9v battery to power two 3v motors??

Submitted by Makeosaurus on Fri, 01/22/2016 - 10:19

Forums:

I have bought the picoborg and two of these motors:
http://www.modmypi.com/electronics/motors-and-robotics/dc-motor-3v-inc.-... . Would I be able to run them off a 9v battery. At the moment, I don't have any money so hopefully I don't need a voltage regulator!

piborg's picture

piborg

Fri, 01/22/2016 - 22:28

Yes, you will be able to control those motors with PicoBorg and a 9V battery.

What you need to do is limit the maximum power output from the PicoBorg to 33%.
This can be done by using the software PWM functionality in wiringpi.

There is a PWM example for PicoBorg and a joystick here: JoyBorgPwm.
In order to change the maximum power you will need to alter the lines:

driveLeft = int(driveLeft * 100)

and

driveRight = int(driveRight * 100)

to use 33 instead of 100, so:

driveLeft = int(driveLeft * 33)

and

driveRight = int(driveRight * 33)

Makeosaurus

Fri, 03/11/2016 - 08:30

I have looked through the code that you have in the link and I don't see anything that corresponds to this in any way to the code that you posted enough. Would you be able to tell me which lines of code or is there a mistake above?

piborg's picture

piborg

Fri, 03/11/2016 - 10:15

The driveLeft line is number 132.
The driveRight line is number 139.

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