control pid motor dc labview arduino pdf

L298N is powered from 12 V and so is the motor. Two PWM outputs are required because the motor must be able to rotate in either direction. The right way is to apply PWM at the H-bridge input. When PWM output is low, the H-bridge is disabled and the motor axis can be easily rotated by external forces. Using regular digital pins for H-bridge and a single PWM pin wired to enable input is wrong. I've seen people using L298N with PWM in two ways. That's optional, you may use any Arduino board which has 2 PWM outputs and one interrupt pin available. I used an Arduino Uno board fitted with the LCD-Keypad shield. But tweaking the PID parameters for the best results took me a while. I'm not saying PID is difficult when you have Arduino libraries. Let's start with the easy stuff: wiring and encoder testing. The motor with optical encoder wired to Arduino Wiring The proper approach requires a PID (proportional-integral-derivative) control algorithm which adjusts motor speed using PWM.

Due to inertia, it continues to move a bit, even with the motor electrically shorted.

Suddenly stopping the motor will not result in a sudden stop of the sliding block. I just can't turn on motor until the reading of encoder equals the desired position. The software is not as simple as you may think. I had to drive the motor with a L298N H-bridge module and for the encoder I built a PCB which replaced the original one used in printer. Original printer electronics such as motor drivers were of no use (proprietary ICs without public datasheets). As I found out, the printer used a common DC motor to move the cartridges on X axis, however with the addition of an optical encoder with strip, the cartridges could perform precise movements. In the previous post I gathered information about a cartridge slide unit taken from an old inkjet printer.

How to move a sliding cartridge unit from an inkjet printer using a PID controlled DC motor with optical encoder feedback

Control pid motor dc labview arduino pdf