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== Activities ==
[[Image:SPST_circuit.png | 300px]]
=== Selector Switch ===
* With the ridiculous knife switches available in class, build a simple "selector switch" that turns on one of two bulbs:
[[Image:SPDT_bulbs.png | 300px]]
=== AND gate ===
* Build an AND gate and verify its behavior (by drawing and completing a truth table similar to those from lecture):
[[Image:AND_circuit.png | 300px]]
=== OR gate ===
* Build an OR gate and verify its behavior (with a truth table):
[[Image:OR_circuit.png | 300px]]
=== Relay ===* Familiarize yourself with the 5V relay, using the data sheet [[http://relays.tycoelectronics.com/datasheets/T77_DS. pd]]
** Which pins go to the coil?
** Which pins are the contacts that get switched?
[[Image:One_pixel.png | 300px]]
* Congratulations You have built yourself one bit of digital memory and simple digital display!
=== Logic, generally ===
* Now, returning to the idea of logic, label one side of a knife switch "TRUE" and the other side "FALSE".
* Working in small groups, use multiple knife switches (say five or more) and build a circuit that responds to a complex input. For instance, my circuit has five switches ("A" through "E") and one Light Bulb ("O"). The lighbulb, O, only turns on if switches A, C, and D are True, and switches B and E are false.