Rp2040

This is a very simple clock with a seven segment display made by connecting a few off the shelf components. No soldering was needed thanks to the STEMMA QT connections. The clock has no user interface. You just plug in a USB cable for power and that's it. It's accurate and survives power outages thanks to a CR1220 backup battery. The software is about 50 lines of MicroPython code. It syncs the DS3231 RTC to the Pico RTC on startup and again every hour. It updates the display every second to show the current time and flash the colon. When connected to a computer by USB, it can easily sync the time from the computer to the DS3231 RTC. I do this twice a year for DST changes. ...

This is a motion-activated light controller for LED light strips. It's basically a fancy night light. It allows up to two PIR motion sensors to trigger up to two LED light strips. If motion is detected and the room is dim, the light strips fade in to a low brightness. After enough time has passed without motion detected, the light strips fade out. This is suitable for dark closets, bedrooms, etc. ...