digital remote thermometer mini projectdigital remote thermometer mini projectdigital remote thermometer mini project
digital remote thermometer mini projectdigital remote thermometer mini projectdigital remote thermometer mini project
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A Thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer) in which some physical change occurs with temperature, and (2) some means of converting this physical change into a numerical value (e.g. the visible scale that is marked on a mercury-in-glass thermometer). Thermometers are widely used in industry to control and regulate processes, in the study of weather, in medicine, and in scientific research.
There are various principles by which different thermometers operate. They include the thermal expansion of solids or liquids with temperature, and the change in pressure of a gas on heating or cooling. Radiation-type thermometers measure the infrared energy emitted by an object, allowing measurement of temperature without contact. Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature, and has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. This is the reason behind mercury being used in thermometer.
Some of the principles of the thermometer were known to Greek philosophers of two thousand years ago. The modern thermometer gradually evolved from the thermoscope with the addition of a scale in the early 17th century and standardisation through the 17th and 18th centuries.
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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.
Temperature Indicator Using Microcontroller
Temperature Indicator Using Microcontroller
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 indictor 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 output voltage proportional to the temperature. The advantage of using LM35 is that it does not require any external calibration technique and it has accuracy of ±0.4 degree Celsius at room temperature. It draws only 60µA from supply and possesses low self heating. Thus the chances of error get minimized.
This article is about a simple 0-100°C digital thermometer with 1°C resolution using 8051. The circuit is based on LM35 analog temperature sensor, ADC0804 and AT89S51 microcontroller. LM35 is an analogue temperature sensor IC which can measure a temperature range of -55 to 150°C. Its output voltage varies 10mV per °C change in temperature. if the temperature is 32°C, the output voltage will be 32 x 10mV = 320mV. ADC 0804 is used to convert the analogue output voltage of the LM35 to a proportional 8 bit digital value suitable for the microcontroller. The microcontroller accepts the output of ADC, performs necessary manipulations on it and displays it numerically on a 2 digit seven segment LED display.
