Gravity Analog Sound Level Meter

This Gravity sound level meter from DFRobot measures the ambient sound level with a low-noise microphone and a measuring circuit. It outputs an analog voltage of 0.6 V to 2.6 V, which corresponds linearly to 30 dBA to 130 dBA: sound level in dBA = voltage in V × 50. The module is factory calibrated and runs on 3.3 V and 5 V.

Important: The black film on the microphone is sensitive and must not be touched with fingernails or sharp objects. Do not place the module on conductive surfaces, otherwise the microphone pins will be short-circuited; better place it on a dry, insulating surface or mount it with nylon spacers.

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces
• Gravity 16Bit 4-Channel ADC Analog Digital Converter I2C ADS1115
• M3x10mm Nylon Spacer Standoff Set 10 Pieces

Features:

• Measuring range 30 dBA to 130 dBA, measurement error ±1.5 dB
• A-weighting, frequency response 31.5 Hz to 8.5 kHz
• Time weighting 125 ms
• Linear analog output, factory calibrated
• Gravity 3-pin connector: A, +, -

Application Examples:

• Monitoring noise in living rooms and bedrooms
• Noise measurement on roads and outdoors
• Logging sound levels in IoT projects
• Indication when a sound level is exceeded

Documentation:

• Wiki DFRobot SEN0232
• Dimension drawing (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0232
• Input voltage: 3.3 V to 5.0 V
• Input current: 22 mA at 3.3 V, 14 mA at 5.0 V
• Output voltage: 0.6 V to 2.6 V
• Measuring range: 30 dBA to 130 dBA
• Conversion: dBA = output voltage in V × 50
• Measurement error: ±1.5 dB
• Frequency weighting: A
• Frequency response: 31.5 Hz to 8.5 kHz
• Time weighting: 125 ms
• Dimensions: 60 × 43 × 9 mm
• Weight: 24 g

Scope of Delivery:

• 1× Gravity sound level meter
• 1× Gravity analog cable 3-pin