Unicorn
About the Unicorn PCB
Unicorn is an open source AVR/Arduino PCB design by HaCraFu, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 78.4 × 81 mm, with 22 components from 12 distinct parts.
Its main chip is the ATtiny85-20S, from the AVR/Arduino family. Other key parts include the Unicorn. By type, the board carries 8 diodes, 6 resistors, 2 ICs, 2 capacitors, 1 connector and 1 battery holder.
From the project
HaCraFu e.V. assembly kits
Main components on the Unicorn
Unicorn bill of materials (BOM)
22 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Unicorn | unicorn | U1 |
| 1 | ATtiny85-20S | SOIC-8W_5.3x5.3mm_P1.27mm-breiter | U2 |
| 1 | ICSP | PinHeader | J1 |
| 1 | Battery_Cell | Batteryholder | BT1 |
| 1 | SW_SPST | Switch_MSS22D18 | SW1 |
| 1 | USB_A | usb-PCB | USB1 |
| 6 | LED | 5mm_SMD-Pad | D1, D2, D3, D4, D5, D6 |
| 2 | 3.6 | Z-Diode Minimelf | D7, D8 |
| 1 | 0.1u | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 4.7u | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2 |
| 5 | 66.5 | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4, R6 |
| 1 | 1K | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5 |
Unicorn design files
The KiCad project lives in the HaCraFu/assembly-kits repository on GitHub; these links point at the commit this page was built from.
- Layoutunicorn/unicorn.kicad_pcb
- Schematicunicorn/unicorn.kicad_sch
Unicorn: common questions
What microcontroller does the Unicorn use?
The Unicorn is built around the ATtiny85-20S, from the AVR/Arduino family.
How big is the Unicorn PCB?
The Unicorn measures 78.4 × 81 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Unicorn?
22 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the Unicorn design files?
From the HaCraFu/assembly-kits repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Unicorn design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
Can I test firmware for the Unicorn 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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