Image | Date | Progress |
| 2013-11-07 | 9-volt version cobbled together prior to Make-A-Thon, but nothing further |
| 2015-11-14 | 3-volt version cobbled together prior to Make-A-Thon |
No image | 2015-11-26 | Laser-cut different boards because I didn't want to etch an actual PCB |
| 2015-11-27 | 4 completed in 5 hours during Make-A-Thon |