void loop()
{
  state = (digitalRead(7) << 1) | digitalRead(5);
  if (state != prevstate) {
    if (state == nextEncoderState[prevstate]) {
       count++;
    } else if (state == prevEncoderState[prevstate]) {
       count--;
    }
    Serial.println(count, DEC);
    prevstate = state;
  }
}