Stepper Driver A4988 - PIC,8051,AVR ,USB PROGRAMMER,DEVELOPMENT BOARDS - alselectro

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Stepper Driver A4988

Stepper Drive A4988

Rs 220.00(GST excl.) Add

A4988 Stepper Motor Driver

       






This product is a breakout board for Allegro’s A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection.
This stepper motor driver lets you to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and 2 A.

The translator is the key to the easy implementation of the A4988. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program.The A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable .

Features


Simple step and direction control interface

Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step

Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates

Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay)

Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection

Short-to-ground and shorted-load protection




The driver requires a logic supply voltage (3 – 5.5 V) to be connected across the VDD and GND pins and a motor supply voltage of (8 – 35 V) to be connected across VMOT and GND. These supplies should have appropriate decoupling capacitors close to the board, and they should be capable of delivering the expected currents (peaks up to 4 A for the motor supply).

Stepper motors typically have a step size specification (e.g. 1.8° or 200 steps per revolution), which applies to full steps. A microstepping driver such as the A4988 allows higher resolutions by allowing intermediate step locations, which are achieved by energizing the coils with intermediate current levels. For instance, driving a motor in quarter-step mode will give the 200-step-per-revolution motor 800 microsteps per revolution by using four different current levels.

The resolution (step size) selector inputs (MS1, MS2, MS3) enable selection from the five step resolutions according to the table below.



Arduino Example code :


int dirPin = 8;
int stepperPin = 7;

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);
}


Warning
Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver.

A4988 DATASHEET



 
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