This project is my attempt at an automated cat feeder.
Raspberry Pi 3 breadboard servo (Futaba S3003) switch and led
an actual cat feeder (cereal dispenser or homegrown PVC setup) second servo and feed bin (some dispensers are dual bin already) cat-triggerable button
webcam motion sensor
feed by pushbutton feed by email with trigger phrase in subject or body feed by text (uses google voice, which is forwarded to email)
feed by cat (using pushbutton - maybe headbutt a panel over a switch?) feed treat portion instead of full portion (possibly using second servo and feeder) motion-sensor triggers feed, camera, or both web-cam