# NeoPixel LED Heart Necklace
## Overview
https://youtu.be/PKWkEB1s5Ik
## NeoPixel Heart
In this project we’re building an LED heart with NeoPixels. This uses Black LED acrylic to diffuse the NeoPixels inside a 3D printed case. The heart is made from pieces of strips that are daisy chained to create a custom matrix.
## 3D Printed Case
The ItsyBitsy nRF52840 and 500mah lipo battery are housed in a separate 3D printed case. With a lipo backpack, you can recharge the battery over USB. We think this case will work nicely for your next wearable project. A button lets you trigger a reset, so you can easily update the firmware.
## BLE with ItsyBitsy
You can change the colors of the LEDs using the Adafruit BLE Connect app for iOS or Android. You can also trigger LED animations like the classic Paint your Dragon rainbow swirl. With the ItsyBitsy nRF52840, you can easily add BLE to your wearable projects.
## Parts List
List of parts used to build this project.
- [Adafruit ItsyBitsy nRF52840](https://www.adafruit.com/product/4481)
- [Mini Skinny NeoPixel Strip](https://www.adafruit.com/product/2970)
- [Trinket/ItsyBitsy Lipo Backpack](https://www.adafruit.com/product/2124)
- [500mAh battery](https://www.adafruit.com/product/1578)
- [Slide Switch](https://www.adafruit.com/product/805)
- [10-wire ribbon cable](https://www.adafruit.com/product/3890)
- [Fully reversible USB cable](https://www.adafruit.com/product/4111)
- [Black LED Acrylic](https://www.adafruit.com/product/4594)
### Black LED Diffusion Acrylic Panel 12" x 12" - 0.1" / 2.6mm thick
[Black LED Diffusion Acrylic Panel 12" x 12" - 0.1" / 2.6mm thick](https://www.adafruit.com/product/4594)
A nice whoppin' slab of some lovely black acrylic to add some extra diffusion to your LED Matrix project. This material is 2.6mm (0.1") thick and is made of special cast acrylic that makes it perfect for glowy projects, especially matricies or NeoPixels.
Unlike smoke or...
In Stock
[Buy Now](https://www.adafruit.com/product/4594)
[Related Guides to the Product](https://learn.adafruit.com/products/4594/guides)
### Adafruit ItsyBitsy nRF52840 Express - Bluetooth® LE
[Adafruit ItsyBitsy nRF52840 Express - Bluetooth® LE](https://www.adafruit.com/product/4481)
What's smaller than a Feather but larger than a Trinket? It's an **Adafruit ItsyBitsy nRF52840 Express** featuring the **Nordic nRF52840 Bluetooth® LE** processor! Teensy & powerful, with an fast nRF52840 Cortex M4 processor running at 64 MHz and 1 MB...
Out of Stock
[Buy Now](https://www.adafruit.com/product/4481)
[Related Guides to the Product](https://learn.adafruit.com/products/4481/guides)
### Adafruit Mini Skinny NeoPixel Digital RGB LED Strip - 144 LED/m
[Adafruit Mini Skinny NeoPixel Digital RGB LED Strip - 144 LED/m](https://www.adafruit.com/product/2970)
So thin. So mini. So teeeeeeny-tiny. It's the 'skinny' version of our classic NeoPixel strips!
These NeoPixel strips have 144 digitally-addressable pixel Mini LEDs per meter and are very affordable and are only 7.5 mm wide (0.3") if you remove the strip from the...
In Stock
[Buy Now](https://www.adafruit.com/product/2970)
[Related Guides to the Product](https://learn.adafruit.com/products/2970/guides)
### Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy
[Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy](https://www.adafruit.com/product/2124)
If you have an ItsyBitsy or Pro Trinket you probably know it's the perfect little size for a portable project. This LiPoly backpack makes it really easy to do! Instead of wiring 2 or 3 boards together to make a charging system, this little PCB sits on top of the PCB and allows a...
In Stock
[Buy Now](https://www.adafruit.com/product/2124)
[Related Guides to the Product](https://learn.adafruit.com/products/2124/guides)
### Lithium Ion Polymer Battery - 3.7v 500mAh
[Lithium Ion Polymer Battery - 3.7v 500mAh](https://www.adafruit.com/product/1578)
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 500mAh for a total of about 1.9 Wh. If you need a larger (or smaller!) battery,
Out of Stock
[Buy Now](https://www.adafruit.com/product/1578)
[Related Guides to the Product](https://learn.adafruit.com/products/1578/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)
### Fully Reversible Pink/Purple USB A to micro B Cable - 1m long
[Fully Reversible Pink/Purple USB A to micro B Cable - 1m long](https://www.adafruit.com/product/4111)
This cable is not only super-fashionable, with a woven pink and purple Blinka-like pattern, it's also fully reversible! That's right, you will save _seconds_ a day by not having to flip the cable around.
First let's talk about the cover and over-molding. We got these...
In Stock
[Buy Now](https://www.adafruit.com/product/4111)
[Related Guides to the Product](https://learn.adafruit.com/products/4111/guides)
### Part: Black LED Acrylic
quantity: 1
100mm x 100mm - 1/8in thickness
[Black LED Acrylic](https://www.adafruit.com/product/4594)
### Part: 1/8in Flat End Mill
quantity: 1
Single Flute Upcut
[1/8in Flat End Mill](https://www.inventables.com/technologies/solid-carbide-single-flute-upcut-end-mill)
### Part: Bantam Tools CNC
quantity: 1
Desktop CNC Milling Machine
[Bantam Tools CNC](https://www.bantamtools.com/)
## Inspirational Source:
This project was inspired by [Charlyn Gonda](https://twitter.com/chardane)'s Ring project. Check it out on her website:
[https://charlyn.codes/magic-acrylic-stays-opaque-until-light-shines-through/](https://charlyn.codes/magic-acrylic-stays-opaque-until-light-shines-through/)
- [Next Page](https://learn.adafruit.com/neopixel-led-heart-necklace/3d-printing.md)
## Featured Products
### Adafruit ItsyBitsy nRF52840 Express - Bluetooth® LE
[Adafruit ItsyBitsy nRF52840 Express - Bluetooth® LE](https://www.adafruit.com/product/4481)
What's smaller than a Feather but larger than a Trinket? It's an **Adafruit ItsyBitsy nRF52840 Express** featuring the **Nordic nRF52840 Bluetooth® LE** processor! Teensy & powerful, with an fast nRF52840 Cortex M4 processor running at 64 MHz and 1 MB...
Out of Stock
[Buy Now](https://www.adafruit.com/product/4481)
[Related Guides to the Product](https://learn.adafruit.com/products/4481/guides)
### Black LED Diffusion Acrylic Panel 12" x 12" - 0.1" / 2.6mm thick
[Black LED Diffusion Acrylic Panel 12" x 12" - 0.1" / 2.6mm thick](https://www.adafruit.com/product/4594)
A nice whoppin' slab of some lovely black acrylic to add some extra diffusion to your LED Matrix project. This material is 2.6mm (0.1") thick and is made of special cast acrylic that makes it perfect for glowy projects, especially matricies or NeoPixels.
Unlike smoke or...
In Stock
[Buy Now](https://www.adafruit.com/product/4594)
[Related Guides to the Product](https://learn.adafruit.com/products/4594/guides)
### Adafruit Mini Skinny NeoPixel Digital RGB LED Strip - 144 LED/m
[Adafruit Mini Skinny NeoPixel Digital RGB LED Strip - 144 LED/m](https://www.adafruit.com/product/2970)
So thin. So mini. So teeeeeeny-tiny. It's the 'skinny' version of our classic NeoPixel strips!
These NeoPixel strips have 144 digitally-addressable pixel Mini LEDs per meter and are very affordable and are only 7.5 mm wide (0.3") if you remove the strip from the...
In Stock
[Buy Now](https://www.adafruit.com/product/2970)
[Related Guides to the Product](https://learn.adafruit.com/products/2970/guides)
### Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy
[Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy](https://www.adafruit.com/product/2124)
If you have an ItsyBitsy or Pro Trinket you probably know it's the perfect little size for a portable project. This LiPoly backpack makes it really easy to do! Instead of wiring 2 or 3 boards together to make a charging system, this little PCB sits on top of the PCB and allows a...
In Stock
[Buy Now](https://www.adafruit.com/product/2124)
[Related Guides to the Product](https://learn.adafruit.com/products/2124/guides)
### Lithium Ion Polymer Battery - 3.7v 500mAh
[Lithium Ion Polymer Battery - 3.7v 500mAh](https://www.adafruit.com/product/1578)
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 500mAh for a total of about 1.9 Wh. If you need a larger (or smaller!) battery,
Out of Stock
[Buy Now](https://www.adafruit.com/product/1578)
[Related Guides to the Product](https://learn.adafruit.com/products/1578/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)
### Silicone Cover Stranded-Core Ribbon Cable - 10 Wire 1 Meter Long
[Silicone Cover Stranded-Core Ribbon Cable - 10 Wire 1 Meter Long](https://www.adafruit.com/product/3890)
For those who are fans of our silicone-covered wires, but are always looking to _up their wiring game_. We now have **Silicone Cover Ribbon cables!** These may look _a lot_ like
In Stock
[Buy Now](https://www.adafruit.com/product/3890)
[Related Guides to the Product](https://learn.adafruit.com/products/3890/guides)
### Fully Reversible Pink/Purple USB A to micro B Cable - 1m long
[Fully Reversible Pink/Purple USB A to micro B Cable - 1m long](https://www.adafruit.com/product/4111)
This cable is not only super-fashionable, with a woven pink and purple Blinka-like pattern, it's also fully reversible! That's right, you will save _seconds_ a day by not having to flip the cable around.
First let's talk about the cover and over-molding. We got these...
In Stock
[Buy Now](https://www.adafruit.com/product/4111)
[Related Guides to the Product](https://learn.adafruit.com/products/4111/guides)
## Related Guides
- [Adafruit ItsyBitsy nRF52840 Express](https://learn.adafruit.com/adafruit-itsybitsy-nrf52840-express.md)
- [Animated Flame Pendant](https://learn.adafruit.com/animated-flame-pendant.md)
- [CircuitPython Animated Sprite Pendants](https://learn.adafruit.com/circuitpython-sprite-animation-pendant-mario-clouds-flying-toasters.md)
- [Introducing ItsyBitsy 32u4](https://learn.adafruit.com/introducting-itsy-bitsy-32u4.md)
- [DotStar Fortune Necklace with Bluetooth and Touch](https://learn.adafruit.com/dotstar-fortune-necklace.md)
- [Cup o' Sound](https://learn.adafruit.com/cup-o-sound.md)
- [Happy Chewbacca Mask](https://learn.adafruit.com/happy-chewbacca-mask.md)
- [DRAFT PUNK](https://learn.adafruit.com/draft-punk.md)
- [CircuitPython BLE Advertising Beacons](https://learn.adafruit.com/circuitpython-ble-advertising-beacons.md)
- [ESP32 PlayStation Controller](https://learn.adafruit.com/esp32-playstation-controller.md)
- [Camera LED Ring Light](https://learn.adafruit.com/camera-ring-led-light.md)
- [MASLOW: an Open WiFi Detector with Adafruit Pro Trinket and CC3000](https://learn.adafruit.com/wifi-hotspot-finder-adafruit-pro-trinket-cc3000.md)
- [BLE Sniffer with nRF52840](https://learn.adafruit.com/ble-sniffer-with-nrf52840.md)
- [Color Balancing Video Camera Light feat. DotStars](https://learn.adafruit.com/color-balancing-light-box-with-dotstar-cool-warm-white-leds.md)
- [Getting Started with CircuitPython and Bluetooth Low Energy](https://learn.adafruit.com/circuitpython-nrf52840.md)
- [NeoPixel Infinity Mirror Coaster](https://learn.adafruit.com/infinity-mirror-coaster.md)