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Embedded Linux Realtime Humidity Controller |
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Using a Cirrus EP9301 ARM9-based controller, several solid state relays, and a capacitive humidity/temperature sensor we built a realtime humidity controller for environments that have requirements for tight humidity constraints. The ARM was controlled by embedded Linux, and we developed two kernel mode device drivers; the first controlled the solid state relays which controlled the power to commercially available humidifier and dehumidifier equipment, and the second driver read temperature and humidity from a Sensirion SHT11 humidity and temperature sensor. The system formed the basis for a feature article in the December 2009 issue of Linux Journal (the article can be found here).
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