SEN0219 CO2 NDIR sensor

userHead rva 2017-04-05 22:41:51 2271 Views3 Replies
Hello I have received this sensor , And I use the code that is available.

If I put the sensor in the outside atmosphere where the CO2 concentration is about 400 ppm .. It gives me :

Concentration : 1080 ppm
voltage : 743 mv
analog read : 177

What did I wrong ?
2017-04-07 18:32:45 Hi

I am not very clear about the Mediatek linkit duo. Is possible to be related to the working voltage? You need to modify some code if you used a 3.3V controller. Please check this link:

And there is a serial port indeed, but we dont lead to this pin, just used a ADC. I attached a schematic to the attachment, please check if you need.
[attachment=0]Infrared CO2 Sensor 0-5000ppm原理图.rar[/attachment]
userHeadPic Wendy.Hu
2017-04-06 17:55:12 I'm using a Mediatek linkit duo with a shield and a gravity IO Module . Others sensors do not produce such deviation of measurement on this hardware.
I did a preheat of more than an hour to be sure.

Do you kown what is the second port on the sensor ? as it seems to be a modified version of the winsen MH-Z14 , there should be a serial port available.

on a 2nd controller : an old Arduino YUN , with the gravity IO Module. BETTER RESULTS
the concentration inside (my office) is +- 610 ppm
userHeadPic rva
2017-04-06 11:31:47 Hi

It looks like there ares something wrong indeed. Would you give me some pictures about your data or your diagram? What microcontroller you are using? And did you preheat several minutes to see the CO2 data? Same problem?
userHeadPic Wendy.Hu