CalebB57

Awesome! If you want to run that magnet at, or just under it's rated voltage you could use something like a 19v PSU from a laptop, then get buck converter to bring the input voltage down to around 5v for the microcontroller.

Thanks! It was a fun project to create.

I'm glad you like it. I will look into WebThings. I had never heard of it before. Sounds cool!

Thanks!

This would be really cool for an escape room! I hadn't thought about that.The mosfet really doesn't need the heatsink. I just had it, and thought I would put it on. It doesn't get hot at all. I'm not sure how many mA it draws. I will test it. It can't be that much though. This magnet works great, but it should never be powered with 12V. It gets way too hot with 12V.

I'm glad you liked it! An electric strike would be better in this case. I just got really fascinated with electromagnets, and wanted to do it all custom.

Thanks! You could do a battery backup easily, but this is just on an interior door. It's meant to stop people from wandering into my home office. It has actually impressed me how much I use it, and how well the knock code works.

haha. I just fixed that. I'm glad you liked it. I didn't really have a way to make the bracket out of metal at the time, but that would be a lot stronger.