Too much power

A project log for Ultrasonic Parking Aid without Arduino

Low power, battery operated ultrasonic parking aid.

jscjsc 06/14/2014 at 02:070 Comments

Turns out the whole circuit draws 11 mA from the batteries when the ultrasonic sensor is plugged in, even when idle. I have respun the board to power the sensor through a pin instead of directly from VCC, so I can shut it off when not ranging.