My solution was to design and build an Arduino based Humidistat that is keyed to the outside air temperature. When the manual humidistat bit the dust, I thought this would be the perfect opportunity for an Arduino project to automate our home’s relative Humidity. In addition, I am an electronics hobbyist and static electricity is a killer of nice little ICs. If it was set too low we experienced dry skin and enough static electricity that you risked zapping the end of your finger when switching the lights on and off. If we set it too high, condensation would develop on the windows and if left too long, mildew would form. Since it can be 50☏ one day and 20☏ the next during the winter months, the rH level was a moving target. I had a "whole house humidifier" installed when we purchased our home but it had a manual humidistat and nobody knew how to set it (we bought the house second hand). So keeping my home at the right relative humidity (rH) was a challenge. How do you get feedback regarding the measured value of the humidity? My house was either too dry or too humid.
The water solenoid was either on all the time or never came on depending on where we set the dial. I could never figure out if the darned thing was working properly or not. My winter Humidity was controlled by a Honeywell Humidistat. Next I will develop a "development board wich has enough leds, switches with and without hardware debounch, two on board potmeters, and a buzzer, the rest of the I/O points from the main board will be available the headers.I have a gas forced hot air furnace with an Aprilair 560 Humidifier.
this should be a good start for developing your own shield. and is the exact size of the original board, all elevated pins included with text in silk layer, and the mounting holes are also pressent. I still have to figure out to upload files here, But the board developed is for the MEGA 2560. its nice if any of you would also share there files, so we would have a place to go… But after hours of “Google” did not find any good resource. I know that a lot of people are using diptrace for designing PCB’s, and this program gives verry good Gerber Output for PCB production.
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