Amulet
About the Amulet PCB
Amulet is an open source STM32 PCB design by aykevl, published on GitHub. It is a 2-layer board measuring 40 × 60 mm, with 17 components from 11 distinct parts.
Its main chip is the STM32L031G6Ux, from the STM32 family. Other key parts include the BQ25173DSG. By type, the board carries 9 resistors, 4 capacitors, 2 ICs, 1 connector and 1 switch.
From the project
Collection of microcontroller projects
This is my personal stash of small electronics projects, usually written using TinyGo.
I won't guarantee anything about it. All I can say is that it did work for me at some point and I like sharing what I made. Many things are written once and then mostly forgotten so I probably won't provide any support for any of the code.
Feel free to use this code however you wish (in other words, you can treat it as public domain). Especially for small parts I won't mind if you just copy it in your project. For larger pieces of code or if you copy a project entirely, I would appreciate attribution…
Main components on the Amulet
Amulet bill of materials (BOM)
17 components, 11 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BQ25173DSG | WSON-8-1EP_2x2mm_P0.5mm_EP0.9x1.6mm | U1 |
| 1 | STM32L031G6Ux | QFN-28_4x4mm_P0.5mm | U2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | USB_C_Receptacle_GCT_USB4135-GF-A_6P_TopMnt_Horizontal | J2 |
| 1 | SW_Push | SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | 350F | CP_Radial_D13.0mm_P7.50mm_350F | C1 |
| 1 | 10uF | C_0402_1005Metric | C2 |
| 2 | 4.7uF | C_0402_1005Metric | C3, C4 |
| 2 | 5.1k | R_0603_1608Metric | R1, R2 |
| 1 | 375 | R_0402_1005Metric | R3 |
| 5 | 200 | R_0402_1005Metric | R4, R5, R6, R7, R8 |
| 1 | 10k | R_0402_1005Metric | R9 |
Amulet design files
The KiCad project lives in the aykevl/things repository on GitHub; these links point at the commit this page was built from.
Amulet: common questions
What microcontroller does the Amulet use?
The Amulet is built around the STM32L031G6Ux, from the STM32 family.
How big is the Amulet PCB?
The Amulet measures 40 × 60 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Amulet?
17 components, from 11 distinct parts. The full bill of materials is listed on this page.
Where can I download the Amulet design files?
From the aykevl/things repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Amulet design in my own project?
The repository has no license, so all rights stay with aykevl. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Amulet without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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