The A4988 Stepper Motor Driver is a low cost high power motor driver IC that can be used for many applications. However, the amount of current supplied to the motor is determined by the power supply, cooling system, and current limiting setting of the system. On the output pins small to medium size NEMA 17 motors can be connected Each output pin can supply up to 2A to the motor. Home state is basically the initial position from which the motor starts, and it varies based on microstep resolution.ġB, 1A, 2A, 2B The output channels of the A4988 motor driver are broken out to the side of the module with pins. It also resets the driver by setting the internal translator to a predefined “home” state. When this pin is pulled LOW, all STEP inputs are ignored. You can use this to save power, especially when the motor is not in use. Pulling this pin LOW puts the driver into sleep mode, reducing power consumption to a minimum. This pin is particularly useful when implementing an emergency stop or shutdown system. By default, this pin is pulled low, so unless you pull it high, the driver is always enabled. When this pin is pulled LOW, the A4988 driver is enabled. Pulling it HIGH turns the motor clockwise, while pulling it LOW turns it counterclockwise.ĮN is an active low input pin. The higher the pulse frequency, the faster the motor will spin.ĭIR input controls the spinning direction of the motor. Each HIGH pulse sent to this pin drives the motor according to the number of microsteps determined by the microstep selection pins. STEP input controls the microsteps of the motor. These three microstep selection pins are pulled LOW by internal pull-down resistors, so if you leave them unconnected, the motor will operate in full step mode. The A4988 driver has three step size (resolution) selector inputs By setting the appropriate logic levels for these pins, we can set the motor to one of five step resolutions. MS1, MS2, MS3 Microstepping resolution select pins. According to the datasheet, the motor driver requires a suitable decoupling capacitor close to the board. VMOT Motor Supply pin gives power to the motor, which can range from 8V to 35V. The A4988 module has two ground pins(9,16). GND The ground pin of the module connects to the ground pin of the Arduino. VDD This is the power pins of the Module, the VDD pin powers the internal logic circuit. The A4988 Module has a total of 16 pins that connects to the stepper motor and the Arduino, The pinout is as follows The gif above shows you how the motor works A4988 Stepper Motor Driver Pinout This allows you to control a bipolar stepper motor, such as the NEMA 17, at up to 2A output current per coil. The A4988 stepper motor driver has an output drive capacity of up to 35V and ☒A. Each HIGH pulse energizes the coil, attracting the teeth closest to the cogged wheel and driving the motor one step forward. Stepper motors use a cogged wheel and electromagnets to rotate the wheel one ‘step’ at a time. How A4988 Stepper Motor Driver Module Works So without further ado let's get right into it. After that, we'll dive into the code, where we'll show you how to control the stepper motor's direction, speed, and number of steps. We'll then go over the wiring connections between the A4988, the stepper motor, and the Arduino. We'll start by discussing the basic principles of stepper motors and the A4988 driver module. In this guide, we'll go over how to control a stepper motor with an A4988 driver and an Arduino UNO. When combined with an Arduino UNO microcontroller, the A4988 can be used to control a stepper motor in a highly precise and efficient manner. The A4988 driver is a versatile stepper driver for controlling stepper motors for various applications. A stepper motor is a type of brushless DC motor that divides a full rotation into a number of steps, thus allowing for precise control of the motor's position.
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