lmsousa
Published © GPL3+

Temperature and Humidity Logger (Using Arduino)

Reads and stores in SD card, the temperature and humidity values over time.

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Temperature and Humidity Logger (Using Arduino)

Things used in this project

Hardware components

Adafruit Data Logger Shield
SD CARD Writer, RTC, plus a prototyping area
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Adafruit LCD Shield Kit w/ 16x2 Character Display - Only 2 pins used!
This kit uses only 2 arduino pins (SCL and SDA) saving I/O pins for other purposes.
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DHT11 Temperature & Humidity Sensor (4 pins)
DHT11 Temperature & Humidity Sensor (4 pins)
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Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
I used Arduino UNO R3
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Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Medium soldering skills needed

Story

Read more

Schematics

Temperature and humidity Sensor DHT11 connections

The DHT11 is mounted on the prototyping area of the data logger shield. The diagram is the one showed in this picture.

Sensor Diagram

Fritzing Schematic

Sensor Connection Diagram

jpg file, showing how to connect the sensors

Display connections

4 wires is all you need to connect this display

Code

DataLog_V55.ino

Arduino
This is the final code. Uses Temperature and humidity sensor DHT11.
/* Arduino Data Logger Version 2015 by Luis Sousa */

#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <RTClib.h>
#include <dht11.h>
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>

#define ECHO_TO_SERIAL 1 // dados no porto serie?
#define DHT11PIN 2 //pino digital onde liga sensor de temp e humid
#define redLEDpin 4 //pino digital onde liga LED vermelho
#define greenLEDpin 3 //pino digital onde liga LED verde
#define chipSelect 10 //pino digital onde liga CS do SD Card
#define luzP 3 // pino analogico onde liga LDR
#define pausa 5000 //5s
#define ficheiro "dados.txt" //nome do ficheiro de dados
#define cabecalho "millis,Data,Hora,Vin,Luz,Temperatura,Humidade,DewPoint" //cabecalho da informaao a gravar
#define RED 0x1
#define YELLOW 0x3
#define GREEN 0x2
#define TEAL 0x6
#define BLUE 0x4
#define VIOLET 0x5
#define WHITE 0x7

dht11 DHT11; // sensor de temp e humidade
RTC_DS1307 RTC; // Real Time Clock
Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();

// Inicializao de variaveis
float Vin = 0;
byte LCDColor = 1;
//char ficheiro[] = "dados.txt";
int year = 0;
int month = 0;
int day = 0;
int hour = 0;
int minute = 0;
byte buttons = 0;
DateTime now;

//Funoes
void erro(char *str)
{
  //Sinaliza erro no lcd
  lcd.clear();
  lcd.setBacklight(RED);
  lcd.setCursor(0, 0);
  //lcd.print("Erro ");
  lcd.setCursor(0, 1);
  lcd.print(str);

  //Sinaliza erro no porto serie
  Serial.print("Erro: ");
  Serial.println(str);
  // red LED = erro
  digitalWrite(redLEDpin, HIGH);
  while (1); // HALT
}
int RtcAdj(char *str, int valor)
{
  byte sair = 0;
  byte debounce = 80;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Acertar Relogio ");

  while (!sair)
  {
    lcd.setCursor(0, 1);
    lcd.print (str);
    lcd.print(valor);
    buttons = lcd.readButtons();
    if (buttons)
    {
      if (buttons & BUTTON_UP)
      {
        valor ++;
        delay(debounce);
      }
      if (buttons & BUTTON_DOWN)
      {
        valor --;
        delay(debounce);
      }
      if (buttons & BUTTON_LEFT)
      {
        valor --;
        delay(debounce);
      }
      if (buttons & BUTTON_RIGHT)
      {
        valor ++;
        delay(debounce);
      }
      if (buttons & BUTTON_SELECT)
      {
        sair = 1;
      }
    }
  }
  return (valor);
}
/*
//Celsius para Fahrenheit
double Fahrenheit(double celsius)
{
  return 1.8 * celsius + 32;
}

//Celsius para Kelvin
double Kelvin(double celsius)
{
  return celsius + 273.15;
}
*/
// dewPoint function NOAA
// reference: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
  double A0 = 373.15 / (273.15 + celsius);
  double SUM = -7.90298 * (A0 - 1);
  SUM += 5.02808 * log10(A0);
  SUM += -1.3816e-7 * (pow(10, (11.344 * (1 - 1 / A0))) - 1) ;
  SUM += 8.1328e-3 * (pow(10, (-3.49149 * (A0 - 1))) - 1) ;
  SUM += log10(1013.246);
  double VP = pow(10, SUM - 3) * humidity;
  double T = log(VP / 0.61078); // temp var
  return (241.88 * T) / (17.558 - T);
}
/*
// delta max = 0.6544 wrt dewPoint()
// 5x faster than dewPoint()
// reference: http://en.wikipedia.org/wiki/Dew_point
double dewPointFast(double celsius, double humidity)
{
  double a = 17.271;
  double b = 237.7;
  double temp = (a * celsius) / (b + celsius) + log(humidity / 100);
  double Td = (b * temp) / (a - temp);
  return Td;
}
*/
void setup()
{
  pinMode(10, OUTPUT);  // SD ChipSelect
  pinMode(13, OUTPUT);  // LED de monitorizaao
  pinMode(redLEDpin, OUTPUT);
  pinMode(greenLEDpin, OUTPUT);

  // Inicializaao do porto serie:
  Serial.begin(9600);

  //Inicializaao do I2C
  Wire.begin();

  //Inicializao do LCD
  lcd.begin(16, 2);
  lcd.setBacklight(TEAL);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Data Logger V5.5");
  lcd.setCursor(0, 1);
  lcd.print("Luis Sousa-2015");
  delay(900);
  lcd.clear();

  //Inicializaao do sensor de temperatura
  Serial.print("DHT11 LIBRARY VERSION: ");
  Serial.println(DHT11LIB_VERSION);
  Serial.println();
  int chk = DHT11.read(DHT11PIN);
  Serial.print("Sensor de Temperatura: ");
  switch (chk)
  {
    case 0: Serial.println("OK"); break;
    case -1: erro("DHT11 Checksum"); break;
    case -2: erro("DHT11 Time out"); break;
    default: erro("DHT11 Error"); break;
  }
  Serial.println();

  //Inicializao do SD Card
  if (!SD.begin(chipSelect)) // Verifica Presena do SD Card:
  {
    erro("Introduza SD");
    /*
    Serial.println("Introduza Cartao SD");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Introduza ");
    lcd.setCursor(0, 1);
    lcd.print("Cartao SD");
    // Sai por falta de Cartao
    return;
    */
  }
  else Serial.println("Cartao SD OK.");

  // cria novo ficheiro
  //char filename[] = "LOGDAT00.CSV";
  //for (uint8_t i = 0; i < 100; i++)
  //{
  // filename[6] = i / 10 + '0';
  // filename[7] = i % 10 + '0';
  //  if (! SD.exists(filename))
  //  {
  //    // se nao existir, cria novo
  File logfile = SD.open(ficheiro, FILE_WRITE);
  //    break; // sai do loop!
  //  }
  //}
  if (! logfile)
  {
    erro("Erro no ficheiro");
  }
  else
  {
    Serial.print("Gravando em: ");
    Serial.println(ficheiro);
    logfile.println(cabecalho);
    logfile.close();
  }
#if ECHO_TO_SERIAL
  Serial.println(cabecalho);
#endif //ECHO_TO_SERIAL

  //Inicializao do RTC
  if (!RTC.begin())
  {
    // logfile.println("RTC com avaria");
    // Serial.println("RTC com avaria");
    erro("RTC com avaria");
  }
  if (! RTC.isrunning())
  {
    Serial.println("RTC parado");
    // linha seguinte acerta RTC para data/hora da compilaao
    RTC.adjust(DateTime(F(__DATE__), F(__TIME__)));
    Serial.println("RTC ajustado");
    // para ajustar para uma determinada data/hora por ex:
    // 21 de Janeiro de 2014 as 03h escreveria:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
}

void loop()
{
  digitalWrite(greenLEDpin, HIGH); // Inicia Escrita

  Vin = (55.00 * analogRead(0) / 1024);
  int chk = DHT11.read(DHT11PIN);
  float humid = DHT11.humidity;
  float tempC = DHT11.temperature;
  tempC = tempC - 2;  // Correco apos calibrao
  //float tempK = Kelvin(tempC);
  //float tempF = Fahrenheit(tempC);
  float dewP = dewPoint(tempC, humid);
  int luzV = analogRead(luzP);
  /*
    if (Vin < 7.50) lcd.setBacklight(0); //modo poupana de energia
    else lcd.setBacklight(TEAL);
  */
  DateTime now;
  now = RTC.now();
  uint32_t m = millis();

  //display data
  lcd.setCursor(0, 0);
  lcd.print(now.day(), DEC);
  lcd.print("/");
  lcd.print(now.month(), DEC);
  lcd.print("/");
  lcd.print(now.year(), DEC);
  lcd.print(" ");
  lcd.print(now.hour(), DEC);
  lcd.print(":");
  lcd.print(now.minute(), DEC);
  lcd.print("  ");
  lcd.setCursor(0, 1);
  lcd.print("T:");
  lcd.print(tempC, 0);
  lcd.print("C H:");
  lcd.print(humid, 0);
  lcd.print("% ");
  lcd.print("D:");
  lcd.print(dewP, 0);
  lcd.print("  ");

  // log data
  File logfile = SD.open(ficheiro, FILE_WRITE);
  if (logfile)
  {
    logfile.print(m); // millisegundos desde o inicio
    logfile.print(",");
    logfile.print(now.day(), DEC);
    logfile.print("/");
    logfile.print(now.month(), DEC);
    logfile.print("/");
    logfile.print(now.year(), DEC);
    logfile.print(",");
    logfile.print(now.hour(), DEC);
    logfile.print(":");
    logfile.print(now.minute(), DEC);
    logfile.print(":");
    logfile.print(now.second(), DEC);
    logfile.print(",");
    logfile.print(Vin, 2);
    logfile.print(",");
    logfile.print(luzV);
    logfile.print(",");
    logfile.print(tempC, 0);
    logfile.print(",");
    logfile.print(humid, 0);
    logfile.print(",");
    logfile.println(dewP, 0);
    logfile.close();
  }
  else
  {
    erro("Erro no ficheiro");
  }
#if ECHO_TO_SERIAL
  Serial.print(m); // millisegundos desde o inicio
  Serial.print(",");
  Serial.print(now.day(), DEC);
  Serial.print("/");
  Serial.print(now.month(), DEC);
  Serial.print("/");
  Serial.print(now.year(), DEC);
  Serial.print(",");
  Serial.print(now.hour(), DEC);
  Serial.print(":");
  Serial.print(now.minute(), DEC);
  Serial.print(":");
  Serial.print(now.second(), DEC);
  Serial.print(",");
  Serial.print(Vin, 2);
  Serial.print(",");
  Serial.print(luzV);
  Serial.print(",");
  Serial.print(tempC, 0);
  Serial.print(",");
  Serial.print(humid, 0);
  Serial.print(",");
  Serial.println(dewP, 0);
#endif //ECHO_TO_SERIAL

  digitalWrite(greenLEDpin, LOW); // acabou escrita

  //Teste aos butoes do LCD
  for (byte i = 0; i < 20; i++)
  {
    delay(pausa / 20);
    buttons = lcd.readButtons();
    if (buttons)
    {
      if (buttons & BUTTON_UP)
      {
        lcd.setCursor(0, 1);
        lcd.print("Vin: ");
        lcd.print(Vin, 2);
        lcd.print("V      ");
      }
      if (buttons & BUTTON_DOWN)
      {
        lcd.setCursor(0, 1);
        lcd.print("Luz: ");
        lcd.print(luzV);
        lcd.print("        ");
        delay(500); //debounce
        buttons = lcd.readButtons();
        if (buttons & BUTTON_DOWN)
        {
          now = RTC.now();
          year = now.year();
          month = now.month();
          day = now.day();
          hour = now.hour();
          minute = now.minute();
          year = RtcAdj("Ano: ", year);
          month = RtcAdj("Mes: ", month);
          day = RtcAdj("Dia: ", day);
          hour = RtcAdj("Hora: ", hour);
          minute = RtcAdj("Minutos: ", minute);
          RTC.adjust(DateTime(year, month, day, hour, minute, 0));
          lcd.setCursor(0, 1);
          char msg[] = "RTC Ajustado    ";
          lcd.print(msg);
          logfile.println(msg);
          Serial.println(msg);
        }
      }
      if (buttons & BUTTON_LEFT)
      {
        LCDColor = LCDColor - 1;
        if (LCDColor < 1) LCDColor = 1;
        lcd.setBacklight(LCDColor);
      }
      if (buttons & BUTTON_RIGHT)
      {
        LCDColor = LCDColor + 1;
        if (LCDColor > 7) LCDColor = 7;
        lcd.setBacklight(LCDColor);
      }
      if (buttons & BUTTON_SELECT)
      {
        if (LCDColor  > 0)LCDColor = 0;
        else LCDColor = (TEAL);
        lcd.setBacklight(LCDColor);
      }
    }
  }
}

Credits

lmsousa

lmsousa

5 projects • 18 followers

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