Hi. So as the title reads my stepper motor will not move and I feel I've tried and read everything an am beyond stumped.
So the basics are that I'm trying to make a small stepper motor move backwards and forwards a quarter turn 3 times. I'm running it off of an Arduino Nano and using a breadboard to make the connections to a motor driver (ULN2003AN) and small stepper motor (28BYJ-48).
The schematic I used for wiring is as follows:
The datasheet for the driver is here:
And the datasheet for the motor is here:
Now I had been originally following directions from this lovely person over at makerguides as I was trying to make this work with the exact same components (albeit a nano instead of an uno):
However my motor will. not. move.
I started this with the intention of having it triggered off of a button and was using this code for it
const int stepsPerRevolution = 2038; // change this to fit the number of steps per revolution
// for your motor
// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);
// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
void setup() {
// set the speed at 60 rpm:
myStepper.setSpeed(5);
// initialize the serial port:
Serial.begin(9600);
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}
void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed. If it is, the buttonState is HIGH:
if (buttonState == HIGH) {
digitalWrite(ledPin, HIGH);
// step one revolution in one direction:
Serial.println("clockwise");
myStepper.step(500);
delay(750);
// step one revolution in the other direction:
Serial.println("counterclockwise");
myStepper.step(500);
delay(750);
// step one revolution in one direction:
Serial.println("clockwise");
myStepper.step(500);
delay(750);
// step one revolution in the other direction:
Serial.println("counterclockwise");
myStepper.step(500);
delay(750);
// step one revolution in one direction:
Serial.println("clockwise");
myStepper.step(500);
delay(750);
// step one revolution in the other direction:
Serial.println("counterclockwise");
myStepper.step(500);
delay(750);
}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}
The button itself functions and when I connect the motor directly to pins 7-11 (as the molex also includes power with the four phases) I can feel it vibrate when it should be moving and pause when it should delay. I know its underpowered and generally a bad idea to run it off the board itself but I was trying to eliminate issues. What that seems to tell me is the code is in fact trying to move the motor.
Moving on I connected it to the motor driver and powered that with an AC-DC power supply. The output is 5V-2.1A. I have metered everything to confirm I am getting 5V in and seem to be getting a fluctuation between 2.5-5V on each phase. All 4 LED lights are illuminated but don't seem to change. The motor itself simply gets hot.
I have tried swapping both the motor for another one thats exactly the same and the motor driver for a different but same model and no dice. I went back to basics and connected the motor directly to the board and uploaded a basic stepper code and got the motor to move back and forth.
/*
Stepper Motor Control - one revolution
This program drives a unipolar or bipolar stepper motor.
The motor is attached to digital pins 8 - 11 of the Arduino.
The motor should revolve one revolution in one direction, then
one revolution in the other direction.
Created 11 Mar. 2007
Modified 30 Nov. 2009
by Tom Igoe
*/
#include <Stepper.h>
const int stepsPerRevolution = 200; // change this to fit the number of steps per revolution
// for your motor
// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);
void setup() {
// set the speed at 60 rpm:
myStepper.setSpeed(60);
// initialize the serial port:
Serial.begin(9600);
}
void loop() {
// step one revolution in one direction:
Serial.println("clockwise");
myStepper.step(stepsPerRevolution);
delay(500);
// step one revolution in the other direction:
Serial.println("counterclockwise");
myStepper.step(-stepsPerRevolution);
delay(500);
}
I also found this thread and thought it would solve all of my problems but after trying all of the code listed and linked to throughout I still have had no luck. LED lights are still constant on and motor just slowly gets hot.
I am not the smartest human and am relatively new to this but I do feel this should be insanely simple and for whatever reason it is not. Please, someone significantly smarter than me help me because I feel like my brain is now soup.
-B