IR Remote LED Controller

// IR Remote LED Controller - control an LED's brightness with a TV-style remote.
// The VS1838B receiver picks up invisible infrared light pulses from a remote
// and the IRremote library turns them back into button codes (NEC protocol).
// While the sketch runs, a Virtual IR remote panel appears - click its buttons!
// UP/DOWN change brightness, OK toggles power, 1/2/3 jump to preset levels.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <IRremote.hpp>

#define RECV_PIN 14
#define LED_PIN 4

Adafruit_SSD1306 display(128, 64, &Wire, -1);

int brightness = 153;   // 0..255
bool power = false;

void showState(const char* keyName) {
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.print("IR REMOTE LED");
  display.setCursor(0, 14);
  display.print("Key: ");
  display.print(keyName);
  display.setTextSize(2);
  display.setCursor(0, 28);
  if (power) {
    display.print(brightness);
  } else {
    display.print("OFF");
  }
  display.setTextSize(1);
  int bar = (brightness * 120) / 255;
  display.setCursor(0, 50);
  display.print("[");
  for (int i = 0; i < 12; i++) {
    if (i * 10 < bar) {
      display.print("#");
    } else {
      display.print("-");
    }
  }
  display.print("]");
  display.display();
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  Wire.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.display();
  IrReceiver.begin(RECV_PIN, ENABLE_LED_FEEDBACK);
  Serial.println("IR remote LED controller ready - press a remote button");
  showState("none");
}

void loop() {
  if (IrReceiver.decode()) {
    int cmd = IrReceiver.decodedIRData.command;
    const char* keyName = "?";

    if (cmd == 0x18) {            // UP arrow
      keyName = "UP";
      brightness = brightness + 51;
      if (brightness > 255) brightness = 255;
      power = true;
    } else if (cmd == 0x52) {     // DOWN arrow
      keyName = "DOWN";
      brightness = brightness - 51;
      if (brightness < 0) brightness = 0;
      power = true;
    } else if (cmd == 0x1C) {     // OK button
      keyName = "OK";
      power = !power;
    } else if (cmd == 0x45) {     // key 1 - dim preset
      keyName = "1";
      brightness = 64;
      power = true;
    } else if (cmd == 0x46) {     // key 2 - medium preset
      keyName = "2";
      brightness = 128;
      power = true;
    } else if (cmd == 0x47) {     // key 3 - full preset
      keyName = "3";
      brightness = 255;
      power = true;
    }

    int duty = 0;
    if (power) duty = brightness;
    analogWrite(LED_PIN, duty);

    Serial.print("IR cmd=0x");
    Serial.print(cmd, HEX);
    Serial.print(" ");
    Serial.print(keyName);
    Serial.print("  bright=");
    Serial.print(brightness);
    Serial.print("  power=");
    if (power) {
      Serial.println("ON");
    } else {
      Serial.println("OFF");
    }

    showState(keyName);
    IrReceiver.resume();   // ready for the next button
  }
  delay(50);
}