This isn’t about connecting a temperature sensor in your Arduino. This build is about using the temperature sensor in your clock.

This articles describes how you can use I2C (TWI) communication, Arduino and temperature sensors to measure 3 different temperatures. It can be very ...

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So if you want to modify it to add more fans, change the message on the LCD, or use a different temperature sensor, you can easily give it a go even if you're a beginner at Arduino coding.