Stepper Motor very slow. Can't figure it out

Using Arduino Motors, Mechanics, Power and CNC
1

With the setup and code below my stepper motor is only turning about 1 revolution every 10 seconds. According to my power supply it's only drawing about .22 Amps which isn't enough.

The stepper driver I'm using is the TMC2209 v1.3 which seems to have no documentation from v1.2.

Screen Shot 2024-08-03 at 7.37.26 AM
Screen Shot 2024-08-03 at 7.37.26 AM1834×1346 232 KB

#include <AccelStepper.h>
#include <MultiStepper.h>
/*

*/

AccelStepper stepper1(1, 4, 2);


void setup() {
  Serial.begin(9600);
  stepper1.setMaxSpeed(2000);
  stepper1.setSpeed(2000);
  pinMode(8, INPUT_PULLUP);
 
}

void loop() {

     
     
      if(digitalRead(8) == LOW){
        Serial.print("button on");
        stepper1.runSpeed();
        
      }
    
}

I don't even know what to troubleshoot at this point. Would love some thoughts. Thank you

2

can you clarify exactly how you power the motor ?

otherwise you should remove the Serial.print("button on"); from the loop as you'll soon saturate the Serial port and print will become blocking, especially at 9600 bauds. ➜ this becomes a throttling factor to your stepper

3

TMC2209_datasheet_rev1.08.pdf (analog.com)

1 Like
4 
#include <AccelStepper.h>
#include <MultiStepper.h>
AccelStepper stepper1(1, 4, 2);

void setup() {
  stepper1.setMaxSpeed(200);
  stepper1.moveTo(2000);
  pinMode(8, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(8) == LOW) stepper1.run();
}
5

What's wrong with that? Why is it not enough? What's the voltage of your PSU?
How did you set the current at the TMC2209?

The slow speed is caused by too much Serial prints

6

It was the serial prints. :face_with_peeking_eye:

Thank you

7

glad it was solved! have fun.