Follow the steps below to solder the hardware in the project. If you're new to soldering be sure to read the guide to excellent soldering.
Note the IR receiver is optional. If you choose not to use the IR receiver then ignore the instructions that deal with assembling and connecting it to the Gemma. Without the IR receiver you will only be able to program one animation to constantly run instead of being able to control animations with the remote control.
Cut your NeoPixel strip down to the size you'd like to use for your torch. For a 16oz mason jar a strip of 6 NeoPixels (from the 30 pixels per meter strip) works great, and for a 32oz mason jar 10 NeoPixels are best. Make sure to only cut the NeoPixel strip on the line with exposed solder pads between pixels.
Next solder the NeoPixel strip and IR receiver to the Gemma as shown in the Circuit Diagram section.
Once the parts are soldered together gently bend the IR receiver so it's facing behind the Gemma, and the NeoPixel strip so it forms a U shape as shown below.
Continue on to learn how to install the Arduino sketch that controls the hardware.