Keyestudio Smart Little Turtle Robot V3 Manual page 161

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pinMode(right_ctrl,OUTPUT);//set direction control pin of B motor to
OUTPUT
pinMode(right_pwm,OUTPUT);//set PWM control pin of B motor to
OUTPUT
pinMode(sensor_l,INPUT);//set the pins of left line tracking sensor to
INPUT
pinMode(sensor_c,INPUT);//set the pins of middle line tracking sensor to
INPUT
pinMode(sensor_r,INPUT);//set the pins of right line tracking sensor to
INPUT
}
void loop()
{
tracking(); //run main program
}
void tracking()
{
l_val = digitalRead(sensor_l);//read the value of left line tracking sensor
c_val = digitalRead(sensor_c);//read the value of middle line tracking
sensor
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