A simple voice recorder for Arduino using an SD card and an electret microphone amplifier circuit.
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README.md

Arduino Spy Bug

A simple voice recorder for Arduino using an SD card and an electret microphone amplifier circuit.

Independent of any third-party libraries.

Wiring (also documented in spybug/spybug.ino)

SD Card Wiring

SD Nano
D0 (DO) D12 (MISO)
VSS GND
CLK D13 (SCK)
VDD 5V or 3V3
CMD (DI) D11 (MOSI)
D3 (CS) D10 (SS)

WARNING: SD cards are not designed for 5V; I have been using 5V anyways and everything seems fine, but beware that there is a significant risk of immediate or premature failure when not using a buffer circuit.

SD pin D3 is the chip select pin. It can be set manually in PIN_SS.

Microphone Wiring (MAX9814 w/ electret microphone)

Mic Nano
VCC 5V
GND GND
Out A0

Out defaults to A0 (AdcChannel0), but can be set manually in ADC_CHANNEL.

Power Consumption (Arduino Nano)

Mode Unmodified No voltage regulator No TTL module or voltage regulator
Waiting ~10mA ~5.8mA ~6μA
Recording ~30mA ~25.1mA ~25mA