DC motor drive experiment

DC motor drive experiment

Experimental phenomena

This experiment uses a small DC motor to drive L9110 to drive a small DC motor

Theoretical study

After wiring according to the above figure, the motor connected to the drive board can be controlled.

When A1.A2=0.0, it is stalled. When
A1.A2=1.0, it is forward rotation.
A1.A2=0.1 is reverse rotation.
PA is PWM wave input.
G is common ground pin.
The PWM frequency is up to 60KHZ and the duty cycle is up to 98%.

Schematic diagram

Code writing

int iapin = 6;
int ibpin = 5;
void setup() {
    
    
  // put your setup code here, to run once:
  pinMode(iapin, OUTPUT);
  pinMode(ibpin, OUTPUT);
}

void loop() {
    
    
  // put your main code here, to run repeatedly:
  //顺时针旋转
  digitalWrite(iapin, HIGH);
  digitalWrite(ibpin, LOW);
  /*
    逆时针旋转
    digitalWrite(iapin, LOW);
    digitalWrite(ibpin, HIGH);
  */
}