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--- en:iot:examples:rgb [2020/07/20 14:26] – external edit 127.0.0.1
+++ en:iot:examples:rgb [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
+======  RGB LED example======
+LED RGB module must be connected to controller module or with sensor module.
+{{:en:iot:examples:rgbpicture1.jpg?200|}}
+{{:en:iot:examples:rgbpicture2.jpg?200|}}
+Needed libraries:
+<code>lib_deps = ITTIoT, Adafruit NeoPixel</code>
+The example code above lights the RGB LED
+<code c>
+#include <Arduino.h>
+#include <ittiot.h>
+#include <Adafruit_NeoPixel.h>
+#define MODULE_TOPIC "ESP30/rgb"
+#define WIFI_NAME "name"
+#define WIFI_PASSWORD "password"
+//Stating, to which PIN the RGB LED has been connected
+#define PIN            D2
+// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
+// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
+// example for more information on possible values.
+Adafruit_NeoPixel pixels = Adafruit_NeoPixel(1, PIN, NEO_GRB + NEO_KHZ800);
+// Splitting string into smaller parts, so that the colour code can be set to the RGB LED
+// https://stackoverflow.com/questions/9072320/split-string-into-string-array
+String getValue(String data, char separator, int index)
+{
+  int found = 0;
+  int strIndex[] = {0, -1};
+  int maxIndex = data.length()-1;
+  for(int i=0; i<=maxIndex && found<=index; i++)
+  {
+    if(data.charAt(i)==separator || i==maxIndex)
+    {
+        found++;
+        strIndex[0] = strIndex[1]+1;
+        strIndex[1] = (i == maxIndex) ? i+1 : i;
+    }
+  }
+  return found>index ? data.substring(strIndex[0], strIndex[1]) : "";
+}
+// Changes the RGB LED color and send this info to the computer over COM port
+// mosquitto_pub -u test -P test -t "ITT/IOT/3/rgb" -m "51;255;153"
+void iot_received(String topic, String msg)
+{
+  Serial.print("MSG FROM USER callback, topic: ");
+  Serial.print(topic);
+  Serial.print(" payload: ");
+  Serial.println(msg);
+  if(topic == MODULE_TOPIC)
+  {
+    // Splitting the RGB values into smaller parts
+    String r = getValue(msg,';',0);
+    String g = getValue(msg,';',1);
+    String b = getValue(msg,';',2);
+    Serial.print("R: ");
+    Serial.println(r);
+    Serial.print("G: ");
+    Serial.println(g);
+    Serial.print("B: ");
+    Serial.println(b);
+    // Sending the color code to the RGB LED
+    pixels.setPixelColor(0, r.toInt(), g.toInt(), b.toInt()); // Moderately bright green color. The 0 number addresses the first RGB LED (is the address number)
+    pixels.show(); // This sends the updated pixel color to the hardware.
+  }
+}
+// Subscrining to a MQTT topic, to get the RGB color code for the RGB LED
+void iot_connected()
+{
+  Serial.println("MQTT connected callback");
+  iot.subscribe(MODULE_TOPIC);
+  iot.log("IoT NeoPixel example!");
+}
+// Setting up some parameters for the ESP microcontroller
+void setup()
+{
+  Serial.begin(115200); // setting up serial connection parameter
+  Serial.println("Booting");
+  //iot.setConfig("wname", WIFI_NAME);
+  //iot.setConfig("wpass", WIFI_PASSWORD);
+  iot.printConfig(); // print json config to serial
+  iot.setup();
+  pixels.begin(); // This initializes the NeoPixel library.
+}
+//Main code, which runs in loop
+void loop()
+{
+  iot.handle(); // Calls iot.handle out
+  delay(200); // Delay of 200 ms
+}
+</code>