Driving motors from VIN not recommended

A project log for Cat Dissuader

Non-destructive Super Soaker modification for Arduino control, with PIR motion detection.

jscjsc 06/09/2014 at 07:150 Comments

Switching VIN as I originally planned isn't going to work. With a 9V 1A wall wart, the motor startup current is too high and resets the Arduino. Dedicating a second power supply to drive the motor and switching it through a relay works, and will isolate circuit ground from any inductive spikes when the motor stops.