Close the Door

Project Number: 15

Description: Build the circuit shown. The slide and press switches (S5 & S2) control the lights.

Snappy: The "on" position of a switch is also called the "closed" position. Similarly, the "off" position is also called the "open" position. This is because the symbol for a slide switch is similar to the symbol for a door in an architect's drawing of a room:

The electronic symbol for a slide switch should be thought of as a door to a circuit, which swings things open when the switch is off. The "door" to the circuit is closed when the switch is on. This is shown here:

Your S5 switch has 2 positions, so it has a different symbol:

Open Switch (turned off)

Closed Switch (turned on)

Left Switch Position Open (turned off) Right Switch Position Closed (turned on), right LED controlled by press switch

Left Switch Position Closed (turned on) Right Switch Position Open (turned off)