Scrapyard challenge as the name of the workshop says, was a big challenge for me because it was the first time I’ve ever created an electrical circuit which actually worked.  We were expected to make a switch for a musical controller, and at the end connect it to an arduino board which was plugged in to the MIDI software. Our team created instruments for a band that included a guitar,  bass, drums, and a turn table.  Bass guitar that I worked on was formed out of, three separate conductor wires passing through the junk that I’ve found, and a plectrum as the switch. Used lots of aluminum foil for making the plectrum. Whenever the plectrum touched the conductor wires, MIDI software created musical sounds.