# Logan’s Run Hand Jewel LED
## Overview
https://www.youtube.com/watch?v=kN0PZbytzZM
## Glowing Element
In this guide, you'll learn how to build a bright glowing light that can be used for cosplay elements, decor and wearables. The circuit and components are fully contained in a 3D printed cylindrical enclosure. An integrated switch allows you to turn the circuit off without having to take it apart. The circuit is powered by an Adafruit GEMMA M0 or v2 and a small 150mAh lithium polymer battery. The NeoPixel Jewel contains 7 individual LEDs that can be programmed to display different colors and animations. With all of the components fitted inside the enclosure, this makes for a very tight package that can be used in all sorts of projects.
## Inspired by _Logan's Run_
This project was inspired by the "Life Clock" in 1976's epic Sci-Fi film, _Logan's Run_. In the story, each person is implanted at birth with a "life-clock" crystal in the palm of their hand that changes color as they get older and begins blinking as they approach their "Last Day". This DIY version is different than the original prop seen in the film, and not at all screen accurare, but it does resemble the iconic object.
## Project Ideas
I can see this being used in cosplay, imagine energy beams and fire balls. This could be used as a lighting element for photography. The NeoPixel Jewel can output some pretty bright light, so this can give a great source of illumination. The circuit and enclosure are moderately small so this allows you to put it in different things. It doesn't have to be stuck on your palm. Get creative and remix this project to make it your own.
Info:
## Prerequisite Guides
This guide assumes you have basic soldering skills and know how to upload code an arduino. For beginners hobbyists looking to get started with the basics, we recommend walking through the following tutorials and get familiar with the components.
- [Collin's Lab: Soldering](../../../collins-lab-soldering/video?view=all) – How To Solder
- [Gemma M0 guide](../../../../adafruit-gemma-m0/circuitpython-digital-in-out?view=all)
- [Classic Introducing GEMMA guide](../../../../introducing-gemma/introduction)[ ](../../../../introducing-gemma) – How To Setup GEMMA
- [Slide Switch JST Adapter](../../../../on-slash-off-switches) – How To DIY Switches
## Parts
You'll need the following parts to build this project.
- [Gemma M0](https://www.adafruit.com/product/3501) or [GEMMA v2 wearable microcontroller](http://www.adafruit.com/products/1222 "Link: http://www.adafruit.com/products/1222")
- [Adafruit 7-NeoPixel Jewel](https://www.adafruit.com/products/3047)
- [150mAh 3.7v Lithium Ion Polymer Battery](https://www.adafruit.com/products/1317)
- [JST-PH 2-pin SMT Right Angle Connector](https://www.adafruit.com/products/1769)
- [JST-PH Battery Extension Cable](https://www.adafruit.com/products/1131)
- [Slide Switch](https://www.adafruit.com/products/805)
## Tools & Supplies
You'll also need the following tools and supplies to complete this project.
- [Soldering Iron & Solder](../../../adafruit-guide-excellent-soldering)
- [Tweezers Rhino SW-11](https://www.adafruit.com/products/3096)
- [Wire Strippers](https://www.adafruit.com/products/527)
- [Diagonal Flush Snips](https://www.adafruit.com/product/152)
- [Helping Third Hands](https://www.adafruit.com/products/291)
- [Flat Pliers](https://www.adafruit.com/products/1368)
# Logan’s Run Hand Jewel LED
## 3D Printing
## Download and 3D Print
You can 3D print the parts using Translucent filament on almost any desktop 3D printer. The 3D printed parts can be downloaded with the link below. If you don’t have a 3D printer, the files are free to download so can send them to a 3D printing service.
The design is modeled in Autodesk Fusion 360 and designed to print in PLA filament. The parts were 3D printed using the BCN3D Sigma and Ultimaker 3.
[Download files from Thingiverse](http://www.thingiverse.com/thing:2224640)
[Download files from Youmagine](https://www.youmagine.com/designs/logan-s-run-hand-jewel-led)
[Edit Design](https://a360.co/3tAl4VK)
## Edit Design
You can easily update the size or add features by editing the Fusion360 designs. The sketches are all listed in the timeline, so it's easy to adjust the size to each component.
## Slice Settings
Depending on your 3D printer, you may need to adjust the slice settings. We tested the enclosure on a BCN3D Sigma. The parts are oriented to print "as is".
- Nozzle: 0.3mm
- Extrusion Multiplier: 1.0
- Extrusion Width: 0.32mm
- Layer Height: 0.2mm
- Nozzle Temperature: 225c
- Print Speed: 60mm/s
##
## Wall Strength
We'll want the walls of the ** ** parts to be really strong by making sure gaps between them are solid (no zig zags inside the gaps). We used a .4mm nozzle but had to adjust the nozzle diameter to **.3mm** with an extrusion width of **.32mm** to make sure no "zig zag" paths are inside the wall gaps. To enable parimeters between walls you'll need to set the overlap to **50%**.
Make sure to always preview tools paths by stepping through each layer/line before printing to ensure proper tool paths are generated.
## Glue Gem Top
The **jewel-top-thread.stl** is printed separately to avoid using supports on the threads. We can attach the **jewel-top-thread** part to the **jewel-top.stl** by ** ** using a couple drops of super glue.
Make sure to align the two parts so the edges are flush.
# Logan’s Run Hand Jewel LED
## Circuit Diagram
Info:
## Wired Connections
The circuit diagram above shows how the components will be wired together. This won't be 100% exact in the actual circuit but it's a very close approximation.
- GND on the Trinket to GND on the Jewel
- D1 on the Trinket to DIN on the Jewel
- Vout on the Trinket to PWR on the Jewel
## Battery Power
The circuit will be powered by a 3.7V 150mAh Lithium ion battery via JST connection. The battery plugs into the JST slide switch adapter.
# Logan’s Run Hand Jewel LED
## Assemble
## On/Off Switch
To start this project, we'll work on making the on/off switch first. Gather up the JST extension cable, JST right-angle female connector and the slide switch. We'll use this parts to build a on/off switch. This will allow us to easily cut the power from the circuit. Be sure to check out our [DIY On/Off JST Slide Adapter](../../../../on-slash-off-switches/overview) guide to get a full step-by-step tutorial. This guide summarizes it since it's only a portion of the build.
## Measure & Cut JST Extension Cable
Arrange the JST extension cable, slide switch and female JST connector on your work surface. We'll need to cut the JST extension cable so the wires are a certain length. Grab hold of the end with the male JST connector and measure the cable so it's 62mm in length. Then, cut the red and black wires. We'll only need the end with the male JST connector, so we can store the other end for another project. Next, separate the red and black wires from the JST cable by pulling them apart. Then, cut the red wire in half so we have a separate connection. Now we can layout our components like shown the photo. We'll need to connect the two red wires to the slide switch, and the black and red wires to the female JST connector.
###
## Prep Wires for Switch
We'll need to strip and tin the tips of each wire in order to more easily attach them to the other components. Use wire strippers to remove a bit of insulation from each wire. Then, tin the exposed strands of wire by applying a small amount of solder to them. This will also prevent the strands of wire from fraying. You'll need to do this for each wire (thats a total of four tips). I suggest using helping third hands to assist you while soldering. The helping third hands can keep wires sturdy while you tin the wires.
## Attach Wires to JST Connector
Now that we have our wires prepped, we can work on connecting wires to the female JST right-angle connector. Start by secureing the female JST connector to the helping third hands. Then, tin the two electrodes by applying a small bit of solder. Before you solder the wires to the slide switch, I suggest using some pieces of heat shrink tubing to insulate the exposed electrodes. Now we can solder the red wire (the one we cut from the male JST cable) to the positive electrode on the JST connector. Note: The positive electrode has a visible notch on the top surface of the female JST connector. Then, solder the black (negative/ground) wire from the male JST cable to the negative (ground) electrode on the female JST connector.
## Prep Slide Switch
We'll need to prep the slide switch so that we can attach wires to the terminals. Start by removing one of the terminals from the switch using wire cutters – Either the far left or right, but NOT the middle! Then, trim the remaining two terminals short. Now we can tin them by applying a small amount of solder to them. This will make it easier to attach wires to the electrodes.
###
## Connect Wires to Slide Switch
With our slide switch prepped, we can now connect wires to the electrodes on the slide switch. We'll need to solder the positive connections from the male and female JST connectors to the two electrodes on the slide switch – These red wires are the positive(red) wires from the male & female JST connectors. Connect them to the slide switch by soldering the tips of the wires to the electrodes.
## Slide Switch JST Adapter
And now we have a slide switch JST adapter that we can use to power on/off our circuit. We'll connect our battery to the female JST connector. The male JST connector from the slide switch will connect to the female JST connector on-board the Adafruit GEMMA. For now, we can set it a side and work on connecting the NeoPixel Jewel to the Adafruit GEMMA.
## Prep Wires for NeoPixel Jewel
Now we can work on connecting the NeoPixel Jewel to the Adafruit GEMMA. We'll need three pieces of wire to connect these two components together. First, we'll need to measure out how long the three wires need to be – We found **24mm long** wires to be suffice for this project. Use wire cutters to cut three pieces of wire, 24mm in length. We used[25AWG silicone coated wires](https://www.adafruit.com/categories/472) because they're great for flexible connections. You can use different colored wires to help tell the connections apart, but it's not a requirement. Then, use wire strippers to remove a bit of insulation from the tips of each wire. After that, we can tin them by add a small amount of solder to the tips of each wire.
## Connect NeoPixel Jewel to GEMMA
### Insert Wires Into GPIO
Secure the two components to third helping hands with the back of the PCB facing up and bring the two arms close to each other like shown in the photo. This will make it easy to solder wires to each board. Insert the tips of each wire into the corresponding pins. This will make it easier to solder the wire in place.
- **GND** from NeoPixel to **GND** on GEMMA
- **Data In** from NeoPixel to **D1** on GEMMA
- **5V** from NeoPixel to **VOUT** on GEMMA
### Solder Wires to Gemma and Jewel
Apply a small amount of solder to each pad on the Gemma. Try not to apply too much solder the large pads on the Gemma. Tin the pads on the NeoPixel Jewel and then solder the wires for power, data and ground. And now we have the NeoPixel Jewel connected to the Adafruit GEMMA, yay!
## Circuit Sandwich
Fold the NeoPixel Jewel over the Gemma so the flat sides of the boards are back to back. The LEDs should be facing outward like in the picture. If the wires are too long or stick out, we will need to shorten the wires to make it compacted inside the enclosure. Now we should be able to lightly compress the two boards together. Make sure the wires are small enough to stay hidden between the two boards.
## Install Slide Switch
Next, we'll work on fitting the slide switch into the 3D printed enclosure. Grab the two parts and start working the slide switch into the enclosure. The body of the slide switch will be housed into three walls located inside the enclosure. Press the body down in between the walls until its flush with the surface. The actuator from the slide will protrode from the side of the enclosure.
##
## Install Battery
Now we can connect the battery to the slide switch. Connect the male JST connector from the battery to the female JST connector thats attached to the slide switch. Next, carefully place the battery into the enclosure. You'll need to fit the cable from the battery into the enclosure, so we need to arrange the wiring so it's neatly packaged into the case. We found it best if you coil the wiring and tuck it inbetween the walls of the enclosure so it stays in place. The male JST connector from the slide switch should be accessible. Next, we'll connect the Adafruit GEMMA to the slide switch.
## Connect Slide to Gemma
Now we can connect the male JST connector attached to the switch to the female JST connector on-board the Adaruit GEMMA by plugging the male JST connector to the female JST connector. Make sure the switch on-board the Adafruit GEMMA is set to the ON position. Next, we'll work on install the NeoPixel Jewel and GEMMA assembly into the 3D printed enclosure.
## Install NeoPixel and GEMMA
Now we'll need to insert the NeoPixel and GEMMA into the 3D printed case. Lay the assembly on top of the battery with the NeoPixel LEDs facing up. You'll need keep all of the wiring contained within the enclosure. You may need to press the component together and hold them in place to install the cover. Next, we'll screw the top cover onto the enclosure.
## Twist top
Grab the 3D printed top piece and place it over the enclosure. The cover and enclosure feature a custom thread that coils around edges of the parts. With the cover ontop of the case, slowly press them together and turn the cover clockwise until the threading meet and start screwing together. Keep turning until the two pieces are fully secured together. And thats it! Now we have our self-contained assembly, ready to wear, place or install onto our project. Sweeet!
## Usage
### Attaching to Human Skin
We used3M Nextcare Transpore Flexible Clear Tape (a medical grade tape) to attach the enclosure to the palm of our hands. **Tegaderm Tape** is similar and specifically designed to adhere to human skin.
If you plan to attach the enclosure to another surface, you'll need to pick the right adhesive for the job – This depends on the materials. Cyanoacrylates (super glue) or E6000 work well for most applications. Just make sure you still have access to the power switch when securing the enclosure to another surface.
# Logan’s Run Hand Jewel LED
## Arduino Code
Info:
## Getting Code Onto GEMMA
In this portion of the guide, we'll get code uploaded to the **Adafruit GEMMA** micro-controller. If you don't write / understand code, don't to worry! You don't need to be a programmer to be able to upload prewritten code :-)
We'll walk you through the whole process.
First, visit the Adafruit GEMMA tutorial page by clicking the button below. Follow the instructions to download & setup the Arduino IDE and install drivers.
[Getting Started with GEMMA](https://learn.adafruit.com/introducing-gemma)
## Install Adafruit NeoPixel Library
Next, we need to add support for NeoPixels.
Visit the Adafruit NeoPixel tutorial to install the NeoPixel library!
[Install NeoPixel Library](https://learn.adafruit.com/adafruit-neopixel-uberguide/arduino-library-installation)
## Uploading Code to Board
Now that we have the Adafruit boards & NeoPixel library installed, we can get our code ready to upload onto the board. Select all of the code listed below in the black box and copy it to your clip board. Then, in Arduino IDE, paste it in the sketch window (making sure to overwrite anything currently there). Next, goto the **Tools** menu \> **Board** and select **Adafruit GEMMA 8MHz**. Now you can click on the " **check mark**" icon to verify the code. If it's all good, we can continue to upload the code to the board.
## Connect USB Data Cable to GEMMA
Be sure to use a micro USB cable that can transfer data - A USB cable that ONLY charges devices will simply not work. Plug it into the microUSB port on the Adafruit GEMMA board and the USB port on your computer (try to avoid connecting to a USB hub). As soon as you plug it in, you'll see a red LED blink on the Adaruit GEMMA - This let's you know the board is ready to except code. While the LED is blinking, click on the Upload button (It's a right arrow icon, next to the chekc mark). The Arduino IDE will notify you if the upload is successful and completed.
https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/Logans_Run_Hand_Jewel_LED/Logans_Run_Hand_Jewel_LED.ino
# Logan’s Run Hand Jewel LED
## CircuitPython Code
**GEMMA M0** boards can run **CircuitPython** — a different approach to programming compared to Arduino sketches. In fact, **CircuitPython comes factory pre-loaded on GEMMA M0**. If you’ve overwritten it with an Arduino sketch, or just want to learn the basics of setting up and using CircuitPython, this is explained in the [**Adafruit GEMMA M0 guide**](../../../../adafruit-gemma-m0/circuitpython-setup-1).
Info:
Below is CircuitPython code that works similarly (though not exactly the same) as the Arduino sketch shown on a prior page. To use this, plug the GEMMA M0 into USB…it should show up on your computer as a small **flash drive** …then edit the file “ **code.py** ” with your text editor of choice. Select and copy the code below and paste it into that file, **entirely replacing its contents** (don’t mix it in with lingering bits of old code). When you save the file, the code should **start running almost immediately** (if not, see notes at the bottom of this page).
**If GEMMA M0 doesn’t show up as a drive, follow the GEMMA M0 guide link above to prepare the board for CircuitPython.**
https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/Logans_Run_Hand_Jewel_LED/code.py
This code requires the **neopixel.py** library. A factory-fresh board will have this already installed. If you’ve just reloaded the board with CircuitPython, create the “lib” directory and then [download neopixel.py from Github](https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel).
[Download neopixel.py from GitHub](https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel)
## Featured Products
### Adafruit GEMMA M0 - Miniature wearable electronic platform
[Adafruit GEMMA M0 - Miniature wearable electronic platform](https://www.adafruit.com/product/3501)
The **Adafruit Gemma M0** is a super small microcontroller board, with just enough built-in to create many simple projects. It may look small and cute: round, about the size of a quarter, with friendly alligator-clip sew pads. But do not be fooled! The Gemma M0 is incredibly...
In Stock
[Buy Now](https://www.adafruit.com/product/3501)
[Related Guides to the Product](https://learn.adafruit.com/products/3501/guides)
### Adafruit GEMMA v2 - Miniature wearable electronic platform
[Adafruit GEMMA v2 - Miniature wearable electronic platform](https://www.adafruit.com/product/1222)
**Deprecation Warning: The Gemma bit-bang USB technique it uses doesn't work as well as it did in 2014, many modern computers won't work well. So while we still carry the Gemma so that people can maintain some older projects, we no longer recommend it.**
In Stock
[Buy Now](https://www.adafruit.com/product/1222)
[Related Guides to the Product](https://learn.adafruit.com/products/1222/guides)
### NeoPixel Jewels
[NeoPixel Jewels](https://www.adafruit.com/product/3047)
Be the belle of the ball with the NeoPixel Jewel! We fit seven of our tiny 5050 (5mm x 5mm) smart RGB or RGBW LEDs onto a beautiful, round PCB with mounting holes and a chainable design to create what we think is our most elegant (and evening-wear appropriate) NeoPixel board...
Out of Stock
[Buy Now](https://www.adafruit.com/product/3047)
[Related Guides to the Product](https://learn.adafruit.com/products/3047/guides)
### Lithium Ion Polymer Battery - 3.7v 150mAh
[Lithium Ion Polymer Battery - 3.7v 150mAh](https://www.adafruit.com/product/1317)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 150mAh for a total of about 0.6 Wh. If you need a larger battery,
Out of Stock
[Buy Now](https://www.adafruit.com/product/1317)
[Related Guides to the Product](https://learn.adafruit.com/products/1317/guides)
### Breadboard-friendly SPDT Slide Switch
[Breadboard-friendly SPDT Slide Switch](https://www.adafruit.com/product/805)
These nice switches are perfect for use with breadboard and perfboard projects. They have 0.1" spacing and snap in nicely into a solderless breadboard. They're easy to switch no matter what size fingers you have, but not so easy that they'll get flipped by accident. Work great as...
In Stock
[Buy Now](https://www.adafruit.com/product/805)
[Related Guides to the Product](https://learn.adafruit.com/products/805/guides)
### JST-PH 2-Pin SMT Right Angle Connector
[JST-PH 2-Pin SMT Right Angle Connector](https://www.adafruit.com/product/1769)
A simple 2-pin connector that is compatible with the "JST PH 2-pin" connector - perfect for soldering to the bottom of our [3.3V Logic Trinket](//www.adafruit.com/products/1500) and [5V Logic Trinket](//www.adafruit.com/products/1501)! These mate perfectly with...
In Stock
[Buy Now](https://www.adafruit.com/product/1769)
[Related Guides to the Product](https://learn.adafruit.com/products/1769/guides)
### JST-PH Battery Extension Cable - 500mm
[JST-PH Battery Extension Cable - 500mm](https://www.adafruit.com/product/1131)
By popular demand, we now have a handy extension cord for all of our JST PH-terminated battery packs (such as our LiIon/LiPoly and 3xAAA holders). One end has a JST-PH compatible socket, and the other end has a matching plug. Between the two, 500mm of color coded wire. Handy for wearable...
In Stock
[Buy Now](https://www.adafruit.com/product/1131)
[Related Guides to the Product](https://learn.adafruit.com/products/1131/guides)
### Silicone Cover Stranded-Core Wire - 26AWG in Various Colors
[Silicone Cover Stranded-Core Wire - 26AWG in Various Colors](https://www.adafruit.com/product/1970)
Silicone-sheathing wire is super-flexible and soft, and it's also strong! Able to handle up to 200°C and up to 600V, it will do when PVC covered wire wimps out. We like this wire for being extremely supple and flexible, so it is great for wearables or projects where the wire-harness...
Out of Stock
[Buy Now](https://www.adafruit.com/product/1970)
[Related Guides to the Product](https://learn.adafruit.com/products/1970/guides)
## Related Guides
- [Gemma 3D Printed Tree Topper](https://learn.adafruit.com/gemma-3d-printed-tree-topper.md)
- [FLORA & Codebender](https://learn.adafruit.com/flora-and-codebender.md)
- [NeoPixel Punk Collar](https://learn.adafruit.com/neopixel-punk-collar.md)
- [CircuitPython Hardware: PCA9685 DC Motor & Stepper Driver](https://learn.adafruit.com/micropython-hardware-pca9685-dc-motor-and-stepper-driver.md)
- [CircuitPython Hardware: LED Backpacks & FeatherWings](https://learn.adafruit.com/micropython-hardware-led-backpacks-and-featherwings.md)
- [Chirping Plush Owl Toy](https://learn.adafruit.com/chirping-plush-owl-toy.md)
- [Kaleidoscope Eyes (Trinket-Powered NeoPixel LED Ring Goggles)](https://learn.adafruit.com/kaleidoscope-eyes-neopixel-led-goggles-trinket-gemma.md)
- [Twinkly Earwarmer Headband](https://learn.adafruit.com/twinkly-ear-warmer.md)
- [Unibeam](https://learn.adafruit.com/unibeam.md)
- [Larson Scanner Shades (Trinket-Powered NeoPixel LED Strip Glasses)](https://learn.adafruit.com/larson-scanner-shades.md)
- [Adafruit Gemma M0](https://learn.adafruit.com/adafruit-gemma-m0.md)
- [Glowing Scale Armor](https://learn.adafruit.com/glowing-scale-armor.md)
- [3D Printed NeoPixel Ring Hair Dress](https://learn.adafruit.com/neopixel-ring-hair-dress.md)
- [Trinket / Gemma IR Control](https://learn.adafruit.com/trinket-gemma-ir-remote-control.md)
- [3D Printed LED Fire Horns](https://learn.adafruit.com/3d-printed-led-fire-horns.md)