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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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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

Table of Contents

How it works

decision tree

Wire plan

wiring plan

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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