Post by thread:[OT]: Motor Driver. Need Help!

Hi everyone, I am building a small robot and I run into the problem of finding the right Motor Driver and the method of controlling the motor. I want to be able to make the robot go forward, backward, and stop. I also want to be able to control the speed. Controlling the speed, I think I can use the PWM method to control it. Questions: 1. If I use PWM, at what frequency should I use? 2. Is there any motor driver out there that can control 2 motors? (I need 2 motor drivers) 3. Do you have the schematic of the motor driver circuit? I will need it to build my driver. 4. Any other method to control the motor and its speed? Thank you everyone in advance! Best regards, Thomas _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

Hi Thomas Have you considered using stepper motors. They are highly controllable, especially by digital control. A good source of information can be found at http://www.cs.uiowa.edu/~jones/step/index.html I am currently working on a MicroMouse project for University, which includes stepper motors, and hope to use a PLD to Full-step or Half-step, forwards or backwards. With best regards Petra {Original Message removed}

Thomas N wrote: {Quote hidden}> > Hi everyone, > > I am building a small robot and I run into the problem of finding the right > Motor Driver and the method of controlling the motor. > > I want to be able to make the robot go forward, backward, and stop. I also > want to be able to control the speed. Controlling the speed, I think I can > use the PWM method to control it. > > Questions: > > 1. If I use PWM, at what frequency should I use? > > 2. Is there any motor driver out there that can control 2 motors? (I need 2 > motor drivers) > > 3. Do you have the schematic of the motor driver circuit? I will need it to > build my driver. > > 4. Any other method to control the motor and its speed? A good beginner system is to use a single NPN transistor to drive the motor, either on/off or with pwm. That depends on software. For motor reversal you can use any DPDT relay (2x changover) to simply reverse the motor leads. As your robot spends most of it's time going forward this can be the most energy efficient system for a battery operated robot. Search Yahoo for "hobby robot motor" and see what comes up! :o) -Roman -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads