knx/examples/knx-demo/knx-demo.ino

#include <knx.h>

#ifdef ARDUINO_ARCH_ESP8266
#include <WiFiManager.h>
#endif

// create named references for easy access to group objects
#define goCurrent knx.getGroupObject(1)
#define goMax knx.getGroupObject(2)
#define goMin knx.getGroupObject(3)
#define goReset knx.getGroupObject(4)

float currentValue = 0;
float maxValue = 0;
float minValue = RAND_MAX;
long lastsend = 0;

void measureTemp()
{
      
    long now = millis();
    if ((now - lastsend) < 2000)
        return;

    lastsend = now;
    int r = rand();
    currentValue = (r * 1.0) / (RAND_MAX * 1.0);
    currentValue *= 100 * 100;

    // write new value to groupobject
    goCurrent.objectWriteFloatDpt9(currentValue);

    if (currentValue > maxValue)
    {
        maxValue = currentValue;
        goMax.objectWriteFloatDpt9(maxValue);
    }

    if (currentValue < minValue)
    {
        minValue = currentValue;
        goMin.objectWriteFloatDpt9(minValue);
    }
}

// callback from reset-GO
void resetCallback(GroupObject& go)
{
    if (go.objectReadBool())
    {
        maxValue = 0;
        minValue = 10000;
    }
}

void setup()
{
    SerialDBG.begin(115200);

    randomSeed(millis());
	
    #ifdef ARDUINO_ARCH_ESP8266
    WiFiManager wifiManager;    
    wifiManager.autoConnect("knx-demo");
    #endif

    // read adress table, association table, groupobject table and parameters from eeprom
    knx.readMemory();

    // print values of parameters if device is already configured
    if (knx.configured())
    {
        // register callback for reset GO
        goReset.callback(resetCallback);
        
        SerialDBG.print("Timeout: "); SerialDBG.println(knx.paramByte(0));
        SerialDBG.print("Zykl. senden: "); SerialDBG.println(knx.paramByte(1));
        SerialDBG.print("Min/Max senden: "); SerialDBG.println(knx.paramByte(2));
        SerialDBG.print("Aenderung senden: "); SerialDBG.println(knx.paramByte(3));
        SerialDBG.print("Abgleich: "); SerialDBG.println(knx.paramByte(4));
    }
	
    #ifdef ARDUINO_ARCH_ESP8266
    // GPIO (?) of the ESP8266, in which case this is determined by the board selection
    knx.ledPin(LED_BUILTIN);
    // GPIO (?) of the ESP8266, the value depends on the circuit used on the board of the led
    //                          if "0" or "low" then the output switches to gnd, at "1" or "high" the output switches to vcc
    //                          if the next line is commented out then the default is: output switches to gnd
    //knx.ledPinActiveOn(HIGH);
    // GPIO (14) of the ESP8266, in which case it is the connector pin D5 on WeMos D1 R2
    knx.buttonPin(14);
    #endif

    // start the framework. Will get wifi first.
    knx.start();
}

void loop() 
{
    // don't delay here to much. Otherwise you might lose packages or mess up the timing with ETS
    knx.loop();

    // only run the application code if the device was configured with ETS
    if (!knx.configured())
        return;

    measureTemp();
}