Electromagnet Controller

 The Restraint

In this context, simple is always better. The less moving parts our design has, the easier it is to build and the less chances it has of getting stuck somehow. For this reason, we will be adopting a classic approach that can be found on the internet: An electromagnet.

Unfortunately, we’ve only seen some very unappealing uses for them. As we find esthetics to be important, even in self-bondage, we wanted to find ways to integrate them discretely into bondage. As time goes on, we will find different ways of doing so, depending on the bondage context. For now, we will stick to integrating the release mechanism to the bondage bed project.

In order to integrate the electromagnet into the bondage bed, we will use the electromagnet to hold one end of the wrist strap and will continue to use a ring device to tighten the other. In order to restrain yourself, loosen the strap in the ring device, slide your wrist into the loop and pull on the loose end of the ring device. If the rings are out of reach, it becomes impossible for you to get free until the electromagnet shuts off. When that happens, you will have 6 inches of slack in the strap, allowing your hands to get free.

BondageBedCutView

For safety reasons, one release mechanism per wrist should be used. Although unlikely, should anything go wrong with one device the other hand can still get free.

 


 The Mess Maker

The easiest and most flexible way of making a mess is to use a pump. Drop a submersible pump in a bowl of water and run its pipe line to your favorite something in another container. We will design the control system such that calling for an early release will inevitably result in the pump turning on and your something being destroyed. Its perfect motivation for most normal self bondage situations, but will not cause any hesitation should there be an eminent danger.

Here are suggestions as to sacrificial objects:

  • A cellphone
  • A laptop
  • An expensive rug
  • A wallet

 


 The Brains

The behavior we are looking to implement for this device is fairly simple. There is a timer, one or more emergency buttons, a set of electromagnets and a pump. Once the timer is started, we want the electromagnets to be energized. Should the timer run out, we want the magnets to loose power. Should one of the emergency buttons be pressed for even an instant, we want the magnets to loose power indefinitely and the pump to turn on.

Fortunately, the design is simple. It revolves around a relay and a start button. For those of you who may not be familiar with a relay, its function is fairly simple: it is an electrically operated switch. When the coil of the relay is energized, the switch is flipped one way, when the coil is not, the switch is flipped the other. In this design, the relay will self energize. Essentially, it will keep itself flipped, all while powering the set of electromagnets. Should the relay loose power, the relay will switch the other way, turning on the pump and causing a mess. Therefore, the emergency buttons will be used to cut off power to the relay and the magnets.

The schematic for this system is the following

Timelock_schematic

Here are a few notes on the drawing:

  1. Only one 120V timer has been illustrated. It is a good idea to use two in series such that should one fail, the other will still be capable of cutting off the system.
  2. The start switch is used to power on the electromagnets. By default, the pump is turned on.
  3. If the power flickers, this version of the device will act as though the emergency switch had been pushed, turning on the pump. A solution to this problem is to add a second relay on the 12V line which is self latched. Loosing power would then cause the entire system to remain powered off, whether the power comes on again or not.
  4. As illustrated, the system is not fused. Therefore, you have to be sure that the 12V power supply can handle all electrical faults. If in doubt, add a fuse at the output of the 12V power supply.

Here is a suggested part list for the project. You will be able to find most of these locally as well

 

What it looks like

The bondage bed itself:

TheBed_TheBed

The electromagnet used to hold the strap tight for the bondage bed project:

Locked

The electromagnet after release. The submissive can pull the strap through the bed therefore allowing him/her to get free:

unlocked

The electronics prototyped for the first time. It’s a small and compact setup which is easy to put together with basic electronic skills. There are two relays as the variation proposed above was applied.

electronics

The infamous MessMaker. Simply a bowl filled with… whatever you’d like and a small pump ready to pour its content onto the floor, a phone, a laptop, etc.

messmaker