I just got my Uno for Christmas and did my first program, Blink. Awesome little machine. My first part of the project is to connect a CO2 sensor to it and read the results for now. The output is 0-10vdc in a linear curve. 0vdc=0ppm .1vdc=200ppm .2vdc=440ppm..........10vdc=2000ppm which is the top range. My question is how to interface the two. Do I need a voltage of maximum 5vdc for a input or can it read the 10vdc. If I do need 5vdc, what can I use to drop he voltage and keep it linear.
The second part is the sketch. Any help would be appreciated. i would like to read the data and log it to make a graph or some kind of visual organizer.