This is my first post. I am excited to be here.
My final goal is to create an environmental test chamber for plant propagation by retrofitting an old refrigerator. Any comments, questions, advice, or resources are welcome, although this is not specifically why I am posting. Eventually, I would love pH and EC monitoring, and a whole host of other features including remote data logging and control, but the prototype will be basic to see if I can get the fundamentals achieved: control over temperature, RH, and CO2 levels, within a band.
I have seen The APDuino Project and it seems like a lot of what I want, but I don't think the sensors used in this build are accurate enough for my purposes. As I am very very new, I am not sure to what extent they can be changed with that build. I also worry about rights eventually interfering with my research.
I am trying to lay out the project, and have been looking at the sensors available, as these seem like a key bottleneck to accurate measurements. Frankly, I am overwhelmed by the choices available. I am also too new to know what to look for in terms of reliability and the honesty of accuracy claims.
Ideally, I would like to have the following tolerances: Temp +- 0.25C (may be willing to settle for 0.5C) RH +- 2.5% CO2 +- 50ppm
Because I would like to be able to have confidence in my readings to Temp 0.5C RH 5% CO2 100ppm (feel free to correct me if my understanding of tolerances is off, still a student)
My general reactions to the sensors I have seen are a happy disbelief at the low prices coupled with a healthy dose of scepticism that they will read true.
All comments, questions, criticisms and advice appreciated.