I noticed that the Summer of Green Tech Design Challenge is being sponsored by Seeed Studio and uses a kit that includes the Xiao SamD21 microcontroller and a Grove sensor pack. I've been using Xiaos for over a couple of years (SamD21 mini modules), so I'm looking forward to seeing the challenge projects.
I use the Xiao ecosystem quite a lot and like the convenience of the different expansion boards and Grove modules for prototyping. I've also used all of the processor variants (SamD21, RP2040, nRF52840, ESP32S3) and the Adafruit QT Py variants (SamD21, RP2040). The newest Xiao accessory is a 39mm round display with quite a few features. I've had one for a while, but have been too busy to try it out until now.
The Xiao plugs directly into the back of the display
A great feature set
There is also a STL file for the case
The obvious application is for a clock
Digital
Video of analog clock
Sorry for the poor image quality, I'm still messing with the configuration so I don't have the bottom of the case on and have a lot of bleed from the red LEDs on the Xiao and the display board. For these examples I used a Xiao RP2040.
I'm using the Arduino IDE and am having some issues with the Seeed documentation and examples, but hopefully will get that worked out soon. I haven't come across that high resolution clock face that they show on the product page.
The display is probably best suited for a Xiao with rf capability, so either the nRF52840 or ESP32S3. I'd really like to use it with an image sensor, but I'm having problems getting some of the ESP32S3 Sense examples to work. That's going to be my next project.
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