How to Make Automatic Cabinet Lamp

How to convert cheap cabinet lamp from dollar store to work automatically

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We have a be nice policy.
Please be positive and constructive.

It was not more easy to use a limit switch?

Yes easier and durable. It is just a small DIY project I did to teach my kids circuits basics with basic tools.

I made one of these but it didn't work. Every time I opened the door to make sure that the light had gone off, it hadn't. :D

Seriously - nice project. I've got some garage cabinets where I'll try this idea.