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I have an Uno and a dht20 temp and humidity sensor. The plan is to have the arduino kick on a fog machine below a certain humidity. I have all the relays and stuff. I know how to code it so that it turns on a pin to activate at a certain threshhold. However, I want to be able to adjust the humidity it kicks on at without adjusting the coding.
The only thing I can think of is to put a potentiometer on the data pin and hope the data output is linear. And makes some marks on the potentiometer so if the arduino reads 100 degrees at 0% on the potentiometer. Then turn the meter till the arduino reads 50 degrees. And again until it reads 25 degrees.
You think that'd work or do you guys have a better idea?
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