Arduino LM35 temperature sensor with LCD Display

I added my LM35 Temperature Sensor to my Arduino again and added a display to show how hot it is... ;)

I have used the LM35 already some month ago; It is a very easy to setup device.

Here is my Code (UPADTE 2015.08.21; This is my final code.):

// Written 2015 by Johannes Findeisen <you@hanez.org>  #include <LiquidCrystal.h>  // Initialize the LCD code. Take care of the pins I use. The first two pins // are 12 and 11 in most examples around the web. I use pin 7 and 6 because of // nicer wiring on my breadboard. // Read this for more information: // https://www.arduino.cc/en/Tutorial/LiquidCrystal LiquidCrystal lcd(7, 6, 5, 4, 3, 2);  // Define how many samples should be collected every $collectDelay miliseconds. // After sample collection the temperature is beeing calculated and then // send to the LCD. int samples = 16;  // Collect delay between each sample. int collectDelay = 2000;  // The pin where the status LED is connected to. int ledPin = 13;  // The analog input pin where the LM35 is connected to. int tempPin = 0;  // Just some variable initializations. float tempC = 0; float tempClast = 0; float tempF = 0;  void setup() {   pinMode(ledPin, OUTPUT);   lcd.begin(16, 2);   // Get data for the first time.   // Read this to understand the temperature calculation:   // http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/   tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;   tempClast = tempC;   // Celsius to Fahrenheit conversion   tempF = (tempC * 9) / 5 + 32;   // Refresh the LCD output   lcd_refresh(); }  void loop() {   int i;   tempC = 0;   for(i = 0; i <= (samples - 1); i++) {     tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);     digitalWrite(ledPin, HIGH);     delay((collectDelay / 2));    digitalWrite(ledPin, LOW);     delay((collectDelay / 2));   }   // Calculate temperature   tempC = tempC / (float)samples;   // Celsius to Fahrenheit conversion.   tempF = (tempC * 9) / 5 + 32;   // Print results to the display.   lcd_refresh();   // Remember current temperature for next run.   tempClast = tempC; }  // Prints results to the display void lcd_refresh() {   lcd.setCursor(0, 0);   lcd.print("Temperature");   lcd.print((char)40); // ASCII code 40 = "("   if(tempClast > tempC) {     lcd.print((char)60); // ASCII code 60 = "<"   } else if(tempClast < tempC) {     lcd.print((char)62); // ASCII code 62 = ">"   } else {     lcd.print((char)61); // ASCII code 61 = "="   }   lcd.print((char)41); // ASCII code 41 = ")"   lcd.print((char)58); // ASCII code 58 = ":"   lcd.setCursor(0, 1);   lcd.print(tempC);   lcd.print((char)223); // ASCII code 223 = "°"   lcd.print("C/");   lcd.print(tempF);   lcd.print((char)223); // ASCII code 223 = "°"   lcd.print("F"); }

Some other sources:

Have fun with it... ;)

Permalink: https://hanez.org/2011/12/11/arduino-lm35-temperature-sensor-with-lcd-display/

Arduino LM35 temperature sensor with LCD Display

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