Hello, I'm using the stepper motors SX16 and a A4988 motor drivers on CNC shield V3. I can change the value of the direction PIN in code, but the direction and actual voltage on the PIN stays the same. I have downloaded a code from a video where the same components were used and everything worked…

R100 = 100 milliOhm, so you did not buy that module from Pololu (who use TWO DIFFERENT values for the current sense resistor on their A4988 drivers: 50 milliOhm and 68 milliOhm). The appropriate formula for the 100 milliOhm resistor and 0.4 A/winding would be Vref = 0.8*ITripMax = 0.32V As pointed…

Robin2: To start with, make the motor go a great deal slower. Your total step interval is 600 microsecs or 1667 steps per second. Start with 5 steps per second. ...R Stepper Motor Basics Simple Stepper Code Robin, I tried both of your codes and they don't work. I am using the CNC shield so t…

jremington: R100 = 100 milliOhm, so you did not buy that module from Pololu (who use TWO DIFFERENT values for the current sense resistor on their A4988 drivers: 50 milliOhm and 68 milliOhm). The appropriate formula for the 100 milliOhm resistor and 0.4 A/winding would be Vref = 0.8*ITripMax = 0.3…

To slow down the step rate, try using delay(10) instead of delayMicroseconds: delayMicroseconds(stepDelay); digitalWrite(stepperPin, LOW); delayMicroseconds(stepDelay); The driver triggers the step on the rising edge of STEP, so you don't need to wait for the trigger. The minimum STEP …

jremington: To slow down the step rate, try using delay(10) instead of delayMicroseconds: delayMicroseconds(stepDelay); digitalWrite(stepperPin, LOW); delayMicroseconds(stepDelay); The driver triggers the step on the rising edge of STEP, so you don't need to wait for the trigger. …

darren41448: Wait, that sounds way too simple to work. If you have time, would you tell me what was happening? It's essentially the same as what I said in Reply #5. You were trying to make your motor go instantly from 0 to 100 miles per hour :slight_smile: ...R

I'm using the stepper motors SX16 and a A4988 motor drivers on CNC shield V3. I can change the value of the direction PIN in code, but the direction and actual voltage on the PIN stays the same. I have downloaded a code from a video where the same components were used and everything worked perfect…

Why have you started a new Thread? Your other Thread has all the necessary background information. I suggest you click Report to Moderator and ask to have them merged. ...R

Robin2: Why have you started a new Thread? Your other Thread has all the necessary background information. I suggest you click Report to Moderator and ask to have them merged. ...R Done. Do you have any idea to solve this? I wouldn't ask here if I hadn't done few hours of research without res…

Stepper motor SX16 can't change direction

Other Hardware Motors, Mechanics, Power and CNC

darren41448 July 7, 2019, 8:35pm 13

Thank you guys so much. I have been stuck just because of this for two weeks, burned two uno boards and two drivers. Finally

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Stepper motor SX16 can't change direction

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