Technical summary
This driver based on the A4988 circuit allows a bipolar stepper motor to be controlled from a PWM output (step speed) and a digital output (direction of rotation) of a microcontroller (Arduino, Seeeduino, etc).
Three inputs allow the operating mode to be selected (full step, half step, quarter step, 1/8 step or 1/16 step). A potentiometer allows the output current to be adjusted (it must not exceed 70% of your motor's rated current).
Notes:
- do not disconnect/connect a motor while the module is powered (destruction of the module)
- significant heating of the integrated circuit is possible and normal during operation
Power supply:
- logic section: 3 to 5.5 Vdc
- motor section: 8 to 35 Vdc
Output: 1A per phase (2A with heatsink)
Protections against:
- overcurrent
- excessive temperatures
Dimensions: 21 x 15 x 3 mm
