As already suggested, you can't move it straight unless you have some kind of positional feedback.

An easier 'solution' is to use stepper motors, which will give you a far better straight line - but even that isn't perfect, any slippage on the ground will make it veer off course.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

They make motor controllers that have feedback built in

__________________
Burt
http://mybe80be.com
http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

 

And the gearing from the motor to the ground means it won't be very accurate - better to take it direct from the wheel or axle.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

hi ,

Can you please guide me to a vendor where i can get these motors?

Thanks

 

If you have to pen point your target use a beacon
As for at the wheel or axle good ideal but you still need to see if the motor turned
They use them in copiers I have saved about 20 motors most use a encoder disk on one end of the motor

Oh Nigel the robot wheels may be rolling and you need to brake

__________________
Burt
http://mybe80be.com
http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1