push buttons must be held down to turn them on or off.

To build this I would use the following arduino code to play with it.

int led = 13; // the pin that the LED1 is attached to

int led2 = 9; // the pin that the LED2 is attached to int brightness = 0; // how bright the LED is int fadeAmount = 5; // how many points to fade the LED by

// the setup routine runs once when you press reset: void setup() { // declare pin 9 to be an output: pinMode(led, OUTPUT); pinMode(led2, OUTPUT); }

// the loop routine runs over and over again forever: void loop() { // set the brightness of pin 9: analogWrite(led, brightness); analogWrite(led2, brightness*-1);

// change the brightness for next time through the loop: brightness = brightness + fadeAmount;

// reverse the direction of the fading at the ends of the fade: if (brightness == 0 || brightness == 255) { fadeAmount = -fadeAmount ; } // wait for 10 milliseconds to see the dimming effect delay(10); }