ImpulseDetectionSimple

//this is my example for Amperka L298P shield
//this code placed on Pastebin
#define RH_ENCODER_A 4 //specially not interrupt pins
#define RH_ENCODER_B 5

bool A = 0;
bool new_A = 0;
bool new_B = 0;

void setup() {
  pinMode(RH_ENCODER_A, INPUT);
  pinMode(RH_ENCODER_B, INPUT);
  Serial.begin(9600);
}

void loop() {
  new_A = digitalRead(RH_ENCODER_A);
  new_B = digitalRead(RH_ENCODER_B);
  if (A != new_A) {
    Serial.print("port A = ");
    Serial.println(new_A);
    Serial.print("port B = ");
    Serial.println(new_B);
    Serial.println();
    A = new_A;
  }
}