2022-04-11 19:31:02 +02:00
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# Arduino Spy Bug
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A simple voice recorder for Arduino using an SD card and an electret microphone amplifier circuit.
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2022-04-18 20:42:52 +02:00
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Independent of any third-party libraries.
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2022-04-11 19:31:02 +02:00
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## Wiring (also documented in spybug/spybug.ino)
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### SD Card Wiring
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SD | Nano
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---------|------------
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D0 (DO) | D12 (MISO)
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VSS | GND
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CLK | D13 (SCK)
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VDD | 5V or 3V3
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CMD (DI) | D11 (MOSI)
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D3 (CS) | D10 (SS)
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WARNING: SD cards are not designed for 5V; I have been using 5V anyways
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and everything seems fine, but beware that there is a significant risk
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of immediate or premature failure when not using a buffer circuit.
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SD pin D3 is the chip select pin. It can be set manually in `PIN_SS`.
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### Microphone Wiring (MAX9814 w/ electret microphone)
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Mic | Nano
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---------|------------
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VCC | 5V
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GND | GND
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Out | A0
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Out defaults to A0 (AdcChannel0), but can be set manually in `ADC_CHANNEL`.
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2022-04-18 23:47:15 +02:00
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## Power Consumption (Arduino Nano)
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Mode | Unmodified | No voltage regulator | No TTL module or voltage regulator
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----------|------------|----------------------|-----------------------------------
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Waiting | ~10mA | ~5.8mA | ~6μA
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2022-04-18 23:48:23 +02:00
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Recording | ~30mA | ~25.1mA | ~25mA
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