Ask HN: What have you used a RaspberryPI/Arduino for?

Testing circuits I’ve made on a breadboard.

I have some addressable LED strips that I want to put on my car and make a stream of hearts and stars as I drive past or overlay my car (for one moment) with an Acura NSX or something like that. I got stuck developing a test framework for it (can’t test it fully in motion) and never figured out a good way to set it up in the car but really I should ‘just do it’.

Vex robotics kit driver for camera gimbal, ir Bridge, Bluetooth alarm clock, x10 bridge.

Raspberry Pi dedicated to just 2 jobs: Web Server and UPS controller.

I bought a couple of 64x64 LED Matrix displays and used an ESP32 to control the display of images on it.

It now makes a cool feature in my room

https://github.com/bradleeharr/Image-Display-LED-Matrix

https://github.com/bradleeharr/Perlin-Noise-LED-Matrix

College senior project - 3dof robotic arm on a vertical gantry system attached to a hydroponic garden. We used 2 arduino’s to control the lighting and gantry. Then one pi onboard the robot for imaging and another for a web user interface.

Air quality monitoring.

home fleet of security cameras

Powering TV displays at work with a simple script using feh and Syncthing for copying files over to the pi's around the factory