Your starter kit sensors are lying to you with total confidence.
Connect your UNO R3 to your computer and configure the ATmega328P's ADC to read its internal temperature channel. Then print ...
The DS18B20 is a digital temperature sensor from Dallas Semiconductors, which is now part of Maxim (https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf). The ...
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