Circuit Diagram

This provides a visual reference for wiring of the components. They aren't true to scale, just meant to be used as reference. This diagrams was created using the Fritzing software package.

Wired Connections

The NeoPixel strip is wired to the nRF52840 Feather using 3-pin JST connectors. A slide switch is wired to the enable and ground.

Powering

The Adafruit nRF52840 Feather can be powered via USB or JST using a 3.7v LiPo battery. In this project, a 500mAh LiPo battery is used. The battery is rechargeable via the USB port on the Adafruit Feather. The slide switch is wired to the enable and ground pins on the Adafruit nRF52840 Feather – This switches the 3V regulator on and off. The battery can still recharge while the 3V regulator is switched off.

NeoPixel Strip Wiring

• DATA IN from NeoPixel to Pin #6 on nRF52840 Feather
• GND from NeoPixel to GND on nRF52840 Feather
• +5V PWR from NeoPixel to 3V on nRF52840 Feather

Be sure you use the end that says Din and not Dout.