[PhilBot]

Originally Posted by John_1102

I believe your problem is that the LabVIEW based code move fixed distance command uses PID.

Why do you say that? Did you read the paper?

Are you saying that 1) the LabVIEW code is implementing it's own PID to control the speed, or that 2) it is using a PID control function in the DC Motor Controller?

If you are saying the former then you are dead wrong. LabVIEW is NOT doing PID in either instance.

If you are saying the latter, then I don't see your point..

"Constant Speed", and "Run to Position" BOTH use a closed loop control function (possibly PID) to regulate the motor speed, but why should one run all the way up to 100% while the other is limited to 65% of full speed? Makes no sense.

It's completely logical that Robot C will see the same speed decrease if it's also using the DC Motor Controller's Encoder based moves. Have you studied C's low level Motor Controller calls to see what commands are being sent via the I2C bus? Do you know what commands are being sent?

Phil.