KS0378 Keyestudio Reprap Stepper Driver A4988 Kit (5PCS)

Keyestudio UNO R3 Board

Introduction

This stepper motor driver is powered by A4988, a DMOS microstep driver with converter and over-current protection. It is available in full, half, 1/4, 1/8 and 1/16 stepping modes to operate bipolar stepper motor with output drive performance up to 35 V and ± 2A. The A4988 includes a fixed turn-off time current regulator that operates in slow or mixed decay mode. The converter is the key to implement the A4988. As long as the "step" input carries in a pulse, it can drive the motor to produce micro-step. There is no need for phase sequence tables, high frequency control lines or complex interface programming. The A4988 interface is ideal for complex microprocessors that are not available or overloaded.

Specifications

1. With only simple step and direction control interface; 2. Five different step modes: full, half, 1/4, 1/8 and 1/16; 3.Adjustable potentiometer can adjust the maximum current output, resulting in a higher step rate; 4. Automatic current decay mode detection / selection; 5. Overheat shutdown circuit, undervoltage lockout, cross current protection; 6. Ground short circuit protection and load short circuit protection.

Settings for working mode

Connection Diagram

It needs to connect DC 8-15V between motor power VMOT and GND.

Sample Code

int dirPin = 7;
int stepperPin = 8;
void setup() {
pinMode(dirPin, OUTPUT);
pinMode(stepperPin, OUTPUT);
}
void step(boolean dir,int steps){
digitalWrite(dirPin,dir);
delay(50);
for(int i=0;i<steps;i++){
digitalWrite(stepperPin, HIGH);
delayMicroseconds(800);
digitalWrite(stepperPin, LOW);
delayMicroseconds(800);
}
}
void loop(){
step(true,1600);
delay(500);
step(false,1600*5);
delay(500);
}

Test Result

The selection end MS1, MS2, MS3 of three modes are all connected to GND, that is, full-step mode, and the motor needs 200 stepping values or a stepping 1.8° to turn a round. In the experiment, we first let the stepper motor reverse 8 circles and delay 0.5 seconds; then turn 40 circles and delay 0.5 seconds. If it is an half-step mode, then the number of both positive and reverse circle should be halved.

Package Included

• Keyestudio Reprap Stepper Driver A4988 *5PCS