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Bemini atmel mu

ianklug·bemini·bemini-atmel-mu/bemini-atmel-mu.kicad_pcb

Top view of the Bemini atmel mu PCB
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Bemini atmel mu is an open source AVR/Arduino PCB design by ianklug: a 2-layer, 200 × 65 mm board with 43 components (17 distinct parts). It is built around the C45874. Filed under keyboards.

A miniature mechanical keyboard controller with a rotary encoder for staggered-key rhythm games.

Special thanks to Sebastiaan Swinkels for technical assistance.

Please clone this repository using the --recurse-submodules flag. Some of the required symbol and footprint libraries will not be included otherwise.

Please note that the RP2040 models are functional at a hardware level, but software is incomplete.

The 2.x versions (bemini-rp) use the RP2040 MCU, and require different firmware from the 1.x versions. They also include a few new features and refinements over the 1.x models, including M2 mounting holes and an RGB indicator LED.

Bemini atmel mu, from the project README
From the project README

Built around

C45874

Parts list

43 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C45874
ATmega32U4-MU
U1
1
C13738
16MHz
X1
1
USB_C_Receptacle_USB2.0
J1
1
C261942
500mA
F1
13
MX-NoLED
K1, K2, K3, K4, K5, K6, K7, K8 +5
9
MX-NoLED
KA1, KA2, KA3, KA4, KA5, KA6, KA7, KA8 +1
1
Rotary_Encoder
RE1
1
C318884
SW_Push
S1
1
C1538
4.7nF
C1
1
C52923
1uF
C2
3
C1525
0.1uF
C3, C4, C5
1
C15525
10uF
C6
2
C1555
22pF
C7, C8
1
C26083
1M
R1
2
C25905
5.1k
R2, R3
2
C25092
22
R4, R5
2
C25744
10k
R6, R7

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