new device type: led

things/DeviceLed.cpp

@@ -0,0 +1,100 @@
+#include "DeviceLed.h"
+
+void DeviceLed::setLed(int value) {
+  analogWrite(pinLed, value);
+}
+
+void DeviceLed::publishStatus() {
+  DynamicJsonBuffer json_outBuffer;
+  JsonObject& json_out = json_outBuffer.createObject();
+  json_out["brightness"] = brightness;
+  String response;
+  json_out.printTo(response);
+  Serial.print("led state: ");
+  Serial.println(response);
+  Homie.setNodeProperty(ledNode, "brightness", response);
+}
+
+void DeviceLed::deviceSetup() {
+  pinMode(pinLed, OUTPUT);
+  setLed(brightness);
+}
+
+bool DeviceLed::ledOnHandler(String value) {
+  if (value == "true") {
+    setLed(brightness);
+    Homie.setNodeProperty(ledNode, "on", "true");
+    Serial.println("led is on");
+  } else if (value == "false") {
+    setLed(0);
+    Homie.setNodeProperty(ledNode, "on", "false");
+    Serial.println("led is off");
+  } else {
+    return false;
+  }
+  return true;
+}
+
+bool DeviceLed::ledBrightnessHandler(String message) {
+  DynamicJsonBuffer json_inBuffer;
+  JsonObject& json_in = json_inBuffer.parseObject(message);
+  if (json_in.success()) {
+    if (json_in.containsKey("brightness")) {
+      brightness = json_in["brightness"];
+    }
+    setLed(brightness);
+  } else {
+    Serial.println("parsing of JSON failed");
+  }
+  publishStatus();
+  return true;
+}
+
+bool DeviceLed::ledFadeHandler(String message) {
+  DynamicJsonBuffer json_inBuffer;
+  JsonObject& json_in = json_inBuffer.parseObject(message);
+  if (json_in.success()) {
+    fade_from = brightness;
+    if (json_in.containsKey("brightness")) {
+      fade_to = json_in["brightness"];
+    } else {
+      fade_to = brightness;
+    }
+    fade_start = millis();
+    if (json_in.containsKey("seconds")) {
+      fade_end = fade_start + 1000 * (int)json_in["seconds"];
+    } else {
+      fade_end = 0;
+    }
+    fading = true;
+  } else {
+    Serial.println("parsing of JSON failed");
+  }
+  return true;
+}
+
+void DeviceLed::deviceRegister() {
+  ledNode.subscribe("on", [this](String value) { return ledOnHandler(value); });
+  ledNode.subscribe("brightness", [this](String value) { return ledBrightnessHandler(value); });
+  ledNode.subscribe("fade", [this](String value) { return ledFadeHandler(value); });
+  Homie.registerNode(ledNode);
+}
+
+void DeviceLed::deviceLoop() {
+  if (fading) {
+    if (fade_end > millis()) {
+      float progress = 1.0 * (millis() - fade_start) / (fade_end - fade_start);
+      if ((int)(progress * 100) != (int)(progress_last * 100)) {
+        brightness = fade_from + (fade_to - fade_from) * progress;
+        setLed(brightness);
+        progress_last = progress;
+      }
+    } else {
+      brightness = fade_to;
+      setLed(brightness);
+      publishStatus();
+      fading = false;
+    }
+  }
+  return;
+}

things/DeviceLed.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "Device.h"
+#include <Homie.h>
+
+class DeviceLed : public Device {
+  public:
+    inline DeviceLed(byte ledPin) {
+      pinLed = ledPin;
+    }
+    virtual void deviceSetup();
+    virtual void deviceRegister();
+    virtual void deviceLoop();
+  private:
+    byte pinLed;
+    int brightness = 0;
+    bool fading = false;
+    int fade_from, fade_to;
+    unsigned long fade_start = 0;
+    unsigned long fade_end = 0;
+    float progress_last = 0;
+    void setLed(int value);
+    void publishStatus();
+    bool ledOnHandler(String value);
+    bool ledBrightnessHandler(String message);
+    bool ledFadeHandler(String message);
+    HomieNode ledNode{"led", "led"};
+};

things/things.ino

@@ -1,5 +1,6 @@
 #include <Homie.h> // https://github.com/marvinroger/homie-esp8266
 
+#include "DeviceLed.h"
 #include "DeviceRgb.h"
 #include "DeviceLdr.h"
 #include "DeviceDht.h"
@@ -7,6 +8,9 @@
 #include "DeviceIrTx.h"
 #include "DeviceButton.h"
 
+const byte PIN_LED = D8;
+DeviceLed deviceLed(PIN_LED);
+
 const byte PIN_RGB_RED = D8;
 const byte PIN_RGB_GREEN = D6;
 const byte PIN_RGB_BLUE = D7;
@@ -30,6 +34,7 @@ const byte PIN_BUTTON = D2;
 DeviceButton deviceButton(PIN_BUTTON);
 
 Device* devices[] = {
+  &deviceLed,
   &deviceRgb,
   &deviceLdr,
   &deviceDht,