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Topic: Temp. and hum. sensor project with LCD readout, logger and alarm - 3 versions (Read 2 times) previous topic - next topic

robtillaart

The new cache module of the forum had some hick-ups. Saw a "reboot" request recently.
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

maroelawerner

Due to attachment problems I include the rest of the code for the i2c interface here.

//*******************************************************



Code for 1604 with i2c interface
Code: [Select]

//*******************************************************


// Temperature and Humidity display and logger
// Code is patched and modified from various sources (Thank you original contributors)

/*

I made this instrument to keep the humidity in my house in check. Started off with just a sensor and display.
This was ignored most the time and therefore a buzzer was added. This starts giving a short beep as the humidity exceeds the "hla".
The more it exceeds it the longer and more frequent the beeps become. When the humidity reaches "hha" it beeps continuously.
For record purposes a SD card logs the temperatures and humidity.

This project started off on an Arduino Duemilanove 328 and then transferred to a strip-board.

I used Arduino IDE 1.0.1

Feel free to contact me for any suggestions and questions.
maroelawerner@gmail.com

*/

#include <SD.h>      // needed for SD card
const int chipSelect = 4;
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>     // needed for LCD 16x2 display

#define I2C_ADDR    0x27  // Define I2C Address where the PCF8574A is
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7


LiquidCrystal_I2C       lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);


int beep = 10;        // pin for piezo buzzer
int hd = 0;           // initialize beep delay
int ds = 0;           // initialize beep interval
int hum = 0;          // initialize humidity
int hla = 70;         // High humidity Low level Alarm
int hha = 20;         // High humidity High level Alarm

File root;

// initialize the library with the numbers of the interface pins
//LiquidCrystal lcd(9, 8, 6 , 5, 3, 2);      // connect rs -> pin 9, enable -> pin 8, d4 -> pin 6, d5 -> pin 5, d6 -> pin 3, d7 -> pin 2

#include "DHT.h"

#define DHTPIN 7     // pin for data from DHT

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

void setup() {
 
 {
 lcd.begin (16,2,LCD_5x8DOTS);


 lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE); // init the backlight
lcd.setBacklight(HIGH);     // Backlight on
}
 
 
 pinMode(beep, OUTPUT);        // define pin as output
 
 if (!SD.begin(chipSelect)) {
   // don't do anything more:
   return;
 }

lcd.print("card initialized.");
delay(3000);
 
 lcd.println("DHTxx test!");
 lcd.clear();
 lcd.print("Home Weather");
 lcd.setCursor(0, 1);
 lcd.print("display");
 
 delay(2000);

 dht.begin();
}

void loop() {
 // Reading temperature or humidity takes about 250 milliseconds!
 // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
 float h = dht.readHumidity();
 float t = dht.readTemperature();

 // check if returns are valid, if they are NaN (not a number) then something went wrong!
 if (isnan(t) || isnan(h)) {
   lcd.println("Failed to read from DHT");      // display error message if no data from sensor is available
 } else {
   lcd.setBacklight(HIGH);     // Backlight on
   lcd.home();
   lcd.print("Hum: ");
   lcd.print(h);
   lcd.print(" %");
   lcd.setCursor(0, 1);
   lcd.print("Temp: ");
   lcd.print(t);
   lcd.print(" *C  ");
   
    int sensor = h;
   String dataString = "";
   dataString += String(sensor);
   dataString += ",";
   sensor = t;
   dataString += String(sensor);
   
 // open the file. note that only one file can be open at a time,
 // so you have to close this one before opening another.
 File dataFile = SD.open("datalog.txt", FILE_WRITE);

 // if the file is available, write to it:
     if (dataFile) {
   dataFile.println(dataString);
   dataFile.close();
       }  
 if (h > hla);{            // calculate duration and interval of beep
   hum = h;
   hd = hum - hla;         // duration of beep
   ds = hha - hd;           // interval of beep
   ds = ds * 10;
 digitalWrite(beep, HIGH);  // turn the Buzzer on
for (int x = 0; x <= hd; x++) {      
delay(100);
       }
Serial.println();
 digitalWrite(beep, LOW);    // turn the Buzzer off
for (int y = 0; y <= ds; y++) {
delay(100);
     }
   }
 }
}


//***************************************************



Code for i2c 2004 interface

Code: [Select]


//***************************************************

// Temperature and Humidity display and logger
// Code is patched and modified from various sources (Thank you original contributors)

/*

I made this instrument to keep the humidity in my house in check. Started off with just a sensor and display.
This was ignored most the time and therefore a buzzer was added. This starts giving a short beep as the humidity exceeds the "hla".
The more it exceeds it the longer and more frequent the beeps become. When the humidity reaches "hha" it beeps continuously.
For record purposes a SD card logs the temperatures and humidity.

This project started off on an Arduino Duemilanove 328 and then transferred to a strip-board.

I used Arduino IDE 1.0.1

Feel free to contact me for any suggestions and questions.
maroelawerner@gmail.com

*/

#include <SD.h>      // needed for SD card
const int chipSelect = 4;
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>     // needed for LCD 16x2 display

#define I2C_ADDR    0x27  // Define I2C Address where the PCF8574A is
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7


LiquidCrystal_I2C       lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);


int beep = 10;        // pin for piezo buzzer
int hd = 0;           // initialize beep delay
int ds = 0;           // initialize beep interval
int hum = 0;          // initialize humidity
int hla = 70;         // High humidity Low level Alarm
int hha = 20;         // High humidity High level Alarm

File root;

// initialize the library with the numbers of the interface pins
//LiquidCrystal lcd(9, 8, 6 , 5, 3, 2);      // connect rs -> pin 9, enable -> pin 8, d4 -> pin 6, d5 -> pin 5, d6 -> pin 3, d7 -> pin 2

#include "DHT.h"

#define DHTPIN 7     // pin for data from DHT

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

void setup() {
 
 {
 lcd.begin (16,2,LCD_5x8DOTS);


 lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE); // init the backlight
lcd.setBacklight(HIGH);     // Backlight on
}
 
 
 pinMode(beep, OUTPUT);        // define pin as output
 
 if (!SD.begin(chipSelect)) {
   // don't do anything more:
   return;
 }

lcd.print("card initialized.");
delay(3000);
 
 lcd.println("DHTxx test!");
 lcd.clear();
 lcd.print("Home Weather");
 lcd.setCursor(0, 1);
 lcd.print("display");
 
 delay(2000);

 dht.begin();
}

void loop() {
 // Reading temperature or humidity takes about 250 milliseconds!
 // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
 float h = dht.readHumidity();
 float t = dht.readTemperature();

 // check if returns are valid, if they are NaN (not a number) then something went wrong!
 if (isnan(t) || isnan(h)) {
   lcd.println("Failed to read from DHT");      // display error message if no data from sensor is available
 } else {
   lcd.setBacklight(HIGH);     // Backlight on
   lcd.home();
   lcd.print("Hum: ");
   lcd.print(h);
   lcd.print(" %");
   lcd.setCursor(0, 1);
   lcd.print("Temp: ");
   lcd.print(t);
   lcd.print(" *C  ");
   
    int sensor = h;
   String dataString = "";
   dataString += String(sensor);
   dataString += ",";
   sensor = t;
   dataString += String(sensor);
   
 // open the file. note that only one file can be open at a time,
 // so you have to close this one before opening another.
 File dataFile = SD.open("datalog.txt", FILE_WRITE);

 // if the file is available, write to it:
     if (dataFile) {
   dataFile.println(dataString);
   dataFile.close();
       }  
 if (h > hla);{            // calculate duration and interval of beep
   hum = h;
   hd = hum - hla;         // duration of beep
   ds = hha - hd;           // interval of beep
   ds = ds * 10;
 digitalWrite(beep, HIGH);  // turn the Buzzer on
for (int x = 0; x <= hd; x++) {      
delay(100);
       }
Serial.println();
 digitalWrite(beep, LOW);    // turn the Buzzer off
for (int y = 0; y <= ds; y++) {
delay(100);
     }
   }
 }
}


//*********************************************

terryking228

HJi,
Here's my Temperature/Humidity Arduino system displaying on the web:
https://ksduino.org/?devices&device_id=3322

Click on a Parameter Name to see a graph of history data.

I'm working on good examples of doing this stuff with the developer of the KSduino site. I've just started on it, but there is a code example here:
http://arduino-info.wikispaces.com/ksduino-tests1
Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

maroelawerner

Hi,

Looks very interesting. I also have an Arduino hooked up to my router, allowing me to access the conditions at home on my smartphone. It is just very plain and functional. I try to keep my power consumption down and also reduce the amount of data transferred to my smartphone.

But what you are doing could be very useful for some of our customers at work. I work in the Refrigeration and Air Conditioning industry and commercial systems that do that kind of thing are very expensive for smaller companies. This could be a cost effective alternative.

robtillaart

@maroelawerner
Please modify your post with the code, to apply code tags. For this use the # button just above the smileys. '(select only the code part and press # button thats all.)
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

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