Laptop to control robot

I would like to use my lap to to control my robot project. I have
serial and paralel port relay boards to use for control and sensors
but am unsure how to use the relay board to control motor speed etc..
I am new to this and would like any help you can give. Please use
email address to reply. Bill
Reply to
Bill
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As was stated before, you can't control a motor's speed with a relay board. I suggest a dual motor controller (H-bridge) with a serial interface. You can then command the motors' speed via serial port commands.
BRW
Reply to
Bennet Williams
Your post indicates a lack of electronics knowledge which cannot be filled with a simple reply.
You could use a relay board to turn the motors on/off and control thier direction of rotation. (Look for H-bridge). Speed control can be done by using a frequency controlled square wave to supply power to the motors. There are circuits for doing this. You might have four speeds, stop;slow;medium;fast that would be coded as say 00 01 10 11.
As for inputs you need more than a relay although relays might be used to select which input to read at any particular time.
You have not said what language you would program in?
JC
Reply to
John Casey

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