For the ~3 other #Arduino folks on the planet trying to solve the same problem I am: if you're desperately trying to find a 3.3V version of a #ProMicro with USB type C, Sparkfun make one with a Raspberry #PiPico RP2350 on board - much faster chip than an Atmel 32U4, runs at 3.3 volts, and no more expensive, plus there's the usual exciting range of faithful and creative clones on AliExpress.
The RP2040 also runs at 3V3 but is tolerant of 5V, for those weird in-between projects. #electronics
I am slowly getting better at soldering, 4 out of 7 successful #MechanicalKeyboard PCBs now - all three of my diode-free #GraphTheory wired keyboard PCB designs have worked (eventually) ⌨️🎊
1️⃣ #RaspberryPiPico #RP2040 ‘Gamma Omega TC36K’ (USB only) http://astrobeano.blogspot.com/2025/08/my-first-self-built-computer-keyboard.html
2️⃣ #ProMicro #nRF52840 BLE ‘Gamma Omega Hesse’ https://astrobeano.blogspot.com/2025/10/hesse-diode-free-bluetooth-keyboard.html
3️⃣ #SeeedStudio #Xiao #SplitKeyboard BLE split Forager ‘Acid’ http://astrobeano.blogspot.com/2025/10/partial-heawood-forager-keyboard.html
My current success rate with #MechanicalKeyboard PCB soldering is currently only 2 out of 5, well 40% is a pass mark - just.
The #RaspberryPiPico #RP2040 ‘Gamma Omega TC36K’ board worked (an easy build, could probably have socketed it). 💚
One success, one failure with #SeeedStudio #Xiao BLE castellated in Forager ‘Acid’ PCB (some fiddly back pads). 🧡
Two failures with #ProMicro #nRF52840 BLE in ‘Gamma Omega Hesse’ board attempting faux-castellation💔
Just as well custom PCBs are fabricated in batches of five - waiting on spare parts to try again - #LearningByDoing or #LearningByFailing ?
If my first wireless Bluetooth #MechanicalKeyboard proves a little battery hungry - and the #ZMK Discord channel suggests the #nRF52840 #ProMicro controller I plan on using can be - there’s an easy fix: Buy a bigger battery! 🪫
In hindsight I was over cautious when I ordered the 300mAh LP602030 battery BEFORE finalising the design, and eked out a few more millimetres for it 😢
Design is here: https://github.com/unspecworks/gamma-omega/tree/main/hesse
#Stromverbrauch und #DeepSleep des #nRF52840 #ProMicro/#SuperMini Board (nice!nano kompatibel) vs. ESP32 und andere
https://www.youtube.com/watch?v=CHgmXYLKigI
https://www.youtube.com/watch?v=xd1tplxSs20
#nRF #Nordic #Schaltung #Elektronik #Maker #DIY #Mikrocontroller #Anleitung #Tutorial #DevBoard #PlatformIO #Arduino #Programmierung #AliExpress #Stromverbrauch #Messung #Vergleich #ESP32 #Arduino #Raspberry #Pi #Pico
Vorstellung des RF52840 ProMicro Board (nice!nano kompatibel)
--> https://cool-web.de/nrf/nrf52840-promicro-nicenano-board-platformio-vorstellung.htm
#nRF #Nordic #nRF52840 #Schaltung #Elektronik #Maker #DIY #Mikrocontroller #Anleitung #Tutorial #ProMicro #NiceNano #DevBoard #PlatformIO #Arduino #Programmierung #AliExpress
自作キーボードキットをUSB-C化したら1mmに泣いた話 - Quick17 #ProMicro - Qiita https://qiita.com/fumigoro/items/5e1c2273a638e350f530
> 20枚入りなので1袋で十分なのに2袋買ってしまいました。これは算数ができなくても理系の修士号を取得できる可能性があることを示唆しています。
57だ
Ooh, my delivery of super mini nrf52840 have arrived. Look at this beauty next to an o/g nice!nano
It can do all the same at 2/3 of the footprint and 1/4 of the price. Plus it has a ceramic Bluetooth antenna so you’d never see BLE dropouts ever again!
Tim 🎮
Ölbaum
Peter Cock
Doc Cool
ゆらのふ
Kai, sounds like the sky
Brennan Stehling