Making A Locket From A Coin

Some countries have strict laws around the destruction or alteration of issued currency, but then again, some countries don’t. Citizens of those in the latter category may enjoy undertaking a build similar to this locket created by [Elier Olivos], crafted from a large coin.

A compass is first used to mark out a line on the coin’s perimeter, before it is cut in half with a fret saw. Once the two halves of the coin are smoothed out, it’s then time to heat them and quench them so they’re more malleable for pounding into a slightly domed shape. Metal rings are then fabricated and added to each half to give the locket some depth.

A hinge is then carefully made and fixed into the edges of the coin halves, giving the closed coin an almost seamless outside appearance. A small latch installed on the inside helps hold the locket closed. The final touches are to attach a loop for affixing the locket to a chain for the wearer, and to polish the inside of the locket up to a mirror shine.

[Elier] makes the build look easy through a combination of his amazing skills with his hands and the help of a some esoteric tooling. It can be very relaxing to take in a video of a master at work, and we’ve seen some great examples recently. Video after the break.

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Is That A Rom In Your Locket?

[Andrew] recently ordered some lockets to bejewel them with some LEDs but got a bonus small locket for free with the order. Not really having a plan for the small locket it kind of sat around until finally some inspiration hit. Meet the ee-locket which contains a tiny circular pcb with a 64k eeprom, a few passive support components and a male pin header on the back so you can quickly plug it into the micro of your choice.

While the uses of such a thing may not be obvious at first, just sitting down writing this I thought of a few applications, such as some form of key and lock system, mission impossible dreams, or just going full out geek at your next job interview. Its a pretty spiffy idea no matter what its used for, and we just love it when people shove electronics where no one expect them.

Magic Locket

[Andrey] from RTFM has built himself a glowing LED pendant using only three parts and some simple code. The hack is not particularly complicated but [Andrey] provides some decent instructions on Pickaxe programming via an RS232 serial port and RGB LED control to produce the nice glowing effects. The pendant contains an RGB LED, a Pickaxe-08 microcontroller and a couple of button cell batteries. To cram everything inside the locket, [Andrey] had to grind down the LED and Pickaxe-08 to their minimum dimensions using a file.

All of the Basic code for the pendant is supplied on the project page and [Andrey] describes how he manages to PWM all three LED pins for the colour effects. The video after the break may be of interest to anyone who has not had a go at Picaxe programming before or for a beginner who wants to try out some new embedded devices without a big hit to the wallet.

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