readPin(): When.Promise<GpioState> {
     const state = this.gpio.readSync() ? true : false;
     return When.resolve({
         timestamp: new Date(),
         bcmPinNumber: this.bcmPinNumber,
         state: state
     })
         .tap((state) => console.log(JSON.stringify(state, null, 4)));
 }

 writeToPin(newState: boolean): When.Promise<GpioState> {
     this.gpio.writeSync(newState ? 1 : 0);
     return this.readPin();
 }

export function getStatus(pin: number): number {
    const target = new Gpio(pin, 'out');
    let status = target.readSync();
    target.unexport();    
    return status;
}

export function turnOff(pin: number): void {
    const target = new Gpio(pin, 'out');
    target.writeSync(OFF);
    target.unexport();
}

export function toggle(pin: number): void {
    const target = new Gpio(pin, 'out');
    target.writeSync(target.readSync() === OFF ? ON : OFF);
    target.unexport();
}

var toggleLed = function():void {
    var lastState:number = led.readSync();
    led.writeSync(lastState ^ 1);
};

setTimeout(function() {
    clearInterval(intervalId);
    led.writeSync(0);
    led.unexport();
}, 2000);