dfrobot Gravity: Analog Sound Level Meter

AI context

Dense context for pasting into a model prompt — addresses, pinout, voltages, tolerances and the vendor's reference circuit.

PART: DFRobot Gravity: Analog Sound Level Meter, SKU SEN0232 - a 60 x 43 mm analog sound-level module that outputs a DC voltage proportional to the A-weighted sound level. The vendor never names the microphone or the detector part, so part is null and there is no data sheet to link.
ADDRESSES: none. The output is a single analog voltage; there is no bus on this board.
PINOUT: three pads, numbered as the vendor's own pinout table numbers them: 1 A, the analog signal output (0.6-2.6 V); 2 +, power VCC 3.3-5.0 V; 3 -, power GND. All three are the Gravity PH2.0-3P connector.
SUPPLY: 3.3-5.0 V on pad 2, drawing 22 mA at 3.3 V and 14 mA at 5.0 V. Because the output is a fixed 0.6-2.6 V regardless of the supply, the ADC range needed is 2.6 V and above at either rail.
LOGIC: there is no digital interface and no logic-level dependency - the only host connection is an ADC input, and the vendor publishes no absolute maximum on the output pin, so do not park it on a rail higher than its supply.
CIRCUIT: the vendor publishes no schematic, so the module's own buffer, filter and decoupling values are not recorded. The reference circuit the vendor does give is the arithmetic: dB = 50 + 16.67 x Vout (approximately), which is the conversion between the 0.6-2.6 V output and decibels.
TRAPS: (1) The meter cannot read below 30 dBA and the vendor's own FAQ says a quiet room still reads above 30 dBA because the microphone hears what a human ear does not - a reading of 30 dBA is a floor, not a measurement. (2) The output is an instantaneous value over roughly hundreds of milliseconds, so consecutive reads flutter; average them in software. (3) Frequency response stops at 8.5 kHz and weighting is A-only, so it is not a substitute for a calibrated SLM. (4) Measurement error is quoted at plus or minus 1.5 dB.