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Arduino-Based Digital Thermometer
Thermometers are vital across industries, from weather studies to medicine and scientific research. Maintaining precise temperatures in storage, labs, and incubators is crucial. This project details an Arduino-based digital thermometer designed for accurate room temperature monitoring.
Apparatus for Construction
1
Breadboard & Wires
Essential for prototyping circuits and connecting components.
2
LM35 Sensor
Precision centigrade temperature sensor, a core component.
3
Potentiometer
10K Ohms potentiometer (POT 103) for adjusting settings.
4
LCD Display
16x2 inches LCD for clear temperature readings.
5
Arduino
The microcontroller platform for processing data.
Circuit Diagram
The diagram below illustrates the connections for the Arduino-based digital thermometer. This visual guide is crucial for assembling the components correctly and ensuring proper functionality.
LM35 Temperature Sensor
The LM35 is a precision centigrade temperature sensor, providing an output voltage directly proportional to temperature. It operates from -55°C to +150°C with ±0.75°C accuracy, improving to ±0.25°C at room temperature. Its output changes at 10 mV/°C, meaning a 1°C change results in a ±10 mV voltage shift. It's a 3-pin IC, as shown in the figure.

A similar sensor, LM34, measures temperature in Fahrenheit directly.
How It Works
01
Temperature Monitoring
The LM35 sensor continuously monitors room temperature, generating an analog voltage proportional to the temperature.
02
Analog to Digital
This analog data is fed into the Arduino via pin A0. The Arduino then converts this voltage into digital temperature readings.
03
Display Output
The converted digital temperature value is accurately displayed on the 16x2 LCD screen in centigrade.
04
Customizable Rate
The rate at which temperature changes are captured can be adjusted within the Arduino code.
Proteus Simulation
The Proteus simulation provides a virtual environment to test the circuit design before physical implementation. Below are images of both the Proteus simulation and the actual hardware setup, showcasing the completed digital thermometer.
Hardware
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