Automatic fish feeder
thingiverse
Small fish feeder designed specifically for nano-aquariums. The primary objective was to deliver food through a 5-millimeter gap between the glass cover and the aquarium's wall. You will need: A high-torque servo, such as the HXT900 Micro-Servo (1.6 kg/cm @ 0.12 sec / 9g), available at HobbyKing (https://hobbyking.com/en_us/hxt900-micro-servo-1-6kg-0-12sec-9g.html). A microcontroller, like the D1 Mini V3.0 (WIFI Internet of Things Development Board Based on ESP8266 4MB), available at Banggood (https://www.banggood.com/cs/Geekcreit-D1-Mini-V3_0_0-WIFI-Internet-Of-Things-Development-Board-Based-ESP8266-4MB-p-1264245.html). The controller's source code is available on GitHub (https://github.com/quibusus/aquariumfeeder). Two M3 screws, each 30 millimeters in length.
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