Temperature Indicator using PIC Microcontroller: Electronics Project

Hi friends, today we will see how to make temperature indicator using PIC microcontroller. The basic aim of this project is to make you familiar with PIC microcontroller. It also explains how LM35 and 7 segment displays can be interfaced with PIC microcontroller.

Components required

Following is a list of components required for temperature indicator using PIC microcontroller – mini project:

  • PIC microcontroller (PIC16F676)

  • 4 digit (or 3digit) seven segment display (Common cathode)

  • Temperature sensor (LM35) IC

  • 5V DC power supply

Circuit diagram

The following figure shows a circuit diagram of temperature indicator using PIC microcontroller.

[caption id="" align="aligncenter" width="939"]Temperature Indicator Using Microcontroller Temperature Indicator Using Microcontroller[/caption]


In this mini project, we have used PIC microcontroller and a four digit seven segment display is interfaced with it. For sensing the surrounding temperature we have used a temperature sensing IC i.e. LM35. You can use a voltmeter to crosscheck whether the indicator giving correct output or not. The output of the temperature in terms of volts will be in the range of mV.

Working of LM35

LM35 is an integrated temperature sensor. It produces an output voltage proportional to the temperature. The advantage of using LM35 is that it does not require any external calibration technique and it has an accuracy of ±0.4 degree Celsius at room temperature. It draws the only 60µA from supply and possesses low self-heating. Thus the chances of error get minimized.


Click here to download the project content. It consists of C program, Proteus design, HEX file for PIC microcontroller and circuit diagram.

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