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A barometer is a scientific instrument that is used to measure atmospheric pressure. Pressure tendency can forecast short-term changes in the weather.

This time I will show you how to make an advanced barometer. Inexpensive home weather stations only show images of raindrops, clouds, or the sun. More advanced weather stations show the current pressure value as a number, and the pressure change over the preceding few hours as a rough bar graph, mainly for decorative purposes. Such weather stations are significantly more expensive. Also on the market, there are very sophisticated devices designed for sailors, yachtsmen, etc., with high accuracy showing both pressure changes and the current value, but such devices are very expensive. The device I present to you has all the features of such expensive barometers, but it is very simple to build and the price is many times lower. The original project is described in the website and I made some modifications to the code so that now the pressure values are displayed in Hectopascals, and there are also 3 LEDs to show the pressure trend.

It consists of only a few parts:
- Arduino Nano microcontroller
- BMP180 pressure sensor board, which is in direct contact with the surrounding air through this grille for more accurate temperature measurement
- LCD Display 16x2
- two resistors
- and four Leds”

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