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Author Topic: THERMOMETER (TERMÔMETRO) - Temperature sensor+ LCD 16x2 +leds + max/min  (Read 1714 times)
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TERMOMETRO - PROJETO EM ARDUINO QUE MOSTRA A TEMPERATURA AMBIENTE.

screenshot : http://i.tinyuploads.com/s8UADp.jpg

Características:
-3 leds indicadores de temperatura baixa , alta ou boa
-temperaturas maxima e minima, desde que o arduino foi ligado.
-temperatura em fahrenheit
-registra valores no serial monitor

Componentes utilizados:
-microcontrolador arduino uno
-display LCD, 16x2
-jumpers
-potenciometro 10k
-sensor de temperatura lm35
-leds amarelo, verde e vermelho
-3 resistores 330k para os leds.
----------------------------------------------------------------------------
Project that shows the ambient temperature
Features: -
-3 leds indicating wether temperature is low, high or nice
-max/min temperatures, since arduino is on
-temperatures in fahrenheit
-log values on serial monitor

Components i used:
-arduino uno board
-display LCD 16x2
-jumpers
-potenciometer 10k
-temperature sensor LM35
-yellow,green and red led
-three resistors 330k for the leds
------------------------------------------------------------------------
here is how i set on the breadboard : http://i.tinyuploads.com/OVh6Um.jpg

Code:
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int pinoAnalogico = 3;
int pinoPotenciometro = 0;
long valorPotenciometro = 0;
float tempc = 0, tempf=0; // temperature variables (variaveis de temperatura)
float temperature[8]; // variables to make a better precision (variaveis p/ melhor precisao)
int maxi = -100,mini = 100; // to start max/min temperature (p/ comecar max/min temperatura)
int i;


void setup()
{
  Serial.begin(9600);
  lcd.begin(16, 2); //start the display LCD (inicia o display LCD)
  pinMode(7, OUTPUT); //set pin 7 as output for yellow led (define o pino 7 como saída p/ o led amarelo)
  pinMode(8, OUTPUT); //set pin 8 as output for green led (define o pino 7 como saída p/ o led verde)
  pinMode(9, OUTPUT); //set pin 9 as output for red led (define o pino 9 como saída p/ o led vermelho)
}

void loop()
// gets 8 samples of temperature for better precision (retira oito amostras de temperatura p/ melhor precisao)
{
   for(i = 0;i<=7;i++){
    temperature[i] = ( 5.0 * analogRead(pinoAnalogico) * 100.0) / 1024.0;
    tempc = tempc + temperature[i];
    delay(100);
  }
  temps(); //calls function to define temperatures (chama a funcao para definir as temperaturas)
  // prints values on serial monitor (imprime os valores no serial monitor)
  Serial.print(tempc,DEC);
  Serial.print(" Celsius, ");

  Serial.print(tempf,DEC);
  Serial.print(" fahrenheit -> ");

  Serial.print(maxi,DEC);
  Serial.print(" Max, ");
  Serial.print(mini,DEC);
  Serial.println(" Min");

  tempc = 0;
  delay(1000); // 1s delay for update temperature (1s de atraso para atualizar temperatura.)
}


void temps() {
  tempc = tempc/8.0; // calculates final temperature (calcula temperatura final)
  tempf = (tempc * 9)/ 5 + 32; // converts to fahrenheit (converte para fahrenheit)

  if(tempc > maxi) {maxi = tempc;} // set max temperature (define temperatura maxima)
  if(tempc < mini) {mini = tempc;} // set min temperature (define temperatura minima)
  write_LCD();
  //here you can set high ,med or low temp values as you wish (aqui vc define os valores de temperatura alta media ou baixa)
  if(tempc < 22)
  {
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
    digitalWrite(7, HIGH);   // set the yellow LED on (acende led amarelo)
    lcd.setCursor(0, 0);
    lcd.print("Low"); // prints LOW temperature on lcd (imprime temperatura baixa no lcd)
  }
  if(tempc > 27)
  {
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(9, HIGH);   // set the red LED on (acende led vermelho)
    lcd.setCursor(0, 0);
    lcd.print("High"); // prints HIGH temperature on lcd (imprime temperatura alta no lcd)
  }
  if((tempc >= 22) && (tempc <= 27))
  {
    digitalWrite(7, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, HIGH);   // set the green LED on (acende led verde)
    lcd.setCursor(0, 0);
    lcd.print("Nice"); // prints nice temperature on lcd (imprime temperatura boa no lcd)
  }
}


void write_LCD() // writes on display (escreve no display)
{

  lcd.setCursor(5, 0);
  lcd.print("temperature");
  lcd.setCursor(15, 0);
  lcd.setCursor(0, 1);
  lcd.print(tempc,1); // change tempc for tempf for fahrenheit
  lcd.setCursor(4, 1);
  lcd.print((char)223); //prints degree symbol
  lcd.print("C"); //change to F for fahrenheit
  lcd.setCursor(10, 1);
  lcd.print(maxi);
  lcd.setCursor(12, 1);
   lcd.print("/");
  lcd.print(mini);
  lcd.setCursor(14, 1);
}
« Last Edit: October 15, 2012, 09:07:20 pm by lucast8 » Logged

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