A HAT adapter board for Raspberry Pi 400Designed by CRImier in Latvia
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This is an adapter for plugging full-size HATs into a Raspberry Pi 400. The commonly recommended way to plug GPIO adapters onto a Pi 400 is to use a male-female extension cable - it's a flimsy connec…Read More…
This is an adapter for plugging full-size HATs into a Raspberry Pi 400. The commonly recommended way to plug GPIO adapters onto a Pi 400 is to use a male-female extension cable - it's a flimsy connection, it's not mechanically solid and it doesn't look as good. This adapter will give you a solid connection and hold your HAT parallel to the Pi 400 keyboard - with some useful connectors added, too!
Fixes in v2:
When I looked at Pi 400, I noticed - the GPIO header placement isn't very well-thought-out and feels more like an afterthought than anything. Ideally, the GPIO header pins would be available on top of the case, and everybody would be able to continue using the HATs as they did before - plug a HAT on top of your Pi and do whatever you want. However, the GPIO connector's placement is awkward, and the common suggestion is to use an adapter cable - that's just not as practical. This is the perfect addon for your Raspberry Pi 400 if you want to play with HATs comfortably.
I've worked with Raspberry Pi boards for a long time, in educational, embedded and recreational contexts, and I know the features that an average Pi user wants. This isn't just a sturdy GPIO-to-HAT adapter with a lot of care put into its design, I've added features and quality-of-life improvements to it, too.
One thing I wish I added but couldn't is a Raspberry Pi GPIO pinout silkscreened right on the PCB - it will be present on the boards from the next batch. Unfortunately, due to awkward orientation of the Raspberry Pi 400 GPIO header, it wasn't possible to use a 2-layer PCB for this adapter, so I had to go for more expensive 4-layer PCBs, otherwise this adapter would be even cheaper.
Oh, also - I have a small stock of cute SPI chip adapter boards - for reprogramming laptop BIOS chips and the like. Their pinout is compatible with the 12-pin header, and I've tested them to work with flashrom (through this adapter, of course). You can adopt one of these boards for the low low price of $1.50!
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