last modified: October 23, 2025
Posted on 2021-03-21— 3D Printing, Projects
I tested the pet feeder’s turntable position sensor and share my measurements, circuit details, MicroPython test code, and a short video of the controller in action. Read on for calibration tips, resistor choices, and next steps for compartment sensors if you want the full tests and sources.
Posted on 2021-03-15— 3D Printing, Common
I've assembled the new input boards for the pet feeder and I'm testing the sensors—940nm IR LEDs paired with phototransistors. I share photos of the board top and underside, the turntable mounting, and revision notes. Please read on if you'd like to see the test results and next steps.
Posted on 2021-02-18— 3D Printing, Projects
In Part 6 I walk you through the input panel for my 3D-printed pet feeder: the rotary encoder, LEDs, knob and the example PCB with wiring, filters and level shifting. I include printable files, Gerbers and ordering tips — read the full post for downloads, schematics and testing notes.