DFRobot Gravity HF Sensor Calibrated - Hydrogen Fluoride Gas Sensor Module w/ I2C, UART & Analog Output

The sensor is designed for seamless compatibility with any 3.3V or 5V logic microcontroller, including Arduino (Uno, Mega), ESP32, ESP8266, Raspberry Pi (using logic level conversion), and STM32 boards. Its Gravity interface and provided sample code simplify connection and data reading via I2C, UART, or analog pins.

The sensor's I2C address can be modified programmatically using dedicated commands sent over the I2C or UART interface. This feature is essential for creating multi-sensor networks on a single I2C bus, allowing you to monitor HF concentration at multiple points or combine it with other DFRobot Gravity gas sensors without address conflicts.

No, the electrochemical sensing element is factory calibrated for hydrogen fluoride detection. The module includes integrated temperature compensation to maintain accuracy across its operating range. For critical applications, periodic verification against a known standard is recommended, as all electrochemical sensors have a finite lifespan (typically >2 years).

The analog output provides a voltage signal typically ranging from 0V to approximately 3V, linearly corresponding to the HF concentration from 0 to 10 ppm. This output can be directly connected to an MCU's ADC pin for simple threshold monitoring. For precise concentration values, using the digital I2C or UART interface is recommended.