Cant control speed of dc motor with potentiometer

I am trying to control the speed of my dc motor with my potentiometer. But when I turn the potentiometer to max it works but when I turn it a little bit the dc motor turn off. Any idea why?

AnonEngineering•9/7/25, 6:13 PM

100 years ago they controlled motors that way

Original message was deleted

SlothOP•9/7/25, 6:16 PM

Just pot wired to the hw 130 motor shield v1. And the shield is ona aurdiono uno.

SlothOP•9/7/25, 6:31 PM

Yes the middle pin is connected to A0 and 2 outside 5v and gnd

SlothOP•9/7/25, 7:01 PM

I did and the pot value is from 1023 to 0 but when I used the potvalue to set motor speed: this is code to set motor speed "motor.setspeed(potvalue)"

SlothOP•9/7/25, 7:42 PM

In the graphic if i turned it to max it was not the smoothest but also not very static so in-between. And when it reached max it would be a flat line.

SlothOP•9/7/25, 7:42 PM

Is this wat you mean?

SlothOP•9/8/25, 6:34 AM

#include <AFMotor.h>

AF_DCMotor motor(1);

int potpin = A0;

int potval = 0;

void setup() {
Serial.begin(9600); // set up Serial library at 9600 bps
Serial.println("Motor test!");

// turn on motor
motor.setSpeed(0);

motor.run(RELEASE);
}

void loop() {

potval= analogRead(potpin);

Serial.print(potval);

Serial.print("\n");
motor.run(FORWARD);
motor.setSpeed((potval/1023)*255);

delay(100);
}

SlothOP•9/8/25, 6:35 AM

Here you go

SSloth Here you go

AnonEngineering•9/8/25, 1:32 PM

try this

/*
  Arduino | coding-help
  Sloth 9/8/25 — 2:34 AM
*/

int potpin = A0;

void setup() {
  Serial.begin(9600);
  Serial.println("Get pot value test!\n");
}

void loop() {
  int potval = analogRead(potpin);
  int setSpeed = (potval / 1023) * 255;
  int mappedSpeed = map(potval, 0, 1023, 0, 255);
  Serial.print("potval: ");
  Serial.println(potval);
  Serial.print("setSpeed: ");
  Serial.println(setSpeed);
  Serial.print("mappedSpeed: ");
  Serial.println(mappedSpeed);
  Serial.print("\n");
  delay(1000);
}

/*
  Arduino | coding-help
  Sloth 9/8/25 — 2:34 AM
*/

int potpin = A0;

void setup() {
  Serial.begin(9600);
  Serial.println("Get pot value test!\n");
}

void loop() {
  int potval = analogRead(potpin);
  int setSpeed = (potval / 1023) * 255;
  int mappedSpeed = map(potval, 0, 1023, 0, 255);
  Serial.print("potval: ");
  Serial.println(potval);
  Serial.print("setSpeed: ");
  Serial.println(setSpeed);
  Serial.print("mappedSpeed: ");
  Serial.println(mappedSpeed);
  Serial.print("\n");
  delay(1000);
}

AAnonEngineering try this ```c++ /* Arduino | coding-help Sloth 9/8/25 — 2:34 AM */ int potp...

SlothOP•9/8/25, 2:09 PM

Thx cant try yet but I'll get back to you when I tried it!

wtf•9/8/25, 5:47 PM

I see I see

/* Arduino | coding-help Sloth 9/8/25 — 2:34 AM */ int potpin = A0; void setup() { Serial.begin(9600); Serial.println("Get pot value test!\n"); } void loop() { int potval = analogRead(potpin); int setSpeed = (potval / 1023) * 255; int mappedSpeed = map(potval, 0, 1023, 0, 255); Serial.print("potval: "); Serial.println(potval); Serial.print("setSpeed: "); Serial.println(setSpeed); Serial.print("mappedSpeed: "); Serial.println(mappedSpeed); Serial.print("\n"); delay(1000); }

Cant control speed of dc motor with potentiometer

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