DFRobot Gravity Phosphine PH3 Gas Sensor (Calibrated) - I2C & UART Output

This module is specifically factory-calibrated for Phosphine (PH3) gas detection. The sensor element is not user-interchangeable; it is a dedicated electrochemical cell optimized for PH3. Attempting to detect other gases listed in some descriptions (like CO or O2) would require a completely different, specifically calibrated probe.

The sensor uses standard I2C protocol. The default I2C address is provided in the datasheet/library. You can software-configure one of 32 unique addresses via a specific command sequence to avoid conflicts when using multiple sensors on the same I2C bus. Detailed instructions are included in DFRobot's sample code.

The UART (TTL) output provides serial data packets containing processed concentration values. The I2C interface offers digital communication with advanced features like temperature data and alarm thresholds. The analog output provides a voltage signal (typically 0-Vcc) proportional to gas concentration, suitable for simple ADC readings. The output mode is selected via a physical switch or software command.

The sensor is factory-calibrated for PH3 and is ready for use. However, periodic calibration checks are recommended for critical applications to ensure long-term accuracy. The electrochemical sensing element has a typical operational lifespan of two years under normal environmental conditions, after which sensitivity may degrade.

Yes. With an operating voltage range of 3.3V to 5.5V, it is directly compatible with both 5V systems (like Arduino Uno) and 3.3V logic devices (like Raspberry Pi, ESP32). The I2C and UART logic levels are tied to the supply voltage, ensuring safe communication.