int stimTime = 0;

void rectangularStim(int intensity, int stimTime) {
      if (t%(4*stimTime) < stimTime) { 
        arduino.analogWrite(down, intensity);       // Turns on arduino light (can make ledPin into a parameter that is passed in)
      } else {
        arduino.analogWrite(down, 0);
      }
      
      if (t%(4*stimTime) >= stimTime && t%(4*stimTime) < 2*stimTime) {
        arduino.analogWrite(left, intensity);
      } else {
        arduino.analogWrite(left, 0);
      }
      
      if (t%(4*stimTime) >= 2*stimTime && t%(4*stimTime) < 3*stimTime){
        arduino.analogWrite(up, intensity);
      } else {
        arduino.analogWrite(up, 0);
      }
      
      if (t%(4*stimTime) >= 3*stimTime && t%(4*stimTime) < 4*stimTime){
        arduino.analogWrite(right, intensity);
      } else {
        arduino.analogWrite(right, 0);
      }
      
      t_temp = t_temp + 1;
      t = t_temp / FrameRate;
}