Winsen ZE29A C2H5OH Alcohol Detection Module - UART Output

The module provides a digital UART interface with 3.3V TTL logic levels. Connect the TX and RX pins to a compatible UART port on your microcontroller (e.g., Arduino, ESP32, Raspberry Pi). Ensure your logic levels are compatible; a logic level converter may be needed if your MCU operates at 5V logic.

The built-in pressure sensor detects when a user is blowing into the device. This triggers the measurement cycle, ensuring the sampled air is from a direct exhale, which is critical for accurate breath alcohol concentration (BrAC) readings. It also provides a 'blow interruption' alarm if the airflow stops.

The module requires a stable 5V DC power supply (±0.3V tolerance). During operation, it draws less than 500 mA. It is important to use a well-regulated power source to ensure sensor stability and accuracy.

The module is calibrated at the factory. However, for applications requiring high legal traceability (like law enforcement breathalyzers), periodic recalibration against a known standard gas concentration is recommended to maintain long-term accuracy, as electrochemical sensors can drift over time.

The preheat time to reach operational readiness is ≤10 seconds from a cold start. Once preheated, the electrochemical sensor provides a continuous digital output via UART, with the data update rate and specific response time detailed in the manufacturer's datasheet.