Monitor Live Temperature Data Graphically From Multiple Sensors

This project implements a multi-point thermal monitoring system using an Arduino Uno board, a breadboard, connecting wires, and two LM35 temperature sensors. The LM35 is an integrated circuit sensor that outputs an analog voltage directly proportional to the Celsius temperature, eliminating the need for complex external scaling circuitry. Each LM35 requires a power supply, ground connection, and an output pin connected to one of the Arduino Uno's analog-to-digital converter (ADC) pins. As ambient or operational temperatures fluctuate, the analog voltage output from each sensor changes dynamically. The Arduino Uno continuously samples these analog voltage levels through its ADC channels. Inside the microcontroller, the raw integer values from the ADC are mathematically converted into readable temperature values. To visualize the data in real-time, the Arduino transmits these calculated temperatures over the USB serial communication interface to a host computer running the Arduino IDE. By formatting the data streams separated by commas or spaces, the Arduino IDE's built-in Serial Plotter interprets the input as multiple independent data series. This generates real-time, multi-colored graphical waveforms on the screen, allowing an operator to visually track, compare, and analyze thermal fluctuations from both sensor locations simultaneously without needing external display hardware.