Abstract
Temperature affects to quality of the food stored. For that, it needs a refrigerator which can store food to preserve the food. From the survey at Food & Beverage store, to make sure a refrigerator operate at proper temperature, the temperature measurement must be conducted regularly every day and it can take quite a bit of time. However sometimes this measurement not done regularly cause of load of the crew. Therefore, the Smart Temperature Warning System using SIM800L and ESP32 is important to help crew to measure the temperature of refrigerator automatically, compare it with threshold temperature and give a warning in sound and notification via email and SMS when the measured temperature is not appropriate with the reference temperature. Using this Smart Warning System at F&B stores can maintain food quality and increase crew efficiency and also can alarm if any error with freezer temperature. The result is system will operate 24 hours and will alarm if any temperature error without any crew intervention.
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