#define AIN1 0
#define AIN2 1

int i = 0;
int down0 = 0;
int down1 = 0;
int color = 0;
int rate = 250;

void setup() {
  pinMode(AIN1, OUTPUT);
  pinMode(AIN2, OUTPUT);
  analogReadResolution(8);
}

void set_color() {
  if (i % (2 * rate) < rate) digitalWrite(AIN1, LOW), digitalWrite(AIN2, LOW);
  else {
    if (color) digitalWrite(AIN1, HIGH), digitalWrite(AIN2, LOW);
    else digitalWrite(AIN1, LOW), digitalWrite(AIN2, HIGH);
  }
}

void loop() {
  if (i % rate == 0) set_color(); // Toggle color
  
  // Make sure this is a press and the button isn't already down
  if (analogRead(A0) > 200) {
    if (!down0) color = !color, set_color();
    down0 = 1;
  }
  else down0 = 0;
  if (analogRead(A1) > 200) {
    if (!down1) rate = (rate == 250 ? 500 : 250), set_color();
    down1 = 1;
  }
  else down1 = 0;
  
  delay(1);
  i++;
}