Fish Feeder Project

Update Dec.19,2017 - year in operation now, works reliable, no further modification was required.

This project is remix of “Automatic Fish Feeder with micro servo control V2” by Paulo Cunha.

I have slightly modified some parts, redesigned hopper, added base part and control box.
Initially I used original design with mixer inside hopper powered by spur gear. However, flake food was jammed in hopper sometimes and mixer did not help to prevent such situations. Therefore I have removed horizontal mixed and added much bigger vertical mixer powered by additional servo motor. After two months of operation it seems to be quite reliable.

Video: https://youtu.be/azTHyCNVLFo

Electronics is based on ATTiny841 chip programmed in Arduino IDE. Main goal was to keep power consumption low. The cpu is mostly in sleep mode, there is no display. Operation is triggered by real-time clock module DS3231. Powered by a single 18650 Li-ion Rechargeable Battery.

I have selected ATTiny841 because