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| Stepper Motor |
The Following are required to run a stepper motor:
1. Arduino Mega 2560 board:
The Arduino Mega 2560 is a microcontroller board based on the ATmega2560.
It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.
It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila.
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| pin layout of arduino |
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| Digital Pins of Arduino |
2. ULN2003AN IC:
The ULx200xA devices are high-voltage, high-current darlington transistor arrays. Each consists of 7 NPN darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads.
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| IC pin layout |
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| internal logical view |
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| darlington pair |
3. 28BYJ-48 Gear Stepper Motor:
This 5V DC 28BYJ-48 Stepper Motor is a small, inexpensive, and high-quality geared step motor.
The 28BYJ-48 Stepper Motor and ULN2003 Stepper Motor Driver is a widely popular combination of the stepper motor and stepper driver, because of the stability and reliability of the system.
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| 28BYJ-48 stepper motor |
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| pin diagram of stepper motor |
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| Sequence to rotate in clockwise |
Connections to Arduino board:
Here map the arduino pins D8-D11 to arduino mega 2560's D22-D25 pins. The stepper motor is connected to ULN2003AN/ULN2004A IC .
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| pin connections of stepper motor, ULN2003AN & arduino |
#define STEPPER_PIN_1 22
#define STEPPER_PIN_2 23
#define STEPPER_PIN_3 24
#define STEPPER_PIN_4 25
int step_number = 0;
void setup() {
pinMode(STEPPER_PIN_1, OUTPUT);
pinMode(STEPPER_PIN_2, OUTPUT);
pinMode(STEPPER_PIN_3, OUTPUT);
pinMode(STEPPER_PIN_4, OUTPUT);
}
void loop() {
OneStep(false);
delay(200);
}
void OneStep(bool dir){
if(dir){
switch(step_number){
case 0:
digitalWrite(STEPPER_PIN_1, HIGH);
digitalWrite(STEPPER_PIN_2, LOW);
digitalWrite(STEPPER_PIN_3, LOW);
digitalWrite(STEPPER_PIN_4, LOW);
break;
case 1:
digitalWrite(STEPPER_PIN_1, LOW);
digitalWrite(STEPPER_PIN_2, HIGH);
digitalWrite(STEPPER_PIN_3, LOW);
digitalWrite(STEPPER_PIN_4, LOW);
break;
case 2:
digitalWrite(STEPPER_PIN_1, LOW);
digitalWrite(STEPPER_PIN_2, LOW);
digitalWrite(STEPPER_PIN_3, HIGH);
digitalWrite(STEPPER_PIN_4, LOW);
break;
case 3:
digitalWrite(STEPPER_PIN_1, LOW);
digitalWrite(STEPPER_PIN_2, LOW);
digitalWrite(STEPPER_PIN_3, LOW);
digitalWrite(STEPPER_PIN_4, HIGH);
break;
}
}else{
switch(step_number){
case 0:
digitalWrite(STEPPER_PIN_1, LOW);
digitalWrite(STEPPER_PIN_2, LOW);
digitalWrite(STEPPER_PIN_3, LOW);
digitalWrite(STEPPER_PIN_4, HIGH);
break;
case 1:
digitalWrite(STEPPER_PIN_1, LOW);
digitalWrite(STEPPER_PIN_2, LOW);
digitalWrite(STEPPER_PIN_3, HIGH);
digitalWrite(STEPPER_PIN_4, LOW);
break;
case 2:
digitalWrite(STEPPER_PIN_1, LOW);
digitalWrite(STEPPER_PIN_2, HIGH);
digitalWrite(STEPPER_PIN_3, LOW);
digitalWrite(STEPPER_PIN_4, LOW);
break;
case 3:
digitalWrite(STEPPER_PIN_1, HIGH);
digitalWrite(STEPPER_PIN_2, LOW);
digitalWrite(STEPPER_PIN_3, LOW);
digitalWrite(STEPPER_PIN_4, LOW);
}
}
step_number++;
if(step_number > 3){
step_number = 0;
}
}
Setup images & working video:
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