The Arduino platform is a free and open source electronics platform. Due to their ease of use and inexpensive cost, Arduino-based projects have gained widespread recognition. This is also an arduino-based project that examines Newton’s law of cooling. A DS18B20 waterproof temperature sensor was used for temperature monitoring. Newton’s law of cooling was validated by using temperature data. This article will discuss the Newton’s law of cooling and serve as a guide for verifying it with an Arduino. In fact, the main focus of the article is the experimental setup for Arduino-based temperature monitoring and the verification of the law.