2 layers124 × 102 mm
2 layers124 × 102 mm
Chergo
doesntfazer/Budgy27Split 34 key keyboard powered by a raspberry pi pico and QMK
- Size
- 124 × 102 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 42
- Nets
- 59
- Pads
- 359
- Tracks, vias
- 1,358, 154
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 15 Nov 2022
- Updated
- 5 Apr 2024
Overview
Chergo is an open-source printed circuit board by doesntfazer, from the doesntfazer/Budgy repository on GitHub. It is a 2-layer board of 124 × 102 mm with 42 parts on 59 nets, routed with 1,358 tracks and 154 vias.
It is built around the SN74LVC1T45DCK. Its parts include 17 diodes, 17 switches and 4 ICs. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
1README
Budgy-rev2/README.mdBudgy
Split 34 key keyboard powered by a raspberry pi pico and QMK
This keyboard is Diodeless.
DO NOT DOWNLOAD OR PRINT REV 2. I have yet to do any testing. But I noticed a major flaw with the current design. The power supply voltage for the SK6812MINI-E that I am planning to use is 5v (or +3.7~+5.5), and the logic input is 3.3v. I would just use the 3v3 out. But in testing the SK6812MINI-E will not light up under such low power.
I have added in a voltage divider using 10k + 30k resistor's in an attempt to fix this. This should provide Just enough power (3.75v) to the SK6812MINI-E supply voltage, and be withing the operating range (+-.5v) of the logic input. Although I believe that this fix might work, I don't think that this is the best solution to the problem.
Another issue is that the VBUS on a rp2040 is directly connected to the 5v usb pin. Some issues can come from this, one being that the power coming from usb is not always consistant. If it doesn't output exactly 5v-5.05v, It will likely either not light, or not be within operating range of the logic input.
I am going to put rev2 on the backburner for now. If anyone is interested in testing it out in it's current state let me know. But I don't know if I trust it.
Build guide coming soon.
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | KEYSW | keyswitches:SW_MX_reversible | K1, K2, K3, K4, K5, K6, K7, K8, K10, K11, K12, K13, K14, K15, K16, K17 +1 |
| 17 | YS-SK6812MINI-E | kbd:YS-SK6812MINI-E-reversible-fix | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED10, LED11, LED12, LED13, LED14, LED15, LED16, LED17 +1 |
| 2 | LOGO | imagefootprints:qmk25mm | G***, G*** |
| 2 | SN74LVC1T45DCK | Keebio-Parts:SOT-363_SC-70-6 | U3, U4 |
| 1 | LOGO | imagefootprints:BudgyHeadright | G*** |
| 1 | LOGO | imagefootprints:BudgyHeadleft | G*** |
| 1 | Pico | MCU_RaspberryPi_and_Boards:RPi_Pico_SMD_TH-REV2 | U1 |
| 1 | TRRS | Keebio-Parts:TRRS-PJ-320A-rev | U2 |
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Questions
How big is the Chergo PCB?
It measures 124 × 102 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chergo use?
42 parts, built around the SN74LVC1T45DCK. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Chergo KiCad files?
From the doesntfazer/Budgy repository on GitHub, at the commit this page was made from: the board is Budgy-rev2/Chergo.kicad_pcb and its schematic Budgy-rev1/Chergo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Chergo design in my own project?
Its repository states no licence, so its author keeps all rights: ask doesntfazer before reusing the design.