Digital protection amulet
akornsys-rdi·digital-protection-amulet·brd/digital-protection-amulet.kicad_pcb
About the Digital protection amulet PCB
Digital protection amulet is an open source AVR/Arduino PCB design by akornsys-rdi, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 55 × 20 mm, with 22 components from 15 distinct parts.
Its main chip is the ATmega32U4-AU, from the AVR/Arduino family. By type, the board carries 8 capacitors, 7 resistors, 2 connectors, 2 diodes, 1 IC and 1 crystal.
From the project
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Skeleton can be obtained on GitHub: Skeleton.
This project may contain some of the following sections:
- /3d/ 3D modeling, source and rendering designs. - /brd/ EDA designs, schematics, PCBs, libraries, datasheets and manufacturing files such as gerber, BoM and PDF. - /hdl/ Hardware description files, such as VHDL.

Main components on the Digital protection amulet
Digital protection amulet bill of materials (BOM)
22 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATmega32U4-AU | TQFP-44_10x10mm_P0.8mm | U1 |
| 1 | 16MHz | Crystal_SMD_EuroQuartz_X22-4Pin_2.5x2.0mm | Y1 |
| 1 | ISP | IDC-Header_2x03_P2.54mm_Vertical | J1 |
| 1 | USB_B_Micro | USB_Micro-B_Amphenol_10118194_Horizontal | J2 |
| 1 | 200mA | Fuse_1210_3225Metric_Castellated | F1 |
| 1 | CLMVC-FKC | LED_Cree-PLCC4_2x2mm_CW | D1 |
| 1 | STF202-22T1G | TSOP-6_1.65x3.05mm_P0.95mm | D2 |
| 3 | 100nF | C_0805_2012Metric | C1, C2, C3 |
| 2 | 12pF | C_0805_2012Metric | C4, C5 |
| 1 | 4.7nF | C_0805_2012Metric | C6 |
| 1 | 22µF | CP_EIA-3216-18_Kemet-A | C7 |
| 1 | 1µF | C_0805_2012Metric | C8 |
| 2 | 10k | R_0805_2012Metric | R1, R7 |
| 2 | 1M | R_0805_2012Metric | R2, R6 |
| 3 | 220R | R_0805_2012Metric | R3, R4, R5 |
Digital protection amulet design files
The KiCad project lives in the akornsys-rdi/digital-protection-amulet repository on GitHub; these links point at the commit this page was built from.
Digital protection amulet: common questions
What microcontroller does the Digital protection amulet use?
The Digital protection amulet is built around the ATmega32U4-AU, from the AVR/Arduino family.
How big is the Digital protection amulet PCB?
The Digital protection amulet measures 55 × 20 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Digital protection amulet?
22 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Digital protection amulet design files?
From the akornsys-rdi/digital-protection-amulet repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Digital protection amulet design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which akornsys-rdi chose for the repository.
Can I test firmware for the Digital protection amulet 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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