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Top 5 Positive Customer Reviews for co2 infrared
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.
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.