SoundDetectorWing

This repository contains KiCad 5 files for a FeatherWing board which lets you plug in a SparkFun Sound Detector and use it with a Feather. It runs the Sound Detector at 5V, and then has voltage dividers to convert the output signals to 3.3V, for use by the Feather.

The "audio" analog signal is connected to feather pin A0, the "envelope" analog signal is connected to feather pin A1, and the "gate" digital signal is connected to the feather pin that I call F0. There is also a potentiometer connected to feather pin A2, which can be used, for example, if you want to implement an adjustable threshold in software (rather than using the Sound Detector's "gate" signal).

The board has three M2.5 mounting holes which should line up with the Feather, and two M3 mounting holes which should line up with the Sound Detector. There are optional places for two SMT decoupling capacitors.

SparkFun recommends running the Sound Detector at 5V, rather than 3.3V, so the Sound Detector is powered from the Feather's VUSB pin, to get a solid 5V supply. A consequence of this is that this FeatherWing will not work on battery power; you must have USB plugged in for power.

• View schematic
• Order board on OSH Park (photo shows the OSH Park "after dark" option)

Bill of Materials

Ref	Description	MPN	Digi-Key PN
C1, C2	CAP CER 10UF 10V X5R 0805	C0805C106K8PACTU	399-4925-1-ND
J1	16-pin male header 2.54mm
J2	12-pin male header 2.54mm
J3	CONN HDR 5POS 0.1 GOLD PCB	PPPC051LFBN-RC	S7038-ND
R1, R3, R5	RES 1.74K OHM 1/4W 1% AXIAL	MFR-25FBF52-1K74	1.74KXBK-ND
R2, R4, R6	RES 3.3K OHM 1/4W 1% AXIAL	RNMF14FTC3K30	S3.3KCACT-ND
RV1	POT 10K OHM THUMBWHEEL CERM ST	3352T-1-103LF	3352T-103LF-ND