Seeed Technology Grove I2C Motor Driver, Руководство пользователя

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6.2 How to drive 2 DC motors
Note:
The first thing to notice however, is that you need an external power source for your DC motors. The 5v pin
on the Arduino cannot provide enough power to drive 2 motors, you may damage your Arduino if you do
so.
And then program your Arduino as below:
#include <Wire.h>
.......
.......
< Driver functions >
.......
.......
void setup () {
Wire . begin (); // join i2c bus (address optional for master)
delayMicroseconds ( 10000 ); //wait for motor driver to initialization
}
void loop () {
while ( 1 ) {
MotorSpeedSetAB ( 100 , 20 );
delay ( 10 ); //this delay needed
MotorDirectionSet ( 0b1010 ); //0b1010 Rotating in the positive direction