philba
New Member
I have a project that I'm thinking about doing. It's a programmable food dehydrator. One of the key ideas is to sense the amount of moisture being removed and use that to track a drying profile. The advantage would be that the dryer would shut down before the food is overdried. I would compare input air humidity vs output air humidity so I'd need 2 sensors.
Unfortunately the humidity sensors I've looked at seem to be very slow (measured in minutes) and quite expensive. Most seem to be capacitive. Anyway, I've thought about building capacitive based sensors myself but don't know if that's the best approach - is the different so small as to be a problem. Are there better approaches? Maybe ultrasonic transmission time? RF absorbtion?
Unfortunately the humidity sensors I've looked at seem to be very slow (measured in minutes) and quite expensive. Most seem to be capacitive. Anyway, I've thought about building capacitive based sensors myself but don't know if that's the best approach - is the different so small as to be a problem. Are there better approaches? Maybe ultrasonic transmission time? RF absorbtion?