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Tumbly is a low-cost, battery-powered time-restricted feeding device for home-cage use. A servo rotates the food hopper open or closed on a schedule, and every event is logged to an SD card. It is based on the Tumble Feeder.

🎬 Build video

Watch the full build start to finish, then use the steps below as a reference while you work.

Build steps

Follow these in order. The sidebar has the same links on every page.

Step	What you'll do
1. Gather parts	Order the components, PCB, and battery
2. 3D print the parts	Print the base, hopper, and door
3. Assemble the electronics	Populate the custom PCB and stack the Feather boards
4. Flash the code	Install the Tumbly Arduino library and upload the sketch
5. Assemble Tumbly	Mount the electronics and servo in the printed parts
6. Set up and use Tumbly	Calibrate the door, set the schedule, and read your data

Hardware at a glance

• Adafruit Feather M0 Adalogger (microcontroller + SD card)
• Adafruit DS3231 RTC FeatherWing (real-time clock)
• Adafruit 128x64 OLED FeatherWing (SH1107)
• Custom Tumbly PCB
• Feedback servo
• LiPo battery (a 2200 mAh battery runs ~50–100 days; see Power consumption)

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Next → Step 1: Gather parts