Mini proiect (7) - Masurarea temperaturii si umiditatii folosind senzorul DHT11

Masurarea temperaturii si umiditatii folosind senzorul DHT11

 Pentru a măsura temperatura si umiditatea cel mai simplu de folosit este senzorul DHT11. Conectarea lui este simpla si rezultatul măsurătorii este de încredere. În plus libraria idDHT11 returneaza temperatura in toate unitatile de măsura a temperaturii Celsius, Kelvin si Fahrenheit. 

Conectarea senzorului DHT11

În imaginea de mai jos se poate observa conectarea senzorului la Atmega2560, Pin 1 DHT11 la 5V, Pin 2 DHT11 la Pinul 2 Arduino, Pin 3 DHT11 e neconectat si Pin 4 DHT11 se conecteaza la GND. Între pinul 1 și 2 am conectat o rezistentă de 10K:

Documentatie proiect

 

• DHT11-Technical-Data-Sheet
• How-to-set-up-the-dht11-humidity-sensor-on-an-arduino

Componente

• Senzor de temperatura si umiditate 
• Placa Atmega2560

Schema electronica/sistem

Afisarea umiditatii si temperaturii pe serial

Cod de test:

	/*
	Florin Simedru
	Complete project details at https://automatic-house.blogspot.com
	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files.
	The above copyright notice and this permission notice shall be included in all
	copies or substantial portions of the Software.
	*/
	/*
	Board int.0 int.1 int.2 int.3 int.4 int.5
	Uno, Ethernet 2 3
	Mega2560 2 3 21 20 19 18
	Leonardo 3 2 0 1
	Due (any pin, more info http://arduino.cc/en/Reference/AttachInterrupt)
	This example, as difference to the other, make use of the new method acquireAndWait()
	*/
	#include "idDHT11.h"
	int idDHT11pin = 2; //Digital pin for comunications
	int idDHT11intNumber = 0; //interrupt number (must be the one that use the previus defined pin (see table above)
	//declaration
	void dht11_wrapper(); // must be declared before the lib initialization
	// Lib instantiate
	idDHT11 DHT11(idDHT11pin,idDHT11intNumber,dht11_wrapper);
	void setup()
	{
	Serial.begin(9600);
	Serial.println("idDHT11 Example program");
	Serial.print("LIB version: ");
	Serial.println(IDDHT11LIB_VERSION);
	Serial.println("---------------");
	}
	// This wrapper is in charge of calling
	// mus be defined like this for the lib work
	void dht11_wrapper() {
	DHT11.isrCallback();
	}
	void loop()
	{
	Serial.print("\nRetrieving information from sensor: ");
	Serial.print("Read sensor: ");
	//delay(100);
	int result = DHT11.acquireAndWait();
	switch (result)
	{
	case IDDHTLIB_OK:
	Serial.println("OK");
	break;
	case IDDHTLIB_ERROR_CHECKSUM:
	Serial.println("Error\n\r\tChecksum error");
	break;
	case IDDHTLIB_ERROR_ISR_TIMEOUT:
	Serial.println("Error\n\r\tISR time out error");
	break;
	case IDDHTLIB_ERROR_RESPONSE_TIMEOUT:
	Serial.println("Error\n\r\tResponse time out error");
	break;
	case IDDHTLIB_ERROR_DATA_TIMEOUT:
	Serial.println("Error\n\r\tData time out error");
	break;
	case IDDHTLIB_ERROR_ACQUIRING:
	Serial.println("Error\n\r\tAcquiring");
	break;
	case IDDHTLIB_ERROR_DELTA:
	Serial.println("Error\n\r\tDelta time to small");
	break;
	case IDDHTLIB_ERROR_NOTSTARTED:
	Serial.println("Error\n\r\tNot started");
	break;
	default:
	Serial.println("Unknown error");
	break;
	}
	Serial.print("Humidity (%): ");
	Serial.println(DHT11.getHumidity(), 2);
	Serial.print("Temperature (oC): ");
	Serial.println(DHT11.getCelsius(), 2);
	Serial.print("Temperature (oF): ");
	Serial.println(DHT11.getFahrenheit(), 2);
	Serial.print("Temperature (K): ");
	Serial.println(DHT11.getKelvin(), 2);
	Serial.print("Dew Point (oC): ");
	Serial.println(DHT11.getDewPoint());
	Serial.print("Dew Point Slow (oC): ");
	Serial.println(DHT11.getDewPointSlow());
	delay(1000);
	}

view raw DHT11_read.ino hosted with ❤ by GitHub

 

Codul l-am preluat de aici . 

O zi bună tuturor !