DIY electromagnet based time-lock devices

[lovesagoodhogtie]

Hi all,

I am looking for someone with arduino experience / electrical engineering experience. I want to make a magnet based self bondage cuff similar to the Magbound (https://selfbondage-shop.com/products/ma...time-14563) but without the wire. I tried a bit myself, but I am not well versed in hardware (I am a professional software developer though).

The idea is simple, take a magbound, remove the wire and replace it with a battery pack and an Arduino. As such, you have a very small mobile device which you can use for any sort of bondage. Using a battery, similar to the Magbound, allows automatic release when the batteries run out.

To add some fun, I thought about adding a mini arduino inside the 3d-printed housing to allow remote control. This arduino could be used to power-up and power-down the magnet using bluetooth, wifi, or a built-in timer.

I saw a similar idea on etsy once, but I can't find it anymore. I downloaded the images though:
   
   

Is there any electrical engineer / arduino expert who can help me with the electrical schematics? Maybe we could co-produce a test version?

I have no intention of selling this. Rather, I would like to make the final design open source for anyone to assemble.

Let me know if there is interest / help.

[lovesagoodhogtie]

hi all, thanks for all the replies!

I like Ra's idea of using a simple chip device as a relay. It is certainly the cheapest. The downside is that you can't program them. My idea was that as soon as it becomes software it becomes easy. Also, I was thinking of adding a load cell to one end of the magnet (can't find a cheap one now, something like this: https://s.click.aliexpress.com/e/_DmrChTr ). The idea would be to program it such that if you pull while the timer has not run out, it adds a few minutes.

This was also a very useful piece of information from Lancer: "As for controls ... need a mosfet of choice. ...  ". Any chance you could draw me a schematic?

The magbound is indeed on 12v, 11watt (disassembled one, it appeared to be this one: https://s.click.aliexpress.com/e/_Dk0f9qH ). USB port is indeed 5 volt. This means that the holding force will be less than at 12v. Instead of 60kg, somewhere around 30, on top of my head. I saw a graph somewhere online (can't seem to find it now).

As controller I did some research. This one seems nice: https://esp32s3.com/tinys3.html . Small, and built in wifi and bluetooth. 😊