What is it?

This stepper Motor driver arduino shield had three build-in A4988 stepper motor driver IC, which allow you driver three different stepper motors independently. We used high quality SPF 3.5mm pitch terminal for stepper motor connection, the male header side has screw socket, which can provide more reliable connection for the whole project. Also the boards has potentiometer to control the current, jumper for signal mode, and DIP switch for step resolution.

The A4988 is a complete microstepping motor driver with built-in translator for easy operation. It is designed 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 A4988 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes.

Features:

• Easy and fast to step up the stepper motor project, especially for 3D printer project.
• Three built-in A4988 motor driver IC
• Each driver circuit has a potentiometer to control the maximum output current, a DIP switch to switch the step resolution, easy to to control step rate.
• Low RDS(ON) outputs
• Automatic current decay mode detection/selection
• Mixed and Slow current decay modes
• Synchronous rectification for low power dissipation
• Internal UVLO
• Crossover-current protection
• 3.3 and 5 V compatible logic supply
• Thermal shutdown circuitry
• Short-to-ground protection
• Shorted load protection
• Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16

Specification:

• Load Supply Voltage(VBB): 8-35V
• Logic Supply Voltage(VDD): 3.0-5.5V
• Reference Voltage: 5.5V
• Output On Resistance: 320-430m OHM at each driver
• Body Diode Forward Voltage: 1.2V at each driver
• Output Current: ±2A at each driver
• Arduino Compatiable: Yes
• Dimension: 6.8x5.2cm(same as Arduino)
• Weight: 0.02kg

Interface:

• Power +: 8v-35v
• Power -: GND
• 2B: Stepper motor’s 2B
• 2A: Stepper motor’s 2A
• 1B: Stepper motor’s 1B
• 1A: Stepper motor’s 1A
• Mode selector: MS1、MS2、MS3 (ON -> GND)
• PWR selector: Connect the power from arduino to module
• DIR/STEP selector: Connect the DIR/STEP to Dx or Dx
• Potentiometer : Adjust the PWM current limitation:
• a.Clockwise to go MAX
• b.Anticlockwise to go MIN

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