Raspberry Pi Pico 'Mind Your Head' Sign
My automated 'mind your head' warning sign uses a Raspberry Pi Pico with an ultrasonic sensor, programmed to light up a pair of LED backlight panels if someone gets within 30 cm of my low ceiling. It is also equipped with an alarm buzzer in case they get really close.
The project features in my latest YouTube videos, with Part 1 dealing with the wiring and programming for the Pico, sensor and LEDs, while in Part 2 I share how I added the buzzer and made the transparent text screen and 3D printed enclosure – the files for which you can find below.