DFRobot Gravity: Analog CO2 Gas Sensor for Arduino | CO2 Gas Detector

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LibreCO2: Simple CO2 meter using Arduino UNO and CO2 low cost sensor (Sensirion SCD30, Winsen MH-Z14 or MHZ-19 and Cubic CM1106). Serial.println("low"); //print "low" this is demonstrating that the Arduino is evaluating the Co2 as a number and not as a string Finally, you must tell the software which COM port on your computer the Arduino Uno board is connected to. Go to Tools > Port > and choose the correct COM port.

The code is the most basic and the.hex file is published for the programming of the Arduino with the software Xloader. You don't have to install Arduino software to compile and program the code. If you are searching for Wi-Fi or Bluetooth connectivity, you can find many open source alternatives on a list at the end of the guide, for example CanAirIO. The CO2 meter uses the most popular components on the market, not the most advanced, and the simplest building without the need of an iron solder.

I had made a mistake when linking to the MH-Z19B datasheet and repeated the MH-Z19C datasheet. It is now corrected. Thank you very much for the warning. The earth’s Atmospheric CO2 level is increasing day by day. The global average atmospheric carbon dioxide in 2019 was 409.8 parts per million and in October-2020 it is 411.29. Carbon dioxide is a key greenhouse gas and responsible for about three-quarters of emissions. So CO2 level monitoring has also started to gain importance. You also have an alternate option to simply detect whether the Co2 levels are above the preset limit. define REACTION_VOLTGAE (0.030) //define the voltage drop of the sensor when move the sensor from air into 1000ppm CO2

The sensors MH-Z19B and MH-Z19C are factory calibrated and, under normal conditions, manual calibration should not be necessary, I recommend that you calibrate it when you receive it and periodically. If you want to edit and compile the code please install the Arduino software in Windows, Mac or Linux: These two jumper cables are important as they will allow both the EZO-CO2 Sensor and the Arduino Uno board to communicate with each other. This very narrow supply voltage is very difficult to keep stable and many of the USB power supplies we use provide values above and below this voltage. A 0.04% concentration is referred to as 400 PPM. PPM stands for parts per million. 4. Which sensor should I choose for the Indoor Air Quality application?

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Update the lin below with the value you came up with to complete the calibration. #define ZERO_POINT_VOLTAGE (0.220) //define the output of the sensor in volts when the concentration of CO2 is 400PPM FAQs About The CO2 Sensor And Arduino Projects Below is a list of tools we used for this tutorial. You do not need to have ALL these tools, although they will greatly speed up the process. The following guide explains how to install Arduino on Windows, Mac or Linux and is very explanatory:

In this first test I have kept the sensor running for about 10 hours powered by a programmable laboratory power supply which modified the supply voltage every 60 seconds between 4.5V and 5.15V in 0.5V steps. That is: I powered the sensor at 4.5V for 60 seconds, switched to 4.55V for another sixty seconds, 4.6V for another sixty seconds and so on (at 5.15V I switched to 4.95V for 5 minutes, to stabilise it, and started the cycle again at 4.5V). The colors of the jumper cables chosen for this tutorial match the wires within the EZO-CO2 cable housing. Organization is key! It’s worth noting that CO2 ppm meters should be calibrated periodically to maintain accurate measurements. The calibration process involves exposing the meter to a known CO2 concentration (usually outdoor air) and adjusting it accordingly. The connection of the I2C Oled display module with the Arduino remains exactly the same and we don’t need to change any wires, we can now add our MQ135 Sensor with the Arduino Uno or Arduino Nano to find the CO2 Concentration. But, before I am going to explain the wiring first let’s take a look at the MQ135 Sensor. MQ135 Specifications:Model MH-Z19B 400~2000 ppm range, which is a more modern and improved version. This version has an accuracy of 50 ppm + 3% of measurement. OLED (Organic Light-Emitting Diodes) is a self light-emitting technology, constructed by placing a series of organic thin films between two conductors. A bright light is produced when an electric current is applied to these films. OLEDs are using the same technology as televisions, but have fewer pixels than in most of our TVs.

As we know that analog input create value are from 0 to 1023 we will used the map function the minimum value will be 400 and the maximum value will be 5000 for the ppm value Notice how in the power supply period with 4.95V for 5 minutes the MH-Z19C slowly stabilises. Factory calibration

Recommendations

I recommend that you look carefully at the power requirements of your specific sensor. Depending on the version, the acceptable operating voltage may vary. It has good selectivity, long lifetime and other features, such as integrated temperature compensation. In addition, there is another problem that, although it can be minimised with a good design, is not easy for the average hobbyist: These types of sensors have a relatively high power consumption, which causes drops in the power supply produced in the wires of the circuit (it is normal that these drops can be 0.2V~0.4V and even higher), which makes it extremely difficult to have a stabilised power supply voltage.