MCU Board
About the MCU Board
MCU Board is an open source AVR/Arduino PCB design by Aurekana, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 39 × 39 mm, with 28 components from 19 distinct parts.
Its main chip is the ATtiny85-20SU, from the AVR/Arduino family. Other key parts include the MIC5219-5.0YM5. By type, the board carries 14 connectors, 5 resistors, 4 diodes, 3 capacitors and 2 ICs.
Main components on the MCU Board
MCU Board bill of materials (BOM)
28 components, 19 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATtiny85-20SU | SOIJ-8_5.3x5.3mm_P1.27mm | U2 |
| 1 | MIC5219-5.0YM5 | SOT-23-5 | U3 |
| 4 | Conn_01x01 | SolderWire-2sqmm_1x01_D2mm_OD3.9mm | J1, J2, J7, J8 |
| 1 | Conn_01x01 | PinHeader_1x01_P2.54mm_Vertical | J3 |
| 2 | Conn_01x04 | PinHeader_1x04_P1.27mm_Vertical | J4, J16 |
| 1 | USB_B_Micro | USB_Mini-B_Tensility_54-00023_Vertical | J5 |
| 1 | Conn_01x02 | PinHeader_1x02_P1.00mm_Vertical | J6 |
| 4 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J18, J19, J21, J22 |
| 1 | Conn_01x04 | Molex_PicoBlade_53047-0410_1x04_P1.25mm_Vertical | J20 |
| 1 | LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 2 | 3.6V | D_SOD-323_HandSoldering | D2, D3 |
| 1 | D_Schottky | D_SOD-123 | D4 |
| 1 | 10uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 2.2uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 500 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | 470 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 1.5K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5 |
| 2 | 68 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R7 |
MCU Board design files
The KiCad project lives in the Aurekana/SwbusMk2 repository on GitHub; these links point at the commit this page was built from.
MCU Board: common questions
What microcontroller does the MCU Board use?
The MCU Board is built around the ATtiny85-20SU, from the AVR/Arduino family.
How big is the MCU Board?
The MCU Board measures 39 × 39 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MCU Board?
28 components, from 19 distinct parts. The full bill of materials is listed on this page.
Where can I download the MCU Board design files?
From the Aurekana/SwbusMk2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the MCU Board design in my own project?
Yes, under the terms of its GPL-3.0 license, which Aurekana chose for the repository.
Can I test firmware for the MCU 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.
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