Arduino Based Digital Thermometer
Thermometer is a temperature
measuring instrument. There are different principles that can be used to
measure the temperature like thermal expansion of solids or liquids, pressure of gas, measurement of infrared energy etc.
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Based on the principle used, the construction and functioning of the thermometer can change but ultimately it ends up measuring the temperature. Thermometers are used in industries, weather studies, medicinal field and scientific research.
Based on the principle used, the construction and functioning of the thermometer can change but ultimately it ends up measuring the temperature. Thermometers are used in industries, weather studies, medicinal field and scientific research.
For all the above mentioned and
many more applications, thermometers are
often used to measure the temperature.There are different types of
thermometers available for different purposes. The most commonly found
thermometer is a medical or clinical thermometer, which is a mercury in glass type thermometer.
They are used to measure the
temperature of human body and is an example of an analogue thermometer. Now a
days, the use of digital thermometers is
increasing as they are accurate and safe to use.In this project, an Arduino based digital thermometer is
designed that can be used to monitor the temperature of room.
Circuit Diagram
Hardware
Required
·Arduino
Uno
·LM35
Temperature Sensor
·16X2
LCD Display
Component
Description
LM35
LM35 is a precision centigrade
temperature sensor. The output voltage of the sensor is directly proportional
to the temperature in centigrade. LM35 can be used in the range of -550C to +1500C with +/- 0.750C accuracy.
At room temperature, the accuracy is +/- 0.250C. The output voltage of LM35 changes at 10 mV /0C i.e. for every 10C change in temperature, the output voltage changes at +/- 10 mV. LM35
is a 3 pin IC and the figure depicting the pins is shown below.
A similar precision temperature
sensor is LM34 that can be used to measure temperature in Fahrenheit. It can be
used to get the temperature directly in Fahrenheit.
Circuit Design
of Digital Thermometer
LM35 is the temperature
sensor used in this project. The output of the sensor is directly proportional
to the temperature but in analogue form. Hence, the output of LM35 i.e. pin 2 is connected to
analog input A0 of Arduino.
As it is a digital thermometer,
we need to convert the analogue values
to digital and display the result on a display like LCD. We used a 16X2 LCD in
this project. Pins 1 and 2 of LCD are connected to ground and supply
respectively.
In order to control the
contrast of the display, Pin 3 of LCD is
connected to the wiper of a 10 KΩ POT. The other terminals of POT are connected
to supply and ground. Pins 15 and 16 of LCD are used to turn the backlight of
the LCD.
They are connected to supply
and ground respectively. In order to display the information on LCD, we need 4 data pins of the LCD. Pins 11 – 14
(D4 – D7) are connected to Pins 5 – 2 of Arduino. Pins 4, 5 and 6 (RS, RW and E) of LCD are control pins.
Pins 4 (RS) of LCD is connected
to pin 7 of Arduino. Pin 5 (RW) is connected to ground. Pin 6 (E) is connected
to pin 6 of Arduino.
Working
A high precision digital thermometer
is designed in this project. It is constructed with simple components like
Arduino, LM35 temperature sensor and an
LCD display. The working of the circuit is very simple and is explained below.
The temperature sensor i.e.
LM35 continuously monitors the room temperature and gives an analogue
equivalent voltage which is directly proportional to the temperature.
This analogue data is given to
Arduino through A0. As per the code written, the Arduino converts this analogue voltage
value to digital temperature readings. This value is displayed on the LCD.
The rate of change of
temperature capture can be programmed in the code. The output displayed on the
LCD is an accurate reading of room temperature in centigrade.
https://www.youtube.com/watch?v=0esbiEey0gY
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Arduino
based Digital Thermometer Project using Temperature ...
https://circuitdigest.com/microcontroller-projects/digital-thermometer-using-arduino
Thermometers are useful apparatus being used since
long time for temperature measurement. In this project we have made an Arduino based digital ...
Arduino
Based Digital Thermometer - Electronics Hub
www.electronicshub.org/arduino-based-digital-thermometer/
Feb 1, 2016 -
Thermometer is a temperature measuring instrument.
There are different principles that can be used to measure the temperature like
thermal ...
Circuit
Diagram · Hardware
Required · Component
Description
Making
LCD Thermometer With Arduino and LM35/36 - All
www.instructables.com/id/Electronic-Thermometer-with-Arduino-UNO/
I'm going to
show you how to make an LCD thermometer with an Arduino UNO and a ... Also you can buy them separately from the following stores: Adafruit,
... the temperature based on the reading and send that value back
float voltage ...
Making
LCD Thermometer With Arduino And LM35/36 - Arduino ...
https://www.arduino.cc/.../making-lcd-thermometer-with-arduino-and-lm35-36-c058f...
Nov 18, 2016
- I'm going to show
you how to make an LCD thermometer with an Arduino ... analogRead(pin); // Calculate the temperature based on the reading and ... 5, 4, 3
Arduino
Based Digital Thermometer Thermometer is a temperature ...
https://plus.google.com/103399385049948978136/posts/fVJM26qqJU8
Uzi
DC - 01
Apr 2, 2017 -
Arduino Based Digital
Thermometer Thermometer
is a temperature measuring instrument. There are different principles that can
be used to measure the ...
Digital
thermometer using arduino. Celsius and Fahrenheit scales ...
www.circuitstoday.com/digital-thermometer-using-arduino
Jun 19, 2014
- This article is
about a simple three digit digital
thermometer using arduino. ... Circuit diagram of the digital thermometer using arduino and LM35 is .... medical areas using
microcontroller ,gsm rfid based if the circuits or kits are ...
Arduino
Based Digital Thermometer - YouTube
Jun 16, 2015 - Uploaded by
Circuit Digest
Demonstration
video of arduino based digital
thermometer project
using temperature sensor LM35. Check out ...
digital
thermometer with arduino uno - YouTube
https://www.youtube.com/watch?v=WnNnsFkZLNw
Jan 28, 2015 - Uploaded by
ProjectsDunia
In this
video tutorial you tend to learn how to make a simple digital thermometer with arduino uno using LM35 ...
Arduino
Based Digital Thermometer · GitHub
Code
#include<LiquidCrystal.h>
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LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
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const int Sensor = A0;
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byte degree_symbol[8] =
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{
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0b00111,
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0b00101,
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0b00111,
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0b00000,
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0b00000,
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0b00000,
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0b00000,
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0b00000
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};
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void setup()
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{
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pinMode(Sensor, INPUT);
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lcd.begin(16, 2);
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lcd.createChar(1, degree_symbol);
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lcd.setCursor(0, 0);
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lcd.print(" Digital ");
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lcd.setCursor(0, 1);
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lcd.print(" Thermometer ");
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delay(4000);
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lcd.clear();
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}
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void loop()
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{
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float temp_reading=analogRead(Sensor);
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float temperature=temp_reading*(5.0/1023.0)*100;
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delay(10);
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lcd.clear();
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lcd.setCursor(0, 0);
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lcd.print("Temperature in C");
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lcd.setCursor(4, 1);
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lcd.print(temperature);
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lcd.write(1);
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lcd.print("C");
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delay(1000);
Note
·This
project can be used to monitor temperature of a room with in a range of -550C to +1500C with very accurate
readings.
·The
temperature sensor used (LM35) is a precision centigrade temperature sensor. If
the readings of the temperature are required in Fahrenheit, then either Fahrenheit temperature sensor
(LM34) can be used or simply modify the code for converting Centigrade to
Fahrenheit.
·The
thermometer can be powered by a 9V battery making it a portable device that can
be easily moved between different rooms or locations.
·Can
be used in transportation vehicles to determine the icing conditions of the
road.
·Based
on the readings of the thermometer, the
air conditioning systems, heating and
cooling systems can be controlled either manually or automatically.
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