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Top 5 Positive Customer Reviews for co2 infrared
Works perfectly fine. I have compared to "Netatmo" weather station and this is a precise sensor as the station was showing random numbers and this sensor was consistently increasing ppm during the day and dropping during the night. I am very satisfied, only the price is a bit high.
The sensor was unexpectedly cancelled. After sending a message to the seller they shipped the sensor again. Total delivery time was somewhat longer than to be expected with Aliexpress shipping method. The seller was requested to ship a 2000ppm version of the sensor. The label read 10000 instead. My mail about this was not answered.. After some digging on the internet I found a command to adjust the sensors sensitivity. It can be set at a maximumm of 1000ppm, 2000ppm, 3000ppm, 5000ppm. After running one day the sensor finally reads about 400ppm in open outside air (needs a day to calibrate correctly). Also I could reach the maximum of 1000 or 2000 when set to that setting. I use an Nodemcu V3 ESP8266 board, and I read the PWM output, it is stable. I also get a readout on the analog pin and over serial.
Sensor works well, but it was delivered during 2 month. I know, that it doesn’t depend on the seller a lot, but two other sensors from another sellers were delivered much faster. One of them was send in same period of time, as this sensor.
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