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Basement Dehumidification & Ventilation

I was in desperate need of dehumidifying my new workshop.

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I was in desperate need of dehumidifying my new workshop. An energy-efficient way to do this is a controlled ventilation system based on the inside and outside dew points. I reused as many of my old parts as possible to save time and money. An old Arduino in a used case is in control of 3 recycled fans and a humidifier that I had to add for the muggy summer days.

Sources:

[] https://github.com/MakeMagazinDE/Taupunktluefter/blob/main/Taupunkt_Lueftung.ino
[] https://forum.arduino.cc/t/hilfe-bei-einer-Implen-pumpensteuerung/509398/7
[] https://wokwi.com/arduino/projects/324484140498944595
[] https://www.instructables.com/How-to-Use-LCD-HD44780-I2c/
[] https://github.com/mggates39/MyDelay

The program calculates the inside and outside dew points every 10 seconds. If the inside dewpoint is above 6.3degC, dehumidification is needed. 

(operating mode: LUEFT): The fans are switched on when the outside dewpoint is 5degC below the inside dewpoint.  
(operating mode: ENTF): If the outside air is not suitable to dry the basement, a dehumidifier is started. While it is running, the condensate is collected in a reservoir with a level switch and a pump. 

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