Light Up Bracelet – Dead-bug style


Who doesn’t like blinking LED’s – especially when you link them to some sensory input such as Sound, for example. My maker friend Sohil Patel dished out a sound activated LED bracelet in time for Navratri, our nine day festival of Dance. He put up an instructable showing how he used a couple of simple parts to rig it all up – read about it here : [https://www.instructables.com/id/DIY-Wearable-Clap-Lit-Bracelet/](https://www.instructables.com/id/DIY-Wearable-Clap-Lit-Bracelet/ "https://www.instructables.com/id/DIY-Wearable-Clap-Lit-Bracelet/")

I thought it was something Samata would enjoy since she loves to dance, particularly during Navratri. Sohil’s diagram didn’t look alright – the LED anodes and the [+] of the battery are shown conected to GND, and when Q2 turns On, the LED’s get connected to GND on both sides (anode and cathode). Just the excuse I needed to crank up my favourite EDA program – KiCad – and churn out a corrected circuit.

![schematic of sound activated LED Bracelet](/assets/images/soundLED-650×490.png)

But why would I want to make a PCB for a circuit that uses just a handful of parts. No Sir, I decided to ditch using any kind of PCB, and make it “Dead-bug” style. Dead-bugging is an art by itself. See below some examples of functional and non-functional deadbug sculptures.

I soldered all the parts (2 transistors, 1 resistor, 1 trimpot, and the Mic) directly to each other, and then carefully wrapped the whole thing is a bit of kapton tape I had lying around (there’s only so much you can use for a 3D printer heated bed). I fashioned the eight 10mm blue LED’s in a long, parallel chain and hooked them to the “dead-bug” with short lengths of flex wire. Sohil originally used coin cells for his bracelet, but I had none lying around. Digging in to my part’s box, I came up with a LiPo cell rated for 8 Wh – enough to last a really long time. Here’s a video of the braclet on my ugly arms. [NOTE : Although I added a 10nF capacitor at the base of Q1 in the schematic, I didn’t finally use it in order to use one less part].

Deadbugging can be fun, and with some patience, you can create really nice, functional circuits or electronic art too.

[https://hackaday.com/2011/08/06/dead-bug-arduino-is-still-breadboard-ready/](https://hackaday.com/2011/08/06/dead-bug-arduino-is-still-breadboard-ready/ "https://hackaday.com/2011/08/06/dead-bug-arduino-is-still-breadboard-ready/")

[https://www.digitalfanatics.org/2012/12/amazing-freeform-arduino/](https://www.digitalfanatics.org/2012/12/amazing-freeform-arduino/ "https://www.digitalfanatics.org/2012/12/amazing-freeform-arduino/")

[https://www.artstudiopoint.com/home-improvement-category/insects-twisted-together-from-electronic-components](https://www.artstudiopoint.com/home-improvement-category/insects-twisted-together-from-electronic-components "https://www.artstudiopoint.com/home-improvement-category/insects-twisted-together-from-electronic-components")

[https://www.funnyjunk.com/funny_pictures/4285058/electronic+art/](https://www.funnyjunk.com/funny_pictures/4285058/electronic+art/ "https://www.funnyjunk.com/funny_pictures/4285058/electronic+art/")

[https://obviousmag.org/en/archives/2010/07/electronic_art.html](https://obviousmag.org/en/archives/2010/07/electronic_art.html "https://obviousmag.org/en/archives/2010/07/electronic_art.html")

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