Pertinent RiPi LED links:
Project 1: get a functioning LED on GPIO pins utilizing command line approach
Project 2: replicate functionality, in a C program
Project 3: rig up 4 LEDs, write a C program that makes a binary counter with the LEDs
Project 4: wire together 2 RiPis— one “counts” and sends the signal to its peer, its peer receives signal and outputs to LEDs accordingly
Project 5: telegraph– utilizing an external switch, one RiPi sends signal to another, which lights up its LED
Project 5 overdrive: rig up contact switch for authentic morse code reception (simple electromagnet?)
Project 6: telegraph translation: in addition to lighting up the LED, parse the incoming message and display (character at a time) to STDOUT
Project 6 redux: long distance telegraph– run a much longer cable… send and receive telegrams from across the room (or hall).
Project 7: contemplate a telegraph network… how would we enable a sender to select a recipient and send a message? (think about switching and relaying)