Code provides adjustable differential drive for robots

Posted on Apr 13, 2012

Intelligently modifying the motor-drive commands to a robot can give you control finesse during competitions. Moving a joystick hard right, for example, might have different effects, depending on the robot`s speed and direction. Software running on an inexpensive microcontroller (in this case, an NEC (www.nec.com) PD78F9814) manages this control by calculating separate drive and adjust vectors and then combining the vectors and calculating the appropriate power ratio for two tread motors (Figure 1). This demonstration system uses a simple treaded toy vehicle to show how the ratio-drive concept works and requires no sensors in the vehicle.

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