C++ Blynk (Legacy) - Code Examples for Basic Tasks

Projects made with Blynk
17

#6 Matrix of LARGE Randomly Flashing & Coloured Virtual RGB “Super LEDs” (AKA Buttons)

I don’t know why I didn’t do this one sooner… less energy and at about 80% less “LEDs” to flash, it should be theoretically faster… well… it costs less energy at least :stuck_out_tongue: (3200 units of energy)

Challenge Question for the Developers… why is it seem faster to change the colour properties on 71 LEDs compared to 16 Buttons?

Screenshot_2018-02-24-21-41-27
Screenshot_2018-02-24-21-41-27.png600×800 32.3 KB

Even the QR looks more complex… but then Buttons do have more settings then an LED :stuck_out_tongue:
image

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

#include <ESP8266mDNS.h>  // For OTA
#include <WiFiUdp.h>  // For OTA
#include <ArduinoOTA.h>  // For OTA

#define BLYNK_NO_BUILTIN  // Disable built-in analog & digital pin operations
#define BLYNK_MAX_READBYTES 1024
#define BLYNK_MSG_LIMIT 0
#define BLYNK_HEARTBEAT 60

BlynkTimer timer;

char auth[] = "xxxxxxxxxx";
char ssid[] = "xxxxxxxxxx";
char pass[] = "xxxxxxxxxx";
//char server[] = "xxx.xxx.xxx.xxx";  // IP for your Local Server
char server[] = "blynk-cloud.com";  // URL for Blynk Cloud Server
int port = 8080;
String HEXstring;
int randLED;
int randIntensity;
int rrr, ggg, bbb;
int RandomTimer;



void setup() {
  WiFi.begin(ssid, pass); 
  // Preset for use on a Local Server... adjust as required for Cloud Server
  Blynk.config(auth, server, port);
  Blynk.connect();
  for (int i = 0; i <= 16; i++) {
    Blynk.virtualWrite(i, 1);  // Set Button ON
    Blynk.setProperty(i, "label", " ");  // Set Button Label to blank
    Blynk.setProperty(i, "color", "#000000");  // Set Button colour to black
  }
  RandomTimer = timer.setInterval(30L, RGBMatrix);
  ArduinoOTA.setHostname("ESP8266 BIG vRGB Matrix");  // For OTA
  ArduinoOTA.begin();  // For OTA
}



void loop() {
  Blynk.run();
  timer.run();
  ArduinoOTA.handle();
}



void RGBMatrix() {
  randLED = random(17);
  rrr = random(256);
  ggg = random(256);
  bbb = random(256);
  String strRED = String(rrr, HEX);  // Convert RED DEC to HEX.
  if (rrr < 16) {
    strRED = String("0" + strRED);  // Buffer with 0 if required.
  }  // END if
  String strGRN = String(ggg, HEX);  // Convert GREEN DEC to HEX.
  if (ggg < 16)  {
    strGRN = String("0" + strGRN);  // Buffer with 0 if required.
  }  // END if
  String strBLU = String(bbb, HEX);  // Convert BLUE DEC to HEX.
  if (bbb < 16)  {
    strBLU = String("0" + strBLU);  // Buffer with 0 if required.
  }  // END if
  String HEXstring = String("#" + strRED + strGRN + strBLU);  // Combine HEX fragments.
  Blynk.setProperty(randLED, "color", HEXstring);  // Set LED Label to HEX colour
}
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