u/whlabratz

Hi All - full disclosure, I'm a software person who has used a fair bit of AI to go from "I think I understand ohms law" to an actual circuit board design; I think I've validated everything against datasheets and other sources, but I don't know what I don't know. A lot of the part choices are driven by what I have to hand or is cheap on Digikey, but please point out if any of those choices seem weird.

I'm trying to put together a simple Raspberry Pi HAT for my homelab with:

• A basic RTC (PCF85063AT) - doesn't need to be super precise, but enough that NTP can take over after boot. Deliberately using a CR2032 instead of a supercap for cost.
• A handful of status LEDs via an PCA6554 I2C IO expanded - I could drive these directly via GPIO, but I want to keep these free as much as possible
• A ATECC608B crypto chip to securely store auth keys/SSL certs/...
• External connectors for UART and a pair of GPIO lines
• An external connector for the I2C bus - planning on getting a small OLED display and connecting that up

Board will be mounted in a 3d-printed sled and mounted with the connectors and LEDs pointing out, using Wurth 155124xS73200 series LEDs for this.

Total volume is 5-10 units, I've done some SMD soldering but I'm planning on getting a stencil made and using an old toaster oven and ChipQuik Bi/Sn/Ag solder paste instead to make it a bit easier.

Thanks!