March 1, 2018
From the Kravitz lab at the NIH comes a simple device for dispensing pre-measured quantities of food at regular intervals throughout the day. Affectionately known as “SnackClock”, this device uses a 24-hour clock movement to rotate a dispenser wheel one revolution per day. The wheel contains 12 compartments, which allows the device to dispense 12 pre-measured “snacks” at regular 2 hour intervals. The Kravitz lab has used this device to dispense high-fat diet throughout the day, rather than giving mice one big piece once per day. The device is very simple to build and use, requiring just two 3D printed parts and a ~$10 clock movement. There is no microcontroller or coding required for this device, and it runs on one AA battery for >1 year. The 3D files are supplied and can be edited to fit SnackClock in different brands of caging, or to adjust the number of snack compartments. With additional effort the clock movement could be replaced by a stepper motor to allow for dispensing at irregular or less frequent intervals.