Control Method

IN1 IN2

ENA/ ENB

Motor1/2 Behavior

0

0

x

Stop (brake)

1

1

x

Vacant

1

0

1

Forward 100%

0

1

1

Reverse 100%

1

0

PWM

Forward at PWM speed

0

1

PWM

Reverse at PWM speed

In this table



IN1 & IN2: the control signal input to change the motor behavior



"0": TTL_Low



"1": TTL_High



"x": Any TTL, and it is default TTL_Low while no PWM signal.



"ENA/ ENB": PWM speed setting

Note:

IN1 & IN2

To protect your motor, before switching the motor steering direction, make sure firstly to

BRAKE motor by setting IN1 - 0 & IN2 - 0, especially when the PWM was set as 100%,

full speed. And the suggestion time to brake is >0.1S, depending on your motor.

+5V

When the microcontroller operation voltage is 5V/3.3V, then please connect the reference

voltage 5V/ 3.3V from the microcontroller. Or you will fail to control motors.

Tutorial

This tutorial will cover how to use PWM to control a motor using the shield. Do the wiring according

to the Connection Diagram below, and then upload the sample code below to the Arduino card, here

we use a arduino UNO as the controller, you could see your motor run forward for 3 second and

then run reversely for another 3 seconds and repeat this behavior then.