For the digital section I went with the Atm… erm, Microchip ATSAML21E18B as I already had a previous project centered around it. It’s capable of low power operation and is packed with both analog and digital peripherals that make it quite versatile. It’s got USB and I adapted this UF2 bootloader to run on my board which makes development a lot easier.
![](https://cdn.hackaday.io/images/7299611708408571433.jpg)
Features
- Most of the pins broken out to headers
- On-board Li-Ion battery charger - Microchip MCP73832. It can be disabled for use with non-rechargeable batteries
- Power jumper. Can be used to measure current on the 3V3 line
- Type-C port with TVS diode protection
- User LED and button
- Reset button & circuitry
- Header close to MCU for pins connected to the internal opamps
Schematic
![](https://cdn.hackaday.io/images/3371711708408608415.png)
Discussions
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