Simple CO2 meter using Arduino UNO-Mega board and popular CO2 sensors (SenseAir S8, Sensirion SCD30, Winsen MH-Z14 or 19 and Cubic CM1106). To change the alarm level from 1000 ppm, by default, to another value between 700 and 1300 ppm you must press button S2-A2 in the shield version, or place an additional cable or switch from pin A3 to A5 in the parts version, for more than 5 seconds and the message "BEEP" will appear, then the value to which it is programmed. Normal mode: When the sensor is turned on, the BEEP message appears and a number between 700 and 1300 shows the alarm level that we have programmed. You will find the CO2 sensors used in parking lots to support the working staff and general public by monitoring the CO2 levels.

If any of you have used these kind of sensors before and have had a positive experience with the sensors you purchased, please let me know the details. The circuit is very simple as we are only connecting the MQ-135 Sensor and OLED Display module with Arduino Nano. OLED (Organic Light-Emitting Diodes) is a self light-emitting technology, constructed by placing a series of organic thin films between two conductors. There are two options for the sensor assembly: the easiest is using an Arduino Multifunction Shield (Shield), which already includes a 4-digit display, buzzer and buttons, making the assembly much easier. Once I have 1 reading from the Vernier and 1 reading from the CO2 Cozir sensor, I note down the data points.

This is a simple and low cost sensor version of a CO2 meter built with the most common materials on the market: an Arduino UNO and the three most popular low cost REAL CO2 sensors: Sensirion SCD30, Winsen MH-Z14 or 19 and Cubic CM1106. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average.

With a perfectly blended team of Engineers and Journalists, we demystify electronics and its related technologies by providing high value content to our readers. Then open your serial monitor and wait for some time (preheat process), then you'll see the final data. timeToString ( ) ; 129 130 for (int i = 0 ; i