I have found this unique circuit which uses the same pair of long leads (<1000m) for the power supply and frequency data transfer from a capacitative humidity sensor. The text with it says to switch off the power when making a measurement., then reconnect it. Is this possible automatically? I don't want to use PIC to do this. Ideally, I'd like the power supply to be on for 55 seconds every minute, with data collection (frequency) in the next 5 seconds.
I also want the frequency to be converted back to a voltage measurement.
Can a 74C14 do this DA conversion (the reverse of the AD conversion the remote humiity circuit is doing)
Please see this corcuit:
https://www.electro-tech-online.com/custompdfs/2005/07/40402di.pdf
I also want the frequency to be converted back to a voltage measurement.
Can a 74C14 do this DA conversion (the reverse of the AD conversion the remote humiity circuit is doing)
Please see this corcuit:
https://www.electro-tech-online.com/custompdfs/2005/07/40402di.pdf