Mu board
About the Mu board
Mu board is an open source AVR/Arduino PCB design by ahtn, published on GitHub. It is a 2-layer board measuring 23.1 × 33 mm, with 20 components from 15 distinct parts.
Its main chip is the ATXMEGA32A4U-MH, from the AVR/Arduino family. Other key parts include the 576-2790-1 and nRF24L01_module. By type, the board carries 6 capacitors, 5 connectors, 5 resistors, 3 ICs and 1 diode.
It belongs with the keyboards designs in this gallery.
Main components on the Mu board
Mu board bill of materials (BOM)
20 components, 15 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 576-2790-1 MIC5216-3.3BM5 | SOT-23-5 | U1 |
| 1 | ATXMEGA32A4U-MH ATXMEGA-A4U-EPAD | QFN-44-1EP_7x7mm_Pitch0.5mm_Alt_Silk | U2 |
| 1 | nRF24L01_module | NRF24L01-Module-SMD | U3 |
| 1 | USB_C_Receptacle | USB_TypeC_U31F-24SNA0201 | J1 |
| 1 | Conn_01x11 | PinHeader_1x12_P2.54mm_Vertical | J2 |
| 1 | Conn_01x08 | PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | Conn_01x13 | PinHeader_1x12_P2.54mm_Vertical | J4 |
| 1 | Conn_01x06 | PinHeader_1x08_P2.54mm_Vertical | J5 |
| 1 | BAT54C-FDI D_Schottky_x2_KCom_AAK | SOT-23 | D1 |
| 1 | 1UF 1uF | C_0402_1005Metric | C1 |
| 1 | 10UF 10uF | C_0805_2012Metric | C2 |
| 4 | 0.1UF 0.1uF | C_0402_1005Metric | C3, C4, C5, C6 |
| 2 | 5.1K 5.1k | R_0402_1005Metric | R1, R2 |
| 2 | 100K 100k | R_0402_1005Metric | R3, R4 |
| 1 | 10K 10k | R_0402_1005Metric | R5 |
Mu board design files
The KiCad project lives in the ahtn/keyboard_pcb repository on GitHub; these links point at the commit this page was built from.
Mu board: common questions
What microcontroller does the Mu board use?
The Mu board is built around the ATXMEGA32A4U-MH, from the AVR/Arduino family.
How big is the Mu board?
The Mu board measures 23.1 × 33 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mu board?
20 components, from 15 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Mu board design files?
From the ahtn/keyboard_pcb repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Mu board design in my own project?
The repository has no license, so all rights stay with ahtn. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Mu board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
More boards in keyboard_pcb
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NRF24L01+ module
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AVR/ArduinoKeyplus mini
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Silicon LabsOne key
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Silicon Labs2key
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