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CO2 level controller for grow room or greenhouse.
Circuit responds to analog output of CO2 sensor to control a CO2 generator in grow room or greenhouse. This circuit uses a 0-5v signal representing CO2 concentration of 0-2500ppm (cutoff @ 2000). Any sensor with analog output will work but a voltage divider may be necessary to achieve 0-5v for Arduino/Atmel onboard DAC. Software supports ON/OFF control but PID or "fuzzy logic" could be implemented via software. Circuit could also be used to control ventilation or economizer to reduce CO2 level in building with minor changes to code.