Note: Please see my Version 3.2 post for the current design: Link
Operation:
1. When the humidity reaches 18% and the outputs for two solenoids, a high volume air pump, and the heater are turned on
2. When the humidity drops back to 10% the heater is turned off and the two solenoids and a high volume air pump continue to run for 75 minutes to purge any remaining moisture (once the desiccant tube cools the humidity will drop from 10% to 0.7%)
3. All AC outputs are turned off and monitoring continues
* The LED on the PIC18F board flashes one time (for 1/3rd second) for each 10% of humidity followed by one time (for 1/5th second) for each 1% of humidity, so that it is easy to know the current humidity level (5 long flashes with 7 short flashes means the humidity is between 57%).
Interested in how I got to Version 3.2? You can checkout the previous versions:
Version 3.2: Change to PVC piping to insert a plug with a small hole on the sensor/dry air side Link
Version 3.1: Change to custom humidity control programming: Link
Version 3.0: Change to custom humidity control PCB: Link
Version 2.0 Change of heating method: Link
Version 1.0: Link
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