cool demo for stm32f4discovery/Espruino

Update for Espruino board since it only has 3 lights... Also added ability to stop and restart it. Change the value of i to control how fast the lights change (in milliseconds), by default run=true, setting to false will stop it. You can now resume by setting run=true again. Enjoy!

var i = 1000, run = true;
function flashLights() {
    LED3.write(false);
    LED1.write(true);
    setTimeout(function () {
        LED1.write(false);
        LED2.write(true);
        setTimeout(function () {
            LED2.write(false);
            LED3.write(true);
            setTimeout(function () {
				if (run) {
					flashLights();
                } else {
                  var checkForRestart = setInterval(function () {
                    if (run) {
                      clearInterval(checkForRestart);
                      flashLights();
                    }
                  }, 500);
                }
            }, i);
        }, i);
    }, i);
}
flashLights();