Dew point provides this value, and is calculated based on temperature and relative humidity readings.īecause finding the dew point requires taking in multiple sensor values and performing arithmetic on them, a programmable micro controller like the Arduino is ideal for this project. Thus, the best solution is to use two sensors that measure the total moisture content of the air. Colder air at the same RH will contain less moisture overall. Relative Humidity only measures the moisture content of the air relative to the temperature it is at. The next step is two use two humidity sensors and compare the inside values. These systems have the obvious flaw of not knowing if the outside conditions might actually be worse! The thermostat will ventilate once a set temperature is passed, the humidistat a humidity reading. When choosing to ventilate an environment like this, the two commonly available options are a thermostat or humidistat. If you are storing items like corrodible metals or mold-prone documents in a basement or attic, your ultimate goal is not to decrease temperature, but to decrease the absolute moisture content of the air (A/C provides this along with cooling the air). When storing materials in un-airconditioned spaces, the biggest enemy is not actually temperature, but moisture content. The only hiccups you might encounter will be related to driving the I2C bus over the long wires used for the sensors. Also, the libraries used by the code make the programming very straightforward. The project mostly uses the I2C serial bus which makes the wiring very simple. This build should be suitable for Arduino beginners. It's worth spending an extra $10-$20 for a project that actually will work! This paid off, as these sensors are very precise and stable. Instead of attempting a complex calibration procedure, I ordered some BME280 sensors, which are based on a Bosch chip and are meant for smartphones. This is because I found they demonstrated poor precision: I purchased three different sensors and had three humidity values which differed between 5-10%. Unlike many other humidity and temperature projects out there for Arduino, I do not use the popular DHT style sensors. Inside the control box there is a display that provides various parameters including the current status of the sensors along with statistics It consists of two remote sensors, and a central control box. It triggers a relay to drive a fan if there is less moisture in the outside air, bringing down the water content of the inside air. This simple Arduino project, which I'm calling ArDewpoint, uses two sensors to compare the moisture content inside and outside of a structure.
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