A4988 and 42 stepper motors

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A4988 Motor drive board pin

VMOT： Power supply positive （8~35V), Supply motor GND: Motor grounding 2B,2A: Motor windings 2 Control pin 1A.1B: Motor windings 1 Control pin VDD： The power supply of the drive board is （3~5V） GND： Drive plate ENABLE: Pin low level ,A4988 Only then can the motor drive work （ Hanging is the default state , It works ）, High level ,A4988 It will not be driven by the traveling motor MS1,MS2,MS3: It is used to change the driving mode, as shown in the figure REST： Low level active ,A4988 Reset the meridian line , The default is high , It works SLEEP: Low level operation and low energy consumption sleep state , It can be used with REST Connect , It will keep working normally and will not enter the state of low energy consumption . STEP: Step pin , Act according to the pulse DIR: Direction pin , low ： Clockwise , high ： Anti-clockwise

A46988 The voltage should be adjusted before use

voltage = Maximum current （ Motor current ）X A4988 resistance X8（ This case v=1.50.18=1.2） The general resistance is 0.05 o ,0.1 o ,0.2 o The potentiometer adjusts the voltage ： Turn it up clockwise , Turn it down counterclockwise （ Use a multimeter to measure the potentiometer and the grounding terminal ）

For this test arduino Development board

Procedure 1 ： Rotate clockwise , Rotate quickly counterclockwise 2 circle

//  Define constants for motor control 
// A4988 Connect Arduino Pin number 
const int dirPin = 2;  //  Direction pin 
const int stepPin = 3; //  Step pin 
//  Motor steps per revolution 
const int STEPS_PER_REV = 200; 
void setup() {
  // Arduino control A4988 The step and direction pins are in output mode 
  pinMode(stepPin,OUTPUT); 
  pinMode(dirPin,OUTPUT);
}
void loop() {
  //  Set the motor to rotate clockwise 
  digitalWrite(dirPin,LOW); 
  //  The motor rotates slowly 
  for(int x = 0; x < STEPS_PER_REV; x++) {
    digitalWrite(stepPin,HIGH); 
    delayMicroseconds(2000); // Delay 2000 Microsecond delayMicroseconds most 16383
    digitalWrite(stepPin,LOW); 
    delayMicroseconds(2000); 
  }
  //  Wait a second 
  delay(1000); 
  //  Set the motor to rotate counterclockwise 
  digitalWrite(dirPin,HIGH);
  //  The motor rotates rapidly 
  for(int x = 0; x < (STEPS_PER_REV * 2); x++) {
    digitalWrite(stepPin,HIGH);
    delayMicroseconds(1000);
    digitalWrite(stepPin,LOW);
    delayMicroseconds(1000);
  }
  //  Wait a second 
  delay(1000);
}

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