Week 2: Switches September 22, 2017 in Physical Computing Switches Two switches in parallel.Pressing either one will close the circuit and light the LED. Two switches in series. Press both to light the LED. Three switches in series with three LEDs at different locations.How to light them? Press the first button the first LED. Press the second switch for the first and second LED. Press all three for to light all three! This circuit uses a switch to activate a motor when pressed. Because it's a dual pole switch, it can potentially effect more than one load when the circuit is closed.