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.
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Temperature Indicator Using Microcontroller[/caption]
Theory
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.
Download
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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