Introduction

DFRobot released its latest high-precision analog infrared CO2 sensor. The effective measuring range is from 0 to 5000ppm. This sensor is based on non-dispersive infrared (NDIR) technology and has good selectivity and oxygen-free dependency. Additionally, its service life is up to 5 years! It integrates temperature compensation and supports DAC output. Most importantly, the product is easy to use and is compatible with all types of microcontrollers with ADC function. In addition, this product is a high-performance sensor that combines technology of mature infrared absorption gas detection with precision optical circuit design, as well as sophisticated circuit design. It has characteristics such as high sensitivity, high resolution, low power consumption, fast response, anti-water vapor interference, no poisoning, high stability and long life. This sensor is directly compatible with the DFRobot Arduino IO expansion board thanks to its external DFRobot Gravity interface. This characterizes the simplicity of use of the sensor since it is plug and play and does not need additional wiring. This product could be widely used in HVAC, indoor air quality monitoring, industrial process and security protection monitoring, agriculture and animal husbandry production process monitoring.

Feature

• Waterproof and anti-corrosion
• High sensitivity
• Low power consumption
• Excellent stability
• Temperature compensation
• Excellent linear output
• High cycle life
• Anti-water vapor interference
• No poisoning

Specification

• Gas Detection: Carbon Dioxide (CO2)
• Operating Voltage: 4.5 ~ 5.5V DC
• Average Current: <60mA @ 5V
• Peak Current: 150mA @ 5V
• Output Signal: Analog output (0.4 ~ 2V)
• Measuring Range: 0 ~ 5000ppm
• Accuracy: ± (50ppm 3% reading)
• Preheating Time: 3min
• Response Time: 120s
• Operating Temperature: 0 ~ 50 ℃
• Operating Humidity: 0 ~ 95% RH (no condensation)
• Service Life: >5 years
• Size: 37mm * 69mm

Board Overview

Calibration

The sensor should be calibrated regularly. The cycle time should be no more than 6 months. There are two calibration methods.

• Method 1: Manual zero calibration Manual calibration of zero point is to short-circuit the HD and GND of the sensor (as shown below) to calibrate the zero point. It always needs to last for more than 7 seconds. Before calibrating the zero point, make sure that the sensor runs stably for more than 20 minutes at a concentration of 400ppm.

• Method 2: Automatic zero calibration The automatic calibration function means that the sensor will intelligently judge the zero point according to the environmental concentration and calibrate itself after a period of continuous operation. The calibration cycle starts from power-on operation, and it is automatically calibrated once every 24 hours. The zero point for automatic calibration is 400 ppm. The automatic zero calibration function is suitable for office environment and home environment.

Tutorial

In this tutorial, we'll show you how to use DFRobot Infrared Sensor within 5 minutes.

Requirements

• Hardware

  • DFRduino UNO x 1
  • DFRobot Gravity: Infrared CO2 Sensor
  • Gravity: IO Expansion Shield for Arduino V7.1

• Software

  • Arduino IDE Click to Download Arduino IDE from Arduino®

Connection Diagram

Data Analysis

When the IR CO2 sensor get 5V power supply, it will output 0.4~2V analog value, corresponding to 0~5000 ppm; And when the sensor finds faults during the self-checking process, it will output 0V.

Sample Code

/***************************************************
 * Infrared CO2 Sensor0-5000ppm
 * ****************************************************
 * This example The sensors detect CO2
 *
 * @author lg.gang(lg.gang@qq.com)
 * @version  V1.0
 * @date  2016-7-6
 *
 * GNU Lesser General Public License.
 * See <http://www.gnu.org/licenses/> for details.
 * All above must be included in any redistribution
 * ****************************************************/
int sensorIn = A0;

void setup(){
  Serial.begin(9600);
  // Set the default voltage of the reference voltage
  analogReference(DEFAULT);
}

void loop(){
  //Read voltage
  int sensorValue = analogRead(sensorIn);

  // The analog signal is converted to a voltage
  float voltage = sensorValue*(5000/1024.0);
  if(voltage == 0)
  {
    Serial.println("Fault");
  }
  else if(voltage < 400)
  {
    Serial.println("preheating");
  }
  else
  {
    int voltage_diference=voltage-400;
    float concentration=voltage_diference*50.0/16.0;
    // Print Voltage
    Serial.print("voltage:");
    Serial.print(voltage);
    Serial.println("mv");
    //Print CO2 concentration
    Serial.print(concentration);
    Serial.println("ppm");
  }
  delay(100);
}

Expected Results

Open your IDE serial monitor and wait for 3 minutes (preheat process), then you'll see the finial data. (Indoor Temperature: 30℃)

FAQ

More Documents

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