Other Arduino Codes and Videos by Robojax
This video shows how to use LM35 Temperature Sensor to measure temperature using Arduino. We will display temperature in Celsius, Fahrenheit and Kelvin.
/*
* This Arduin sketch is to use LM35 to measure temperature
* This code has two way to get temperature
* 1-To print the temperatuere either in C, F or K on the serial monitor
* 2-To return the value in C, F and K
*
* Watch Video instrution for this code:https://youtu.be/S5IBc_epa1A
*
* Full explanation of this code and wiring diagram is available at
* my Arduino Course at Udemy.com here: http://robojax.com/L/?id=62
* Written by Ahmad Shamshiri on May 08, 2020 at 02:45 in Ajax, Ontario, Canada
* in Ajax, Ontario, Canada. www.robojax.com
*
* Get this code and other Arduino codes from Robojax.com
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* * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.*
* This code has been download from Robojax.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
const int inPin =A0;//can change
const int iteration = 1000; //can change (see video)
const float LM35_FACTOR =0.01;// do not change
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
Serial.println("Robojax LM35 for Arduino");
delay(500);
}
// the loop routine runs over and over again forever:
void loop() {
//robojax.com LM35 Code for Arduino
printTemperature('C');
Serial.println();
printTemperature('F');
Serial.println();
printTemperature('K');
Serial.println();
Serial.println();
// Serial.print(" Temperature: ");
// printDegree();
// Serial.print(getTemperature('C'));
if(getTemperature('C') >87)
{
// do somethig here (watch video)
}
// Serial.println();
delay(1000);
}
/*
* getTemperature()
* @brief gets the average temperature
* @param average temperature
* @param "type" is character
* C = Celsius
* K = Keliven
* F = Fahrenheit
* @return returns one of the values above
* Written by Ahmad Shamshiri for robojax.com
* on May 08, 2020 at 02:36 in Ajax, Ontario, Canada
*/
float getTemperature(char type)
{
float value;
float averageTemperature =0;
int sensorValue = analogRead(inPin);
float voltage = sensorValue * (5.0 / 1023.0);
float temperature = voltage / LM35_FACTOR;
for(int i=0; i< iteration; i++)
{
averageTemperature += temperature;
}
averageTemperature /=iteration;
if(type =='F')
{
value = averageTemperature *9/5 + 32;//convert to Fahrenheit
}else if(type =='K')
{
value = averageTemperature + 273.15;//convert to Kelvin
}else{
value = averageTemperature;// return Celsius
}
return value ;
}//getTemperature()
/*
* printTemperature()
* @brief prints temperature on serial monitor
* @param charact type
* @param "type" is character
* C = Celsius
* K = Keliven
* F = Fahrenheit
* @return none
* Written by Ahmad Shamshiri for robojax.com
* on May 08, 2020 at 02:45 in Ajax, Ontario, Canada
*/
void printTemperature(char type)
{
float value;
float temp = getTemperature(type);
Serial.print(temp);
printDegree();
if(type =='F')
{
Serial.print("F");
}else if(type =='K')
{
Serial.print("K");
}else{
Serial.print("C");
}
}//printTemperature()
/*
* @brief prints degree symbol on serial monitor
* @param none
* @return returns nothing
* Written by Ahmad Shamshiri on July 13, 2019
* for Robojax Tutorial Robojax.com
*/
void printDegree()
{
Serial.print("\xC2");
Serial.print("\xB0");
}
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