Automatic Pellet Feeder for Shrimp Aquarium

thingiverse

Have you wanted to automate feeding your small family of shrimp? But find automatic fish feeders dump way too much food every day, polluting the water? HI JOSH HERE AGAIN WITH THE AUTOMATIC PELLET FEEDER FOR SHRIMP FEED YOUR SHRIMP UP TO 32 TIMES WITH JUST A [SINGLE PELLET](https://smile.amazon.com/Aquatic-Arts-Spirulina-Freshwater-Invertebrates/dp/B00I33OWY6) AT A TIME FITS ON ANY 3.6MM RIMLESS AQUARIUM SOME ASSEMBLY REQUIRED ## Parts * Printed Automatic Pellet Feeder for Shrimp: base, carousel and optional lid * [Arduino](https://smile.amazon.com/ELEGOO-Board-ATmega328P-ATMEGA16U2-Compliant/dp/B01EWOE0UU) with 4 free digital output pins and 5v * [Elegoo 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board](https://smile.amazon.com/ELEGOO-28BYJ-48-ULN2003-Stepper-Arduino/dp/B01CP18J4A) or equivalent * 2x M3 screws (2.3mm head height) * 2x M3 nuts * 1x boba tea (extra large) straw, optional ## Hardware 1. Bolt the stepper motor to the base using the M3 parts, screw facing up 2. Pressure-fit carousel onto stepper motor shaft 3. Optionally superglue the straw to the dispenser chute to guide sinking food down 4. Wire the Arduino to the stepper motor & controller board as seen in Thing photo ## Firmware 1. Open the attached .ino sketch file in Arduino IDE 2. In Arduino IDE: `Sketch` -> `Include Library` -> `Manage Libraries...`. Then search and install `accelstepper` (currently 1.59.0) 3. Customize parameters like rotation interval, reservoirs per interval 4. Upload sketch file to program the Arduino ## Feed my shrimp already 1. Hand align a carousel reservoir with the dispenser chute 2. Fill every other carousel reservoir with desired dose of food * on power up/reset, the feeder will rotate once so you know it is working 3. Power Arduino and stepper motor assembly (5v USB or power supply) 4. Go on vacation 5. Shrimp get fed