This document describes a temperature monitoring device that uses LM35 temperature sensors, displays the temperature readings on an LCD screen, and records the data to an SD card. The device has 4 LM35 sensors to measure temperature in each corner of a room. An Arduino UNO collects the temperature readings and displays them on the LCD. It also saves the temperature data every minute to the SD card along with the date, time, and location from the RTC module. The summaries are stored as text files that can be accessed for analysis. The device is designed to continuously monitor and save temperature readings even when unattended.