1

My setup is as follows:

  • Using this motor controller board, I have one DC motor (I'm new to electronics, so I'm not sure when I say it's rated at 1.5V, because one 1.5V AA battery on its own makes it run perfectly). This motor is connected to the OUT1 and OUT2 terminals on the H-bridge.

  • I have one 1.5V AA battery, with its positive end connected to the VCC terminal, and it's negative end connected to the GND terminal. The RPi's +5V GPIO is connected to the +5V terminal, and the RPi's ground is connected to the GND terminal as well.

  • GPIO pins 15 and 13 are connected to IN1 and IN2, respectively. I am using this tutorial setup (with the code at 14:30, in case it didn't skip there. I do not have pins 7 and 11 in use, because I'm only controlling one motor).

After all of this, the motor does not run. I don't even know how to test where the problem lies. I have tried it with 2 and 3 batteries, still to no avail. I have also tried switching to IN3 and IN4, and even switching around the (True and False) parameters in the GPIO.output() function. Am I doing something wrong at all? I have nearly the exact same setup as the tutorial, with a few differences. Thank you for any help! :)

0

The motor driver board says VCC (motor supply voltage) should be between 5 and 35 volts.

From what you say you are only supplying about 1.5 volts.

Try 3 to 5 cells in series to get (say) between 4.5 to 7.5 volts.

If you can, use a multimeter to measure the voltages you are supplying.

It is probably best to remove the Pi 5V connection. Leave the Pi ground connection in place.

  • Thanks for the reply! I removed the Pi's 5V connection and I'm using 5 batteries, still nothing :( The LED on the motor driver board doesn't turn on unless the Pi's 5V connection is in, not sure if that matters either – Shadow Mar 29 '15 at 17:53
  • Are the batteries in series? You really need a multimeter. If the LED doesn't light that suggests the batteries are not supplying enough power. – joan Mar 29 '15 at 17:59
  • Yep they are! I feel like a fool for asking, but should the negative/positive end of the series be connected to GND and VCC, respectively, or the 5V terminal and VCC respectively? – Shadow Mar 29 '15 at 18:07
  • The battery -ve to GND, battery +ve to VCC. Pi GND to GND. – joan Mar 29 '15 at 18:09
  • Yep that's how I have it, it's solved now! I am ashamed to say I didn't see that the battery pack had a broken metal contact and it wasn't in contact with one of the batteries in the series, I've been at this for two days and this was the reason aha, thanks a lot for your patience appreciate it :) it needed 4 batteries minimum! – Shadow Mar 29 '15 at 18:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.