The diagram below provides a general visual reference for wiring of the components once you get to the Assembly page. This diagram was created using the software package Fritzing.

Adafruit Library for Fritzing

Adafruit uses the Adafruit's Fritzing parts library to create circuit diagrams for projects. You can download the library or just grab individual parts. Get the library and parts from GitHub - Adafruit Fritzing Parts.

Wired Connections

• The speaker wires are connected to pins on the screw block terminal. Red to SPK+, Black to SPK-
• The slide switch is connected to the EN and GND pins on the Feather.
• A 400mAh battery is connected to the battery port on the Feather.

Optional: Battery Monitor

With the addition of two 100KΩ resistors (and a small edit to the code, explained later), the D20 can sense and announce when the battery needs charging.

The two resistors are connected in series. One end goes to the board’s BAT pin, opposite end to a GND pin, and the center point to one of the analog input pins such as A3.

The Feather’s main GND pin might already be occupied by a wire for the power switch. If you can’t fit both the wire and resistor through that hole, other ground points will suffice, such as the one on the Servo header.