DFRobot Gravity: Analog Infrared CO2 Sensor for Arduino (400~5000 ppm)

Easy to use -- connect to 5V, 0V, and an ADC input and measure the voltage and calculate how many PPM of CO2 there is. I used an ADS1115 on a Raspberry Pi, but an Arduino would work just fine, as would most other ADCs. It is interesting to note that the concentration does vary, and is higher inside when windows have been closed for a while.

Copped this to monitor CO2 levels in my indoor garden hydroponics garden. Sensor never provided consistent readings and was a bear to program. I am looking at purchasing a dedicated cater co2 Sensor monitoring system from a reputable manufacturer in the future.

This sensor is the only one I havent been able to get a reading on for co2. The IR lights come on and it does recieve inaccurate input. I have another co2 sensor that does work great from the same company as well I believe that works great and I have a co2 sniffer device I calibrate it to. This one eventually burnt out on me and something got hot and fried during testing××××××I bought a second one. It works perfectly with my arduino nano and arduino Uno. It accurately releases CO2 into my greenhouse controlling a relay.

It was very easy to set up, you need to short pin 8 to ground to calibrate it for ~10s while the sensor is exposed to fresh (~410ppm C02) air, then you're set to start playing with it.We have been using it to track C02 levels in our apartment to see what's up with airflow / fresh air.I dropped a star because they put a set of red leds on it that blink, and every time they blink your data gets skewed (you can see this quite apparently in the attached spiky graph, as well in other reviews) but if you apply a lowess filter you can get a very clear look at your C02 levels. The manufacturer does recommend that you filter the output if you want a smooth graph.

Only has 0-2V output which is VERY imprecise if you're reading it with the arduino adc. Much better to just buy the MH-z14a sensor for 1/3rd the price and use the UART interface.

It has to be calibrated every 24 hours (they say) using the method shown in the image I've attached. I've onlt had it a few hours so I can't say more now.

I followed and tried many example programs on Arduino and was not able to get it reading accurately. Read around 9,000PPM when it should have been around 400PPM.

does not read accurate co2 lvls. even after manual recalibrating and waiting 48 hrs for self cal. don't waist your money.