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You'll need a low voltage detection switch to turn it off when a Lipo's power falls to 50%. Might be some kind of diode, like a zener type. Lipos are severely damaged by allowing them to completely discharge. Keeping them fully charged when not in use is bad for them as well. If you insist on using...

Further to rmcingle’s point about residual magnetism, I would also point out that solely relying on the battery to discharge as a safety mechanism is not without issues, as LiPo batteries do not like being over discharged. Could be dangerous if they throw a tantrum while you’re bound. You could use ...

Basically yes. Broadly speaking the inductance of the coil means how much it resists a change in voltage. (Note I'm simplifying things a lot there, but as they say, it's good enough for the girls I go out with) Haha, a fan of Ave I see! Inductance resists a change in current, not voltage I think. T...

A possibly more accurate way to detect the magnet closing is measuring the inductance of the magnet coil. Fellow forum user Onwrikbaar has made one or two posts about this (See this one with the most information I think) It’s coming back to me now that I had seen that before. The guy’s a legend. A ...

The drop in current is because "back EMF" is generated when the plate moves freely in the magnetic field. Just like with a motor: with no load, the motor current is small and the motor will turn at the rate where the back EMF cancels out the drive voltage. The freely moving magnet/metal a...

Just discovered something useful I wanted to share. I use an electromagnet controlled by an Arduino to "tie the last hand". However, it's a bit clumsy to just add a delay between the time the Arduino is powered on and the time everything is done and I can drop the plate on the magnet befor...

How about going further than simply on or off? First take a look at this informative and hilarious video: https://youtu.be/fyuv3WXPQsM I got a cheap knockoff from the usual suspects and stripped the insides to replace the AC-DC with arduino based controls. An external power source and a transistor c...

The strike plate is a stack of large washers with a countersunk screw through the middle and an eyenut on the other side. While this works, unfortunately the magnet just isn't strong enough and I can pull the strike plate off with my hands. It could work with some added mechanical advantage . It do...

I saw another build today, that uses a peristaltic pump to adjust the air volume. I really like that idea, because i can control it with the NodeMCU board and i should be pretty precise. What about the volume? The ones I saw on aliexpress were pretty dismal, around 400ml per minute, which might sev...