2019-12-02 (M) MIDIGlocken

While I wait to hear from tech support about my printer, I can work on the control electronics. For starters, I will control power to the solenoids with mechanical relays. Eight-relay modules exist, and I had a couple of them in stock. The click of the relays may be distracting, which may necessitate switching to a solid-state relay bank in the future. An Arduino mounted right on the relay bank pins, except a wire for Vcc, which ran separately.
Arduino with soldered header sockets

On the contact side of the module, I daisy-chained a power line to the common terminal of each relay. I added a different wire to the normally-open terminals. One of the terminal screws stripped, so I soldered a jumper between the normally-closed terminal and common so all the wires could land under a screw post. I put a snug layer of shrink tube over everything, but this was a mistake because I did not add a ground wire to the bundle.
Power wires and ill-advised shrink tube

First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6

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