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    public by tomsim modified 13 hours ago  5  0  3  0

    ESP8266 wifi web server setup

    Lambda style Wifi web server with DHT22 data upload to ThingSpeak
    /* DHTServer - ESP8266 Webserver with a DHT sensor as an input
    
       Based on ESP8266Webserver, DHTexample, and BlinkWithoutDelay (thank you)
    
       Version 1.0  5/3/2014  Version 1.0 Mike Barela for Adafruit Industries
    */
    #include <ESP8266WiFi.h>
    #include <WiFiClient.h>
    #include <ESP8266WebServer.h>
    #include <DHT.h>
    #include <TimeLib.h>
    #include "ThingSpeak.h"
    
    #define DHTTYPE DHT22
    
    const int DHTPIN = D4;
    
    const char* ssid     = "mySSID";
    const char* password = "myPassword";
    
    ESP8266WebServer server(80);
    
    /*============ ThingSpeak setup ==================*/
    // Note:  Each channel has its own number and write API key
    // API key is what get used - wrong channel number doesn't matter
    
    // Temperature Humidity Channel
    static unsigned long myChannelNumber = 123456;
    static const char 	*myWriteAPIKey = "AB1CDEF6HIJKLMNO";
    static WiFiClient  client;
    
    /*============ End ThingSpeak setup ==============*/
    
    
    // Initialize DHT sensor 
    // NOTE: For working with a faster than ATmega328p 16 MHz Arduino chip, like an ESP8266,
    // you need to increase the threshold for cycle counts considered a 1 or 0.
    // You can do this by passing a 3rd parameter for this threshold.  It's a bit
    // of fiddling to find the right value, but in general the faster the CPU the
    // higher the value.  The default for a 16mhz AVR is a value of 6.  For an
    // Arduino Due that runs at 84mhz a value of 30 works.
    // This is for the ESP8266 processor on ESP-01 
    DHT dht(DHTPIN, DHTTYPE, 11); // 11 works fine for ESP8266
     
    float lastHumdty, lastTempF;  // Values read from sensor
    static int nextSampleMinute = 15;
    static int minuteSampleInterval = 15;
    
    // Generally, you should use "unsigned long" for variables that hold time
    unsigned long previousMillis = 0;        // will store last temp was read
    const long interval = 2000;              // interval at which to read sensor
    
    void getTemperature() {
      // Wait at least 2 seconds seconds between measurements.
      // if the difference between the current time and last time you read
      // the sensor is bigger than the interval you set, read the sensor
      // Works better than delay for things happening elsewhere also
      unsigned long currentMillis = millis();
     
      if(currentMillis - previousMillis >= interval) {
        // save the last time you read the sensor 
        previousMillis = currentMillis;   
    
        // Reading temperature for humidity takes about 250 milliseconds!
        // Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
        lastHumdty = dht.readHumidity();          // Read humidity (percent)
        lastTempF = dht.readTemperature(true);     // Read temperature as Fahrenheit
        // Check if any reads failed and exit early (to try again).
        if (isnan(lastHumdty) || isnan(lastTempF)) {
          Serial.println("Failed to read from DHT sensor!");
          return;
        }
      }
    }
    
    static int uploadData(void)
    {
    	ThingSpeak.setField( 1, lastTempF);
    	ThingSpeak.setField( 2, lastHumdty);
    	int rc = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
    //	Serial.println(String("Post rc=")+rc);
    	return rc;
    }
    
     
    const String HTML_TYPE = "text/html";
    
    void handle_null() {
        Serial.println("Handle null");
    	server.send(200,HTML_TYPE,"");
    	delay(100);
    }
    void handleRoot()
    {
    	String wstr = 
    	"<p>Hello from the weather esp8266, read from /temp or /humidity"
    	"<br>set <a href=/set?minuteSampleInterval=5>5 minute</a> sample interval"
    	", <a href=/set?nextSampleMinute=15>sample at 15 </a> minute"
    	"<br>Take <a href=/sample>sample Data</a> and upload to ThingSpeak"
    	"<br><a href=/temp>Get Temperature</a>"
    	"<br><a href=/humidity>Get Humidity</a>";
    	wstr += "<br>Last temperature: " + String(lastTempF)+"F";
    	wstr += " humidity: " + String(lastHumdty)+"%";
    	wstr += "<br>Current minute: " + String(minute(now()));
    	wstr += " next sample time: " + String(nextSampleMinute)+" min.";
    	wstr += " sample interval: " + String(minuteSampleInterval)+" min.";
    	server.send(200,HTML_TYPE, wstr);
    	delay(100);
    }
    void doSample()
    {
    	Serial.println("DoSample");
    	getTemperature();
    	int rc = uploadData();
    	String wstr = "<p>Take sample data:  ";
    	wstr += "<br>Temperature " + String(lastTempF);
    	wstr += "<br>Humidity " + String(lastHumdty);
    	wstr += "<br>Upload thingspeak rc=" + String(rc);
    	server.send(200,HTML_TYPE, wstr);
    }
     
    // Web Server Service Definition structure
    // =======================================
    typedef struct s_WebServiceDef
    {
    	const char *urlName;
    	void (*doit)(void);
    } WebServiceDef;
    
    /* =======================================================================
    	Define web service definition here
    	Each entry has a URL name and a lambda function to service the request
       =======================================================================
    */
    static WebServiceDef wsd[] = {
    	{ "/", handleRoot },
    	{ "/favicon", handle_null },
    	{ "/temp",			// url name
    		[] ()				// lambda function
    		{
    			getTemperature();       // read sensor
    			String wstr="Temperature: "+String((int)lastTempF)+" F";
    			server.send(200, "text/plain", wstr);   // send to someones browser when asked
    		}
    	},
    	{ "/humidity", []()
    		{ 
    			getTemperature();
    			String wstr="Humidity: "+String((int)lastHumdty)+"%";
    			server.send(200, "text/plain", wstr);
    		}
    	},
    	{ "/sample", doSample },
    	{ "/set", []()
    		{
    			String n = String("minuteSampleInterval");
    			if (server.hasArg(n))
    			{
    				int v = server.arg(n).toInt();
    				if (v)
    					minuteSampleInterval = v;
    			}
    			n = String("nextSampleMinute");
    			if (server.hasArg(n))
    			{
    				int v = server.arg(n).toInt();
    				if (v)
    					nextSampleMinute = v;
    			}
    			server.send(200, "text/plain", "ok");
    		}
    	},
     	{0,0}
    };
    
    static void setupServerHandler(void)
    {
    	for (int i; wsd[i].urlName; i++)
    	{
    		server.on( wsd[i].urlName, wsd[i].doit);
    	}
    	server.onNotFound(handleRoot);
    }
    
    static int nextAlarmMin(int sampleInterval)
    {
    	int nextMin = minute(now());
    	nextMin = ((nextMin + sampleInterval) % 60);	// alarm every 5 min
    	return nextMin;
    }
    
    
    
    void setup(void)
    {
    	// You can open the Arduino IDE Serial Monitor window to see what the code is doing
    	Serial.begin(115200);  // Serial connection from ESP-01 via 3.3v console cable
    	dht.begin();           // initialize temperature sensor
    
    	// Connect to WiFi network
    	WiFi.begin(ssid, password);
    	Serial.print("\n\r \n\rWorking to connect");
    
    	// Wait for connection
    	while (WiFi.status() != WL_CONNECTED) {
    	delay(500);
    	Serial.print(".");
    	}
    	Serial.println("");
    	Serial.println("DHT Weather Reading Server");
    	Serial.print("Connected to ");
    	Serial.println(ssid);
    	Serial.print("IP address: ");
    	Serial.println(WiFi.localIP());
    
    	ThingSpeak.begin(client);
    
    	setupServerHandler();
    
    	server.begin();
    	Serial.println("HTTP server started");
    }
     
    void loop(void)
    {
    	int currentMinute = minute(now());
    
    	if (currentMinute == nextSampleMinute)
    	{
    		// trigger sample at set interval
    		Serial.println("Regular sample");
    		getTemperature();
    		int rc = uploadData();
    		Serial.println("rc=" + String(rc));
    
    		nextSampleMinute = nextAlarmMin(minuteSampleInterval);
    		delay(1000);
    	}
    
    	server.handleClient();
    } 
    
    

    public by rthurber modified Nov 30, 2017  206  6  3  1

    webex.pl

    C++
    // Enter here the actual content of the snippet.						$a = 1;

    public by rahul4292 modified Nov 8, 2017  122  0  3  2

    Test

    // Enter here the actual content of the snippet.	
    
    checking

    public by rahul4292 modified Nov 8, 2017  92  0  2  0

    cvxvs

    // Enter here the actual content of the snippet.						xcvxv

    public by Tech_JA modified Oct 26, 2017  47  0  2  0

    Qt 5 Dark Fusion Palette

    https://gist.github.com/QuantumCD/6245215
    qApp->setStyle(QStyleFactory::create("Fusion"));
    
        QPalette darkPalette;
        darkPalette.setColor(QPalette::Window, QColor(53,53,53));
        darkPalette.setColor(QPalette::WindowText, Qt::white);
        darkPalette.setColor(QPalette::Base, QColor(25,25,25));
        darkPalette.setColor(QPalette::AlternateBase, QColor(53,53,53));
        darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
        darkPalette.setColor(QPalette::ToolTipText, Qt::white);
        darkPalette.setColor(QPalette::Text, Qt::white);
        darkPalette.setColor(QPalette::Button, QColor(53,53,53));
        darkPalette.setColor(QPalette::ButtonText, Qt::white);
        darkPalette.setColor(QPalette::BrightText, Qt::red);
        darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
    
        darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
        darkPalette.setColor(QPalette::HighlightedText, Qt::black);
        
        qApp->setPalette(darkPalette);
    
        qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");											

    public by hwitk modified Sep 9, 2017  137  0  2  0

    ujj

    C++
    // Enter here the actual content of the snippet.						

    public by RobertKnoester modified Jun 4, 2017  186  1  4  0

    comment_line

    comment_line
    //////////////////////////////////////////////////////////////////

    public by javieralejandroenc20 modified Feb 27, 2017  461  0  4  0

    Untitled

    c++
    // Enter here the actual content of the snippet.            

    public by axydus modified Jan 27, 2017  19955  2  4  0

    C++_SwitchCase(axyd)

    Simple switch...case for menu choice
    int choice= 0;
    cin>>choice;
    
    switch(choice){
    	case 1:
    		
    		break;
    	case 2:
    		
    		break;
    	case 3:
    		
    		break;
    	case 4:
    		
    		break;
    	default :
    		
    		break;		
    }

    public by arijitiit modified Sep 26, 2016  1655  2  4  0

    C++_1

    mACROS
    // Enter here the actual content of the snippet.            
    
    typedef long long ll;
    typedef pair<int, int> ii;
    typedef vector<ii> vii;
    typedef vector<int> vi;
    #define INF 1000000000
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