The ZE08-CH2O Formaldehyde Sensor Module is a high-quality electrochemical sensor designed to detect formaldehyde (CH2O), volatile organic compounds (VOCs), alcohol, carbon monoxide, and other gases in the air. It features high sensitivity, low power consumption, and is suitable for a wide range of applications, including air quality monitoring, smart home equipment, air purifiers, and ventilation systems.

Features:

• High Sensitivity: Offers accurate detection of formaldehyde and VOC gases.
• Low Power Consumption: Designed for energy-efficient operation.
• High Stability: Strong anti-interference ability with temperature compensation.
• Multiple Output Methods: Provides UART, analog voltage signal, and PWM waveform outputs.
• Temperature Compensation: Built-in temperature sensor for consistent performance across varying conditions.
• Fast Response and Recovery Time: Quick detection and reset times.
• Miniaturized Design: Compact size suitable for portable and integrated systems.

Specifications:

• Gas Detection: Formaldehyde (CH2O), VOCs, alcohol, carbon monoxide, and other gases
• Output Data:
  • DAC Output: 0.4V ~ 2V (Standard voltage signal)
  • UART Output: 3V level
  • PWM Output: Provides waveform signal
• Working Voltage: 3.7V ~ 9V (with voltage reverse connection protection)
• Preheating Time: ≤ 3 minutes
• Response Time: ≤ 60 seconds
• Recovery Time: ≤ 60 seconds
• Detection Range: 0 ~ 5 PPM (Parts per Million)
• Resolution: 0.01 PPM or less
• Operating Temperature: 0 ~ 50°C
• Operating Humidity: 15% RH to 90% RH (non-condensing)
• Storage Temperature: 0 ~ 50°C

Applications:

• Air Quality Monitoring: Used in air purifiers, air conditioning systems, and fresh air ventilation.
• Smart Home Systems: For air quality detection in intelligent home automation.
• Portable Instruments: Suitable for hand-held air quality analyzers.
• Industrial Monitoring: Used in environments requiring detection of VOCs or hazardous gases.
• Environmental Health and Safety: Used in offices, homes, and public spaces for formaldehyde and VOC detection.

Package Includes:

• 1 x ZE08-CH2O Formaldehyde Sensor Module

The ZE08-CH2O is a VOC gas sensor that is capable of detecting formaldehyde (CH2O) concentration in the air. This module outputs analog signals corresponding to the detected gas levels, which can be interfaced with an Arduino for monitoring purposes. The sensor operates on 5V and communicates using both analog and digital outputs.

Components Required:

• Arduino Uno or any compatible Arduino board
• ZE08-CH2O VOC Gas Formaldehyde Sensor Module
• Jumper wires
• Breadboard (optional)

Pinout of the ZE08-CH2O Sensor:

• VCC: 5V power supply
• GND: Ground
• DO: Digital output (indicates threshold detection)
• AO: Analog output (corresponding to gas concentration)
• Heater: Control pin for the sensor's heater (typically left unconnected in basic usage)

Wiring the ZE08-CH2O Sensor with Arduino:

1. VCC from the ZE08-CH2O sensor connects to 5V on the Arduino.
2. GND from the ZE08-CH2O sensor connects to GND on the Arduino.
3. AO from the ZE08-CH2O sensor connects to A0 (analog input) on the Arduino.
4. DO from the ZE08-CH2O sensor connects to Digital Pin 2 on the Arduino (optional, used for threshold detection).

Arduino Code:

The following code reads the analog value from the sensor (AO pin) and prints it to the serial monitor. The analog value represents the concentration of formaldehyde in the air.

// Define the pin for the analog output (AO)
#define SENSOR_PIN A0

void setup() {
  // Start the serial communication
  Serial.begin(9600);
  // Initialize the sensor pin as input
  pinMode(SENSOR_PIN, INPUT);
}

void loop() {
  // Read the analog value from the sensor
  int sensorValue = analogRead(SENSOR_PIN);
  
  // Print the sensor value to the serial monitor
  Serial.print("Formaldehyde Concentration (Analog): ");
  Serial.println(sensorValue);

  // Add a delay to make the output readable
  delay(1000);  // 1-second delay
}

Code Explanation:

1. Pin Setup: The analog pin (A0) is configured to read the sensor output.
2. Reading the Sensor Value: The analogRead() function is used to read the analog output from the sensor.
3. Displaying the Data: The sensor value is printed to the serial monitor for easy monitoring of the formaldehyde concentration.
4. Delay: A delay of 1 second is added between readings to ensure the data is not overwhelming.

How the Sensor Works:

• The sensor detects the presence of formaldehyde gas and produces an analog output voltage that is proportional to the gas concentration in the air.
• The output is typically between 0-5V. Higher sensor values indicate a higher concentration of formaldehyde.
• The sensor can also output a digital signal (DO), which can be configured to trigger at a set threshold of gas concentration, but this example focuses on reading the analog output.

Calibration:

The ZE08-CH2O sensor is factory-calibrated, but it is recommended to calibrate the sensor periodically for accurate readings. The sensor may require a warm-up period of about 24-48 hours to stabilize after power-on.

Conclusion:

By following the above steps, you can successfully interface the ZE08-CH2O formaldehyde sensor with an Arduino and monitor the formaldehyde concentration in the air. You can modify the code to trigger actions based on certain gas concentration thresholds or to store the data for further analysis.