DFRobot Gravity H2 Gas Sensor Calibrated - I2C, UART & Analog Output

The sensor operates from 3.3V to 5.5V DC, making it directly compatible with both 3.3V logic systems (like ESP32 or Raspberry Pi) and standard 5V Arduino boards without requiring a logic level shifter. The low operating current (<5mA) also makes it suitable for battery-powered applications.

Use I2C for multi-sensor networks or when you need to read multiple data points (concentration, temperature) easily. Choose UART for simple serial communication over longer distances or when integrating with systems expecting a serial data stream. The analog voltage output (0-3V) is ideal for quick prototyping with an ADC or for systems without a digital communication bus.

Yes, the sensor is factory-calibrated for hydrogen and is ready to use out of the box. As an electrochemical sensor, its sensitivity will degrade over its typical 2-year lifespan. For critical safety applications, periodic validation against a known standard is recommended, though routine user recalibration is not typically required for general monitoring.

Yes, you can connect multiple sensors using the I2C interface. The module supports 32 software-configurable I2C addresses, allowing you to set a unique address for each sensor on the same I2C bus to avoid conflicts and create a multi-point monitoring network.