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→Relay
[[Image:OR_circuit.png | 300px]]
=== Relay ===
* Familiarize yourself with the 5V relay, using the data sheet [if you are stuck [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".
