สอนใช้งาน NodeMCU ESP8266 เชื่อมต่อ DHT11

เซ็นเซอร์วัดอุณหภูมิและความชื้น แสดงค่าผ่าน wifi web server

/*********
	Rui Santos
	Complete project details at http://randomnerdtutorials.com
	*********/

	// Including the ESP8266 WiFi library
	#include <ESP8266WiFi.h>
	#include "DHT.h"

	// Uncomment one of the lines below for whatever DHT sensor type you're using!
	#define DHTTYPE DHT11 // DHT 11
	//#define DHTTYPE DHT21 // DHT 21 (AM2301)
	//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321

	// Replace with your network details
	const char* ssid = "my_arduino";
	const char* password = "0927566556";

	// Web Server on port 80
	WiFiServer server(80);

	// DHT Sensor
	const int DHTPin = 5;
	// Initialize DHT sensor.
	DHT dht(DHTPin, DHTTYPE);

	// Temporary variables
	static char celsiusTemp[7];
	static char fahrenheitTemp[7];
	static char humidityTemp[7];

	// only runs once on boot
	void setup() {
	// Initializing serial port for debugging purposes
	Serial.begin(115200);
	delay(10);

	dht.begin();

	// Connecting to WiFi network
	Serial.println();
	Serial.print("Connecting to ");
	Serial.println(ssid);

	WiFi.begin(ssid, password);

	while (WiFi.status() != WL_CONNECTED) {
	delay(500);
	Serial.print(".");
	}
	Serial.println("");
	Serial.println("WiFi connected");

	// Starting the web server
	server.begin();
	Serial.println("Web server running. Waiting for the ESP IP...");
	delay(10000);

	// Printing the ESP IP address
	Serial.println(WiFi.localIP());
	}

	// runs over and over again
	void loop() {
	// Listenning for new clients
	WiFiClient client = server.available();

	if (client) {
	Serial.println("New client");
	// bolean to locate when the http request ends
	boolean blank_line = true;
	while (client.connected()) {
	if (client.available()) {
	char c = client.read();

	if (c == '\n' && blank_line) {
	// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
	float h = dht.readHumidity();
	// Read temperature as Celsius (the default)
	float t = dht.readTemperature();
	// Read temperature as Fahrenheit (isFahrenheit = true)
	float f = dht.readTemperature(true);
	// Check if any reads failed and exit early (to try again).
	if (isnan(h) \|\| isnan(t) \|\| isnan(f)) {
	Serial.println("Failed to read from DHT sensor!");
	strcpy(celsiusTemp, "Failed");
	strcpy(fahrenheitTemp, "Failed");
	strcpy(humidityTemp, "Failed");
	}
	else {
	// Computes temperature values in Celsius + Fahrenheit and Humidity
	float hic = dht.computeHeatIndex(t, h, false);
	dtostrf(hic, 6, 2, celsiusTemp);
	float hif = dht.computeHeatIndex(f, h);
	dtostrf(hif, 6, 2, fahrenheitTemp);
	dtostrf(h, 6, 2, humidityTemp);
	// You can delete the following Serial.print's, it's just for debugging purposes
	Serial.print("Humidity: ");
	Serial.print(h);
	Serial.print(" %\t Temperature: ");
	Serial.print(t);
	Serial.print(" *C ");
	Serial.print(f);
	Serial.print(" *F\t Heat index: ");
	Serial.print(hic);
	Serial.print(" *C ");
	Serial.print(hif);
	Serial.print(" *F");
	Serial.print("Humidity: ");
	Serial.print(h);
	Serial.print(" %\t Temperature: ");
	Serial.print(t);
	Serial.print(" *C ");
	Serial.print(f);
	Serial.print(" *F\t Heat index: ");
	Serial.print(hic);
	Serial.print(" *C ");
	Serial.print(hif);
	Serial.println(" *F");
	}
	client.println("HTTP/1.1 200 OK");
	client.println("Content-Type: text/html");
	client.println("Connection: close");
	client.println();
	// your actual web page that displays temperature and humidity
	client.println("<!DOCTYPE HTML>");
	client.println("<html>");
	client.println("<head></head><body><h1>ESP8266 - Temperature and Humidity Myarduino.net</h1><h3>Temperature in Celsius: ");
	client.println(celsiusTemp);
	client.println("*C</h3><h3>Temperature in Fahrenheit: ");
	client.println(fahrenheitTemp);
	client.println("*F</h3><h3>Humidity: ");
	client.println(humidityTemp);
	client.println("%</h3><h3>");
	client.println("</body></html>");
	break;
	}
	if (c == '\n') {
	// when starts reading a new line
	blank_line = true;
	}
	else if (c != '\r') {
	// when finds a character on the current line
	blank_line = false;
	}
	}
	}
	// closing the client connection
	delay(1);
	client.stop();
	Serial.println("Client disconnected.");
	}
	} อ้างอิง https://www.myarduino.net

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วันเสาร์ที่ 23 กุมภาพันธ์ พ.ศ. 2562

ทฤษฎี สป.12

สอนใช้งาน NodeMCU ESP8266 เชื่อมต่อ DHT11

เซ็นเซอร์วัดอุณหภูมิและความชื้น แสดงค่าผ่าน wifi web server

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