So you are planning to go on a vacation and would like to feed your fish automatically? RobotGeek has shared a guide that shows you how to make your own 3D printed Automatic fish feeder with Arduino. It uses a RobotGeek 180 Degree Servo to feed your fish for up to 10 days.
You are going to need a Geekduino, 7V5A power supply, RobotGeek Sensor Shield, 1 x rotation knob, and a few other parts to complete this project.