Need co2 levels displayed on lcd in real time in percent. For example 40,000 ppm will be displayed as 4.00%. It will also show the valve status (open or closed) Buttons on LCD will control the co2 threshold. Once the co2 reaches the threshold the valve goes off. Below the threshold the valve is open. Threshold is set in percent as well. So if set at 4% the valve will stay open until it reaches 4% and then close.
Let me know if you have further clarifications.
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I have working with Arduino projects the last four years. The type of work described by you is within my skills. I am very interested to assist you in your development needs.
I have used lcd, keypad and co2 sensor with arduino before. I think understanding what you want. I will test the shield that i make for you and you sure that it will be worked. Best regards, Yasin Kaya