Hey here is a little controller i built, because there wasnt any on the market that fit my need, and i was too cheap to buy a co2 controller... even tho this son of gun cost me 3x what a factory built one would by the time i ended up with a properly working unit.
This controller will :
Monitor and control Co2 ppm from 0ppm - 10,000ppm, and will turn on and off a Co2 regulator based on your Co2ppm and Dead Band Settings.
Monitor your air temp inside your grow room from -50F - +200F. (Well beyond what is normal )
If running a hydroponic system, this unit will monitor your reservoir level via a float sensor installed onto the side of your reservoir or mounted to your water pump.
The Dead Band setting incase you are not familiar with Dead Bands it is an area of a co2 range where no action occurs. IE: If you set your Co2 set to 1200ppm and have a Dead Band setting of 100ppm. The controller will allow the Co2 ppm to drop to 1100ppm before bringing back on the co2 reg. Then shut the reg back off again at 1200ppm or greater. This is important so you do not short cycle your Co2 Reg which means to turn it on and off multiple times and hour. Witch can cause premature failure.
As well as monitor and control co2, temp and res level, This unit also has a built in clock for keeping track of the time of day. Its very useful if you are like me and keep a physical written log of PH, Temp, Res level, Co2 and nute solution PPM.
== See exactly how this thing works here! ==