When pulled low, all STEP inputs are ignored until you pull it high. Meaning, pulling this pin low puts the driver in sleep mode, minimizing the power consumption. You can choose a different digital pin if you want, but these are the ones I used for this tutorial and the example code. The STP (step) and DIR (direction) pin are connected to digital pin 3 and 2 respectively.The GND pin (lower right) is connected to the ground pin of the microcontroller and VDD is connected to 5V.The two coils of the stepper motor are connected to 1A, 1B and 2A, 2B (see below).The motor power supply is connected to GND and VMOT (top right).The connections are also given in the following table: A4988 Connections A4988 The wiring diagram/schematic above shows you how to connect the A4899 driver to a stepper motor and the Arduino. Wiring – Connecting A4988 to Arduino and stepper motor Wiring diagram/schematic for A4988 stepper motor driver with Arduino and stepper motor. If you are using the driver with a breadboard, you can just use jumper wires to connect the selector pins to 5 V (i.e. The expansion board has 3 dip switches to set MS1 – MS3 high or low and on the CNC-shield you can install jumpers. I often use a CNC-shield or expansion board in combination with these drivers. ![]() MS1Īll three inputs have internal 100 kΩ pull-down resistors, so leaving the three microstep selection pins disconnected results in full-step mode. The resolution (step size) selector pins (MS1, MS2, and MS3) allow you to select one of the five step resolutions according to the table below. A4988 Specifications Minimum operating voltageįor more information you can check out the datasheet here. You can find more specifications in the table below. The A4988 driver chip has several safety functions built-in like overcurrent, short circuit, under-voltage lockout, and over-temperature protection. TB6600 Stepper Motor Driver with Arduino Tutorial.This driver can be used with the same code as the A4988 and has a current rating of 3.5 A. If you need to control larger stepper motors like NEMA 23, take a look at the TB6600 stepper motor driver. The driver has a maximum output capacity of 35 V and ± 2 A which is great for driving small to medium-sized stepper motors like a NEMA 17 bipolar stepper motor. This integrated motor driver makes interfacing with a microcontroller super easy as you only need two pins to control both the speed and the direction of the stepper motor. About the driverĪt the heart of the A4988 driver you will find a chip made by Allegro MicroSystems: the A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection. As an Amazon Associate we earn from qualifying purchases. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on. It makes wiring much easier and is a great option if you need a more permanent solution than a breadboard. ![]() Such a shield already includes capacitors and offers an easy way to select the microstepping resolution. ![]() ![]() I like to use this driver in combination with a CNC-shield or expansion board. Acceleration and deceleration example code Example code to control number of steps or revolutions Control number of steps or revolutions:.Basic Arduino example code to control a stepper motor.How to determine the correct stepper motor wiring?.Wiring – Connecting A4988 to Arduino and stepper motor.Differences between the A4988 and DRV8825.
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