We’re currently experiencing some technical difficulties that may result in some difficulty placing orders. Please direct order questions or issues to support@sparkfun.com for us to work with you on resolving. We’ll respond to emails as quickly as we can in the order they were received. We are working on getting everything fixed as quickly as we can. Thank you for your patience.


Member Since: August 19, 2012

Country: United States

  • Never mind… I found a short in my wiring.

  • Hey guys, I am using two of these in parallel to with an Arduino pro mini (5v) to drive the Tamiya Twin Motor Gearbox. My battery is a 9v, so I need to limit my voltage supply to 3v for the motors. When I set my PWM output to 80 (about 1/3 of 255), I measure around 7 volts on my multimeter (no motor connected). My question is: why isn’t the voltage around 3v when PWM is at 80? In other words, does the PWM from the Arduino linearly control the output to the motor? Do I read 7v on the multimeter because there is no load on the chip? I connected a resistor between the outputs and the readings were around 2.5v. I’ve used this chip before without issues, but I’m not sure what’s going on here. Any help is appreciated. Thanks!

No public wish lists :(