Slide this dimmer back and forth to control your circuit. When the slider is all the way to the left, it’s sending an off or 0 volt signal. When the slider is all the way to the right, it’s sending a 5 volt signal. As you slide it up, more signal goes to the Bits that follow, brightening lights and speeding up motors. The slider can be positioned to send any signal between 0 and 5 volts.