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Sewing Tools and Supplies
Overall I like the project, but I have to advise against soldering directly to the batteries or tabs. Lithium batteries store a LOT of energy, and when they fail they are capable of reaching very high temperatures. Some of these batteries can easily be damaged by soldering heat. If somebody is interested in doing this project, I recommend that they buy the 18650 batteries with tabs and use appropriate connectors.
This IS a touch switch, even if you have to touch more than one wire at a time; it’s just that the capacitive touch switches that are more common nowadays give the impression to lots of people that a single electrode is the only “proper” configuration for a touch switch.What’s interesting to note is that the ability of the MOSFET to stay in either the ON or OFF state is due to the presence of gate capacitance coupled with a VERY high leakage resistance through the gate oxide layer.
Awesome project and a great write-up. It shows how much work often is necessary to end up with a quality result! The neatness of the finished assembly hides all the intricate work - kudos for accomplishing this AND sharing your trials and tribulations along the way!
Getting Started with Electronics
Nice project! You might want to edit the materials list to correct the plywood specifications for both panels/sheets: they are currently spec'd out as 1 x 8 feet, but should be 4 x 8.
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