How to make a Digital Thermometer using Arduino and LM35 Temperature Sensor

Arduino is a wonderful creation of modern electronics. Now a days almost every electronics hardware can be designed using arduino. Specially PLC based automation can be designed with arduino. Again Arduino is very suitable for making simple Electronics project. Today I will show you how to make a Digital Thermometer  using Arduino and LM35 Temperature sensor.

Digital Thermometer is a such kind of device which can measure the temperature and can display it digitally. For making a digital thermometer we will use a sensor, An arduino board, And a Display. Sensor will helps us to receive the temperature from environment, Arduino will collect the data from sensor and process the data to calculate the temperature and Display will be used to show the temperature to user.

If you want to know more about arduino then read this article:
What is Arduino? What can we do with Arduino?

For making a Digital Thermometer we need all the components given below:

- Arduino Uno R3

- LM35 Temperature Sensor

- Some Jumper Wire

- 16x2 LCD Display

- 1Pcs 10K Variable Resistor

- A Breadboard

Let’s start to make the digital thermometer. I will show all the process step by step. Follow this full tutorial to make your own Digital Thermometer.

Components Connection: 

At first we need to connect all the components. For connecting them I will use a breadboard. It will help us to connect all components easily. I will connect all the components as the circuit diagram. I have share the circuit diagram below.

I am using a 10K Variable Resistor with the lcd display to control the brightness of display. Here is the connection of the variable resistor:

LCD Connection:

LCD Pin 1, Pin 5 and Pin 16 will connect with GND

LCD Pin 2 and Pin 15  will connect with VCC

LCD Pin 3 will connect with the output of the variable resistor

LCD Pin 4 will connect with Arduino Pin 8

LCD Pin 6 will connect with Arduino Pin 9

LCD Pin 11 will connect with Arduino Pin 10

LCD Pin 12 will connect with Arduino Pin 11

LCD Pin 13 will connect with Arduino Pin 12

LCD Pin 14 will connect with Arduino Pin 13

[Note: LCD Pin 7 to Pin 10 not using here]

Sensor Connection:

The LM35 Temperature has 3 Pins. The first pin will connect with VCC and third pin Connect with GND. The middle pin will connect with Arduino Analog Pin A0.

So our final circuit  will look like this:

Ok now it’s time to upload the sketch file in Arduino. You can download the file from below:

If you upload the code in your arduino board arduino will starts to measure the temperature of environment.

I have also shown the full process in this video.

If you want to make a permanent temperature meter then you can use a PCB (Printed Circuit Board).

If you want to learn how to make a pcb at home then follow this video: How to make a PCB ( Printed Circuit Board ) at home [Step by Step Full Porcess]

Ok, that’s ends today. I hope everyone will be able to make your own digital thermometer. If you have any question about this tutorial then feel free to ask me. I shall try my best to help you.