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Using an Arduino to read two DHT22 temperature and humidity sensors, calculate absolute humidity and switch on or off a fan to get the wet air out of the basement

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sketch_fancontrol		sketch_fancontrol
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Arduino humidity fan control

This Sketch is used to control an Arduino Nano which is used to get the wet air out of a basement. It'll

read two DHT22 sensors to get the temperature and humidity from the inside and outside world
calculate the absolute humidity
decide, if it is useful to blow the air out
use a relais to switch on or off a fan
display data on a 20x4 I2C-LCD
log the measurements to an SD card, using a RTC module for timestamping

Bugs

the sketch crashes after a random (hours .. days) time due to unknown reason

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Using an Arduino to read two DHT22 temperature and humidity sensors, calculate absolute humidity and switch on or off a fan to get the wet air out of the basement

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