#define BLYNK_TEMPLATE_ID "TMPL6PQgN1c4W"
#define BLYNK_TEMPLATE_NAME "15289"
#define BLYNK_AUTH_TOKEN "exNS3EcFLNHyG3G0fZ7EgWEFBDNT_5-3"


#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// ===== WiFi =====
const char* WIFI_SSID = "Wokwi-GUEST";
const char* WIFI_PASS = "";

// ===== Pins (ตามการต่อจริง) =====
#define DHTPIN   4
#define DHTTYPE  DHT22
#define TRIG_PIN 5
#define ECHO_PIN 18
#define RED_PIN   14
#define GREEN_PIN 27
#define BLUE_PIN  26
#define I2C_SDA  21
#define I2C_SCL  22

// ===== OLED =====
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// ===== Objects/State =====
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

bool manualOverride = false;            // V3: 1=บังคับแดงค้าง, 0=Auto
unsigned long lastBlink = 0, lastDht = 0;
bool blinkOn = false;
const unsigned long BLINK_MS = 200;
const unsigned long DHT_MS   = 2500;

float tempC = NAN, humi = NAN, distCM = NAN;

// ---------- Helpers ----------
float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH); delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  unsigned long us = pulseIn(ECHO_PIN, HIGH, 60000UL); // 60ms timeout
  if (us == 0) return NAN;
  return (us * 0.0343f) / 2.0f;
}

void setRGB(uint8_t r, uint8_t g, uint8_t b) {
  // ถ้าเป็น Common Anode ให้ใช้ 255-ค่า
  analogWrite(RED_PIN,   r);
  analogWrite(GREEN_PIN, g);
  analogWrite(BLUE_PIN,  b);
}

void showOnOLED(const char* modeTxt) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);

  display.print("Temp: "); if (isnan(tempC)) display.println("--"); else { display.print(tempC,1); display.println(" C"); }
  display.print("Humi: "); if (isnan(humi))  display.println("--"); else { display.print(humi,1);  display.println(" %"); }
  display.print("Dist: "); if (isnan(distCM))display.println("--"); else { display.print(distCM,1); display.println(" cm"); }
  display.print("Mode: "); display.println(modeTxt);
  
  display.setCursor(0, 54);            // บรรทัดล่างของจอ 64px
  display.println("Kanyakorn 15289");
  
  display.display();
}

// ---------- Blynk ----------
BLYNK_WRITE(V3) {                      // Switch 0/1
  manualOverride = (param.asInt() == 1);
}
BLYNK_CONNECTED() {
  // บังคับให้เริ่มจาก OFF เพื่อกัน MANUAL ค้าง
  manualOverride = false;
  Blynk.virtualWrite(V3, 0);
  Blynk.syncVirtual(V3);
}

// ---------- Main tick (100ms) ----------
void tick() {
  unsigned long now = millis();

  // DHT: อ่านไม่ถี่กว่า 2.5s
  if (now - lastDht >= DHT_MS) {
    lastDht = now;
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    if (!isnan(h)) { humi = h; Blynk.virtualWrite(V1, humi); }
    if (!isnan(t)) { tempC = t; Blynk.virtualWrite(V0, tempC); }
  }

  // ระยะ (อ่านได้บ่อย)
  float d = readDistanceCM();
  if (!isnan(d)) { distCM = d; Blynk.virtualWrite(V2, distCM); }

  // ควบคุมไฟ
  const char* modeTxt = "AUTO";
  if (manualOverride) {
    setRGB(255,0,0); modeTxt = "MANUAL";
  } else {
    if (isnan(distCM)) {
      setRGB(0,0,0);
    } else if (distCM < 20) {
      setRGB(255,0,0);
    } else if (distCM <= 30) {
      if (now - lastBlink >= BLINK_MS) { lastBlink = now; blinkOn = !blinkOn; }
      setRGB(blinkOn ? 255 : 0, blinkOn ? 255 : 0, 0); // เหลืองกระพริบ
    } else {
      setRGB(0,0,255);
    }
  }

  // แสดงผล + ดีบัก
  showOnOLED(modeTxt);
  Serial.printf("WiFi=%s Blynk=%s  T=%.1f H=%.1f D=%.1f  MODE=%s\n",
    WiFi.isConnected()?"OK":"NO",
    Blynk.connected()?"OK":"NO",
    isnan(tempC)?-999:tempC,
    isnan(humi)?-999:humi,
    isnan(distCM)?-999:distCM,
    modeTxt);
}

// ---------- Setup / Loop ----------
void setup() {
  Serial.begin(115200);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  setRGB(0,0,0);

  Wire.begin(I2C_SDA, I2C_SCL);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Booting...");
  display.display();

  dht.begin();

  Blynk.begin(BLYNK_AUTH_TOKEN, WIFI_SSID, WIFI_PASS);

  timer.setInterval(100L, tick);
}

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