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.

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.

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.