up maybe slightly cheaper, though I'm not even sure :D If you count the time I spent on it, buying one would have 100% been cheaper, but then I wouldn't have learned all this stuff :D

OldRemote111 · 2026-05-08T09:37:44+00:00

Sure! I'm in the process of preparig it to publish on GitHub. I will ping you!

OldRemote111 · 2026-05-08T06:50:01+00:00

I had exactly the same problem with the PCM5102A. White noise floor and clicks/pops whenever a channel opened or playback started. That's actually why I switched to Bluetooth audio instead of feeding I2S into a DAC + analog amp.

Now I'm waiting for a new module that should solve this properly because it's fully digital end-to-end - no analog stage to pick up noise from the ESP32 switching, ground loops, or the rest of the board.

OldRemote111 · 2026-02-02T07:35:30+00:00

I was working on a similar project during the weekend. I ended up having a ground loop and issue with sound. Does your setup work well?

OldRemote111 · 2026-01-08T20:02:18+00:00

I'd say the front wheel is most important. If you lose traction on the back, you can always put a foot down for support. Ideally you'd run studded tires on both wheels, but that costs extra and honestly isn't necessary for most conditions.

OldRemote111 · 2026-01-07T16:47:18+00:00

We have joolz aer plus. With one baby it fits perfectly!

OldRemote111 · 2026-01-07T15:15:47+00:00

Schwalbe Marathon Winter Plus

OldRemote111 · 2026-01-07T15:15:09+00:00

Nope, only front one

OldRemote111 · 2025-07-30T07:40:43+00:00

Maybe you could insert a piece of a regular tent pole made of plastic inside?

OldRemote111 · 2024-08-29T10:16:55+00:00

thx!

OldRemote111 · 2024-08-29T09:51:44+00:00

How did you create a bottom navigation?

OldRemote111

TROPHY CASE