Winsen ZE03-H2S Hydrogen Sulfide Gas Sensor Module - UART & Analog Output

The module provides dual outputs: a digital UART serial interface operating at 3V TTL logic levels and an analog voltage output. The analog output provides a voltage signal proportional to the detected H₂S concentration, which can be read directly by a microcontroller's ADC pin.

The ZE03-H2S module operates from a DC power supply between 3.7V and 9V. Its typical working current is less than 5mA, making it suitable for low-power and battery-operated applications such as portable gas detectors.

Connect the module's TX and RX pins to your microcontroller's UART RX and TX pins respectively, ensuring a common ground. The module communicates via a standard serial protocol at a default baud rate (commonly 9600 bps). You can send specific command bytes to request concentration data or configure the module's settings.

The ZE03 is a general-purpose electrochemical module platform. While this specific variant is configured with an H₂S sensor element, the base ZE03 board can be paired with different Winsen electrochemical sensors to detect gases like Carbon Monoxide (CO), Sulfur Dioxide (SO₂), Ammonia (NH₃), or Oxygen (O₂).

Yes, like all electrochemical sensors, periodic calibration is recommended to maintain accuracy. The module facilitates calibration through its UART interface using specific command sets. It is advised to calibrate the sensor in a known zero-gas environment and with a standard concentration gas source, following the manufacturer's recommended procedures.