My Ardumoto arrived yesterday, wired it up. All seemed fine until I tried to reverse MotorB. Both Motors work fine forward, MotorA works fine in both directions.
Both motors work aswell as the Arduino Uno and I am using Vin on the Arduino to power it (9v).
I am using the SparkFun demo code (below)
/*
6-29-10
Pete Dokter
SparkFun Electronics
This is an example sketch for Arduino that shows very basically how to control an Ardumoto
motor driver shield with a 5V Arduino controller board (3.3V may work, but it's out of spec
for the L298 H-bridge logic, so no promises). If you're plugging the Ardumoto into an
Arduino Duemilanove or similar, all the connections are done for you and you can just rewrite
the examples in this code to your liking.
*/
int pwm_a = 10; //PWM control for motor outputs 1 and 2 is on digital pin 10
int pwm_b = 11; //PWM control for motor outputs 3 and 4 is on digital pin 11
int dir_a = 12; //direction control for motor outputs 1 and 2 is on digital pin 12
int dir_b = 13; //direction control for motor outputs 3 and 4 is on digital pin 13
void setup()
{
pinMode(pwm_a, OUTPUT); //Set control pins to be outputs
pinMode(pwm_b, OUTPUT);
pinMode(dir_a, OUTPUT);
pinMode(dir_b, OUTPUT);
analogWrite(pwm_a, 100); //set both motors to run at (100/255 = 39)% duty cycle (slow)
analogWrite(pwm_b, 100);
}
void loop()
{
digitalWrite(dir_a, LOW); //Set motor direction, 1 low, 2 high
digitalWrite(dir_b, LOW); //Set motor direction, 3 high, 4 low
delay(1000);
analogWrite(pwm_a, 255); //set both motors to run at 100% duty cycle (fast)
analogWrite(pwm_b, 255);
delay(1000);
digitalWrite(dir_a, HIGH); //Reverse motor direction, 1 high, 2 low
digitalWrite(dir_b, HIGH); //Reverse motor direction, 3 low, 4 high
delay(1000);
analogWrite(pwm_a, 100); //set both motors to run at (100/255 = 39)% duty cycle
analogWrite(pwm_b, 100);
delay(1000);
}
