Gravity: SGP40 Air Quality Sensor

The Gravity SGP40 Air Quality Sensor uses Sensirion's SGP40 digital VOC sensor chip with built-in temperature and humidity compensation. It outputs a VOC index (0–500) that can be used directly to evaluate indoor air quality without calibration. The Gravity interface provides plug-and-play connectivity to DFRobot controllers and other I2C-compatible boards.

With ultra-low power consumption and a fast 2-second response time, this sensor is well suited for long-running indoor installations such as air purifiers, kitchen hoods, and ventilation control systems. C and Python libraries are available.

Key Features

• SGP40 VOC Sensor – Sensirion CMOSens technology with micro-hotplate
• No Calibration Required – Built-in temperature and humidity compensation
• VOC Index Output – 0–500 scale for direct air quality indication
• Ultra-Low Power – 2.6 mA operating current
• Fast Response – 2-second response time, 10-second preheat
• Gravity Interface – I2C connection with standard Gravity cable

Ideal For

• Air purifiers and kitchen hoods
• Demand-controlled ventilation
• Thermostats and HVAC systems
• Indoor air quality monitoring

Specifications

• Power Supply – 3.3–5 V
• Operating Current – 2.6 mA
• Preheat Time – 10 s
• Response Time – 2 s
• Interface – I2C (address 0x59)
• VOC Index Range – 0–500
• Measuring Range – 0–1000 ppm (ethanol equivalent)
• Operating Temperature – -10°C to 50°C
• Operating Humidity – 0–90% RH
• Dimensions – 20 × 22 mm

Package Contents

• 1× Gravity SGP40 Air Quality Sensor
• 1× Gravity 4-Pin I2C/UART Sensor Cable