I have CO2 sensor like these: 1. http://www.ebay.com/itm/MG811-MG-811-CO2-Carbon-Dioxide-Sensor-Module-for-Arduino-/321171363099?pt=LH_DefaultDomain_0&hash=item4ac74e151b 2. http://www.ebay.com/itm/MG-811-CO2-Carbon-Dioxide-Sensor-Module-for-Arduino-other-MCUs-/251404930311?pt=US_Amplifier_Parts_Components&hash=item3a88e6cd07
it have AOUT and DOUT, need help with connecting via DOUT to my arduino mega, should i connect it to Digital pins directly or TX pins? Another question is how to work from IDE , i mean , can somebody help with sketch?
When i connected by example, from somewhere in the Internet via analog, it returns a value from 70 to 80 while breathe exhaling, I read something about the influence of voltage, sensor heating, also some physical constants of the Faraday number to calculate CO2 in ppm, but have not figured out. can anyone explain how to achieve the normal data from the sensor in ppm, and how often they can i get from it (for ex. every min or several or m.b. less), the best course with digital.
Upd: i can use also analog, but i have wire about 10 meters from arduino to sensor, is it ok?