Basic weather system, in/out temp and humidity with heat index, dew point, pressure and weather prediction and time and date.
Project showcase by Fathead
The software library to calculate moon age, sunrise and sunset time.
Any sensors can be used just make sure the correct libary and code is corrected to allow for what ever sensor it may be
I have updated the diagram on Fritzing to make it a little clearer for you hope it helps
The ds3231 has the option to allow the I2C to piggy back of the unit. So it can be connected to another device as in my case the 20x4 lcd.
The arduino uno has the 2 pins for i2c (as stated above)
SCL > A5
SDA > A4
Any I2C device should be connected to the these pins on the UNO
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