WiFi RGB Control

Difficulty: ● ● ● ● ○

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  • Did you know ?

    Did you know that in 1893, Nikola Tesla demonstrated wireless control of lights at the Chicago World’s Fair—using resonance and high‑frequency currents decades before Wi‑Fi existed? Few people know he lit phosphorescent lamps wirelessly, shocking the audience who had never seen light without wires.

Parts Required

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How It Works ?

Wi‑Fi Connection: The GENESIS module connects to your Wi‑Fi network, enabling wireless control.
Slider Input: A phone or tablet sends brightness and color data via a simple web page.
PWM Control: The module adjusts red, green, and blue LED channels using pulse‑width modulation.
Instant Feedback: The LED color and brightness change instantly as sliders move.

GENESIS

Connection Guide

Snap your modules as shown above, copy the code into the Arduino IDE and Click upload

example.ino 
#include <WiFi.h>
#include <WebServer.h>

const char* ssid     = "SSID"; //your router SSID
const char* password = "password"; //your router password

// --- FIXED IP ---
IPAddress local_IP(192, 168, 1, 27);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);

#define RED_PIN   17
#define GREEN_PIN 21
#define BLUE_PIN   4

WebServer server(80);

int brightness = 128;   // 0–255
int hue = 0;            // 0–360

void hueToRGB(int h, int v, int &r, int &g, int &b) {
  float hh = h / 60.0;
  int i = int(hh) % 6;
  float f = hh - int(hh);
  int p = 0;
  int q = (int)(v * (1 - f));
  int t = (int)(v * f);

  switch (i) {
    case 0: r = v; g = t; b = p; break;
    case 1: r = q; g = v; b = p; break;
    case 2: r = p; g = v; b = t; break;
    case 3: r = p; g = q; b = v; break;
    case 4: r = t; g = p; b = v; break;
    default:r = v; g = p; b = q; break;
  }
}

void updateLED() {
  int r, g, b;
  hueToRGB(hue, brightness, r, g, b);
  ledcWrite(RED_PIN,   r);
  ledcWrite(GREEN_PIN, g);
  ledcWrite(BLUE_PIN,  b);
}

String htmlPage() {
  String page = R"rawliteral(
<!DOCTYPE html><html><head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>body{background:#111;color:white;text-align:center;font-family:Arial}
input{width:80%;height:40px;margin:20px}</style></head><body>
<h2>RGB LED Control</h2>
<label>Brightness</label><br>
<input type="range" min="0" max="255" value=")" + String(brightness) + R"(" id="brightness"><br>
<label>Color Hue</label><br>
<input type="range" min="0" max="360" value=")" + String(hue) + R"(" id="color"><br>
<script>
function sendData(url){fetch(url).catch(e=>console.log(e));}
document.getElementById("brightness").addEventListener("input", e=>sendData("/brightness?val="+e.target.value));
document.getElementById("color").addEventListener("input", e=>sendData("/color?val="+e.target.value));
</script></body></html>)rawliteral";
  return page;
}

void handleRoot()       { server.send(200, "text/html", htmlPage()); }
void handleBrightness() { if (server.hasArg("val")) { brightness = server.arg("val").toInt(); updateLED(); } server.send(200, "text/plain", "OK"); }
void handleColor()      { if (server.hasArg("val")) { hue = server.arg("val").toInt(); updateLED(); } server.send(200, "text/plain", "OK"); }

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

  ledcAttach(RED_PIN,   5000, 8);
  ledcAttach(GREEN_PIN, 5000, 8);
  ledcAttach(BLUE_PIN,  5000, 8);

  if (!WiFi.config(local_IP, gateway, subnet)) {
    Serial.println("Failed to configure Static IP");
  }
  WiFi.begin(ssid, password);
  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); }
  Serial.println("\nConnected! IP: " + WiFi.localIP().toString());

  server.on("/", handleRoot);
  server.on("/brightness", handleBrightness);
  server.on("/color", handleColor);
  server.begin();

  updateLED();
}

void loop() { server.handleClient(); }