In this instructable I’ll show you how to build a basic Thermometer / Barometer clock using a Raspberry Pi 2 with a BMP180 I2C sensor displaying on an Adafruit 4 digit 7 segment I2C display. The Pi also uses a DS3231 real time I2C clock module to keep time when the Pi is restarted.
The clock loops through 4 stages for 5 seconds each. First it shows the temperature in Celsius, then in Fahrenheit then the barometric pressure in kPa *(it walks this number to the left due to limited number of digits) and finally it shows a trend of barometric pressure change between now and the average of the previous hour.
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