Switches
These kinds of switches are often found in our house hallway or at the top and bottom of a flight of stairs. They are so convenient and let us turn it on or off at either way.
If the LED is on, flipping either of the switches will turn it off. If the LED is off,
either of the switches will turn it on.
The upper yellow jumper wire is connected to two outer switch terminals, the lower yellow jumper wire is connected to the other ends of two terminals.
The left side switch blue wire is connected to ground. The negative pin of green LED is connected to the pole (middle pin) of the right switch. The positive pin of green LED is connected to a 270Ω resistor (or a 220Ω resistor) and the other side of leg is connected to the 5V positive power supply; this makes the complete circuit for testing.
The center terminal is the pole of the switch because
you can flip, or throw the switch to make two possible connections: when you flip the toggle, the pole changes its connection. It connects the center terminal with one of
the outer terminals. Flip the switch back, and it connects the
center terminal with the other outer terminal,
it is called a double-throw switch
(SPDT).
No comments:
Post a Comment