Page 156 - Programming the Photon Getting Started With the Internet of Things

Figure 7.9 Grove modules connected to the Photon shield.

Adafruit Particle NeoPixel Ring Kit

Add some dazzle to your Photon with this custom-made NeoPixel ring kit! Twenty-four
ultra-bright smart LED NeoPixels are arranged in a circle with 2.6-inch outer diameter, as
shown in Figure 7.10.

Figure 7.10 Adafruit NeoPixel Photon ring.

Snap in your Photon and upload the NeoPixel library code to light up the LEDs—
make an Internet of Blinky! Each LED is addressable, as the driver chip is inside the LED.

Each one has ~18-mA constant current drive so the color will be consistent even if the
voltage varies, and no external choke resistors are required, making the design slim.
Power the whole thing with a 3.5- to 5.5-V DC battery pack and you’re ready to rock.

To make your project portable, there is a Japan Solderless Terminal (JST) connector
for attaching an external battery. Power with 3.5- to 5.5-V DC—a rechargeable LiPo

battery works great, or a 3 × AAA or 3 × AA battery pack. The JST included enables you