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 board reads the sensor values and displays them on the LCD. It also writes the temperature readings along with date/time from an RTC module to an SD card every minute. The summaries are stored as text files that can be accessed later for analysis. This allows continuous monitoring and logging of temperature data even when unattended.