# Create an Electric Device that Lights Up 2 Feet Away | DIY Guide

• umaga
In summary, the conversation discusses the need to create a device that will light up two light bulbs when they are far apart (more than 2 feet) and turn off when they are close. Possible solutions include using a string and pin to create a short circuit, using sound or laser positioning devices, or simply placing the light bulbs on a conductive plate.
umaga
i need to make a device but don't know how
it is 2 lightbulbs, when they are far away, (more than 2 feet), then one or both of them should light up. if they are close, they should both turn off.
any idea how i can do this?

Since both light bulbs need to be connected to a power source anyway, you can connect them linearly and add a string and pin, two feet in length, which would short circuit the two. If the light bulbs move to more than the length of the string from each other the string would disconnect and thus there will be light!

Of course you meant, without direct contact between the two, but I couldn't resist the obvious solution. You can also use positioning devices that works on sound, which would calculate the distance by measuring the time under a constant velosity. You can also use a common laser and a small mirror and mesure the shift. Are these good for you?

Welcome to PF, Umaga.
You could simply place a conductive plate on the table. When both lamps are in contact with it, the circuit is closed; when one isn't, darkness.

## 1. How does the electric device light up objects from 2 feet away?

The electric device uses a principle called electromagnetic induction, where an electric current is induced in a conductor when it is placed near a changing magnetic field. In this case, the device produces a changing magnetic field that induces a current in the object, causing it to light up.

## 2. What materials are needed to create this electric device?

The materials needed include a power source (such as a battery), copper wire, a magnet, a switch, and a light bulb. Optional materials include a circuit board, soldering iron, and various tools for assembly.

## 3. Can this electric device be made without any prior knowledge of electronics?

While it is helpful to have some basic knowledge of electronics and circuits, this device can be made with step-by-step instructions and guidance. It is important to follow safety precautions and always seek help or guidance if needed.

## 4. How long does it take to create this electric device?

The time it takes to create this device will vary based on individual skill level and familiarity with electronics. It could take anywhere from a couple of hours to a few days, depending on the complexity of the design and the materials used.

## 5. Can this electric device be modified or customized?

Yes, this device can be modified or customized to fit specific needs or preferences. Different materials, components, or designs can be used to create a unique electric device that lights up objects from 2 feet away.

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