If low pulse is sent then the A4988 will rotate the motor in anti-clockwise direction. If we send a high pulse to A4988 Direction pin then A4988 will cause the stepper motor to rotate in clockwise direction. The direction(DIR) pin is used to control the stepper motor direction. A longer step pulse will rotate the motor faster. The STEP signal controls the speed of the stepper motor Nema17. The Arduino uses these pins for stepper motor speed and direction control.Sending a high pulse from Arduino to STEP pin moves the motor one step. Next is the STEP and DIRECTION(DIR) pins of the A4988 driver. In our case we will tie them together.Īrduino Stepper Motor Speed and Direction Control
STEP MOTOR ARDUINO CODE DRIVER
When the reset is made active low then the A4988 driver is set to a predefined Home state until the reset goes high again. This happens because when sleep mode is activated the internal circuitry(output FETs, charge pumps, current regulator) are disabled and thereby power consumption is lowered. The SLEEP pin is used to drive the A4988 into sleeping mode in which case the driver will minimize power consumed by the driver. The ! SLEEP and !RESET pins (! meaning here active low) controls the sleep mode and the reset of the A4988 driver. Here we will use full step mode which means that the MS3, MS2 and MS1 pins of the A4988 driver are left unconnected because internally they are connected to pull-down resistors which keeps them at low level logic.
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