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Make wristbands that can sense eachother? Answered

so basically i need to create something that makes it look like two wristbands have connected wirelessly to eachother, just like how you connect things with blue tooth. I want to make two wristbands that have circuits in them so that when they are close to each other, a light turns on on both of them, or something to that effect. would someone be able to tell me how to do that? please thank you

6 Replies

Maker Saga (author)2017-04-29

I don't know how to help, but that would be awesome if you make an instructable about this once you figure it out! It would be neat to partner with social events coordinators so each guest gets one at the entrance!

It sounds like you are trying to make something like Alike.io or GoVibe, which are both wristbands that light up when people with similar interests are nearby. Like a friend finder without GPS.

GoVibe failed on indiegogo and alike.io website is down. I think they were unable to compete with software apps that do the same thing but have to downside of lacking the convenience of a wrist watch. I suppose people more easily join using existing apps instead of buying hardware. Large user base existing instead of making from scratch. All facebook (proximity friend finder feature) and other friend finder apps would have to do is add smartwatch integration to their existing apps. There used to be a app that was more privacy friendly that used BLE instead of GPS and servers called NowyFriends, but that website seems to be gone too. I wish you the best!

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iceng (author)2017-04-20

A proximity - sensing pocket square ible, may be too complicated for your skill set..


A best fit for your question.

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rickharris (author)2017-04-20

Over what sort of distance.

Beyond the magnet and reed switch idea (needs to be very close) most others will use microprocessors and need some programming skills.

Ultra sonic

Wireless radio link

Blue tooth etc.

You can develop these but it won't be an instant process.


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Yonatan24 (author)2017-04-19

Magnet, and a switch that's activated by a magnet in each one?

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Jack A Lopez (author)2017-04-19

I suggest using asynchronous serial over infrared.

These two Wikipedia pages, explain how asynchronous serial works:



I am hoping that someone has written a tutorial on how to do this.

A search for, "uart over infrared" seems like a good place to start,


By the way, the what they call, "physical layer", does not have to be light, or radio waves, or electric current. Sound could work as the physical layer.

Although it might be kind of annoying to have to hear (with your ears) the sound of these wristbands squawking at each other, or to have to listen to the lonely sound of one solitary wristband, periodically crying its greeting signal, with no other wristbands nearby to hear it.

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Orange robot (author)2017-04-19

I think you should try using an ultrasonic distance sensor

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