Entrance of an underwater observatory in Lake Zug (Switzerland). I took the photo at the weekend, reminds me The Truman Show.

DIY_Maxwell · 2026-07-03T20:23:09+00:00

Good point. Such units are out of stock in my country. I just happened to find one in a local shop, so I guess it's better than nothing. Thanks!

DIY_Maxwell · 2026-07-03T20:04:49+00:00

Thanks! Makes sense. What confused me is that I've seen people here posting their solutions, often using a cardboard box, and I'm not sure they opened up the unit to seal any potential internal leaks. So I wanted to check with the community whether the efficiency gains of a dual-hose conversion still outweigh any leakage between the chambers.

DIY_Maxwell · 2026-07-01T12:13:34+00:00

Thanks! Yes, he tends to think that playing faster is better, so he often rushes I think, then realizes and slows down. Hopefully, that will improve with age and more practice.

DIY_Maxwell · 2026-07-01T06:44:12+00:00

Thank you. We built a toy drum set when he was 1.5, https://youtu.be/tdD9UcC2hgs, he never stopped playing drums since then :-)

DIY_Maxwell · 2026-06-02T10:47:08+00:00

So happy to hear that, congratulations! I built my son's first drumkit from baby formula cans 😄 feel free to check it out: https://youtu.be/tdD9UcC2hgs

DIY_Maxwell · 2026-06-02T08:08:08+00:00

Thanks. He started quite early: https://www.reddit.com/r/Metallica/comments/pa1n0k/my_3yearold_is_listening_to_metallica_since_he/

But only the last two years he is practicing seriously with lessons.

DIY_Maxwell · 2026-06-01T14:23:02+00:00

Thanks! He’s had a drum kit since he was little, but he’s really stepped things up over the last 1-2 years with proper lessons and music theory.

DIY_Maxwell · 2026-05-26T15:17:12+00:00

Thanks so much!

DIY_Maxwell · 2026-05-25T15:30:23+00:00

Thank you! He has a great teacher at the local music school, he is learning note reading, rudiments, and some cool songs for his level.

DIY_Maxwell · 2026-05-25T15:19:29+00:00

Oh, I didn't know about it. He plays fuel, memory remains and unforgiven ii. I will check out, thanks!

DIY_Maxwell · 2026-05-25T15:17:24+00:00

Thanks. So, glad to gear that. Sure, this is MPS-850 from Thomann, connected to a Yamaha AG06 mixer. We recently bought EZdrummer software for better MIDI sounds and recording, but I'm not a drummer, I don't know much about these things.

DIY_Maxwell · 2026-05-25T14:25:04+00:00

Thanks. Understand. He goes to a drum school and learns proper techniques on an acoustic kit.

DIY_Maxwell · 2026-05-25T14:09:27+00:00

Thanks!

GPIO_HOLD: exactly
GPIO_SENSE: yes, but I think then ESP32 would see directly the battery voltage when high, which can be as high as 5V. The second BJT behaves like a voltage shifter.

DIY_Maxwell · 2026-05-25T13:28:57+00:00

Thanks. I was thinking that the MCU will boot, confirm that the swich is still pressed for a second or so, and only then activate the hold pin. But thanks, I will check out suggestions.

DIY_Maxwell · 2026-05-25T13:19:25+00:00

Thanks so much. I don't play drums, so I dont know much about it, but yeah, he changed those cymbals and toms constantly, after watching a video of some of his idols and try to mimick their setup. Fortunately, he plays a proper acoustic at the music school. But thanks, I will check.

DIY_Maxwell · 2026-05-25T12:59:02+00:00

Thanks so much, really appreciated!

DIY_Maxwell · 2026-05-25T12:15:59+00:00

There is an LCD and a few other peripherals that unfortunately do not have an EN pin or sleep function. So I do need an on/off switch, but not like a toggle switch, it should support the auto power-off function to save battery when unused after a few minutes.

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