#include "DHT.h"
#define sensorPin 51
#define DHTTYPE DHT22

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

DHT dht_sensor(sensorPin, DHTTYPE);

const int SCREEN_WIDTH = 128; // OLED display width
const int SCREEN_HEIGHT = 64; // OLED display height
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// 模拟时间（递增秒数）
unsigned long lastUpdate = 0;
int seconds = 0;

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHT22 example!"));

  dht_sensor.begin();

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (true); // 停止程序
  }

  display.clearDisplay();
  display.display();
}

void loop() {
  // 每 1 秒更新一次模拟时间
  if (millis() - lastUpdate >= 1000) {
    lastUpdate = millis();
    seconds++;
  }

  // 模拟当前时间（你之后可以替换为 RTC 实时时间）
  int hr = (seconds / 3600) % 24;
  int min = (seconds / 60) % 60;
  int sec = seconds % 60;

  // 读取传感器数据
  float temperature = dht_sensor.readTemperature();
  float humidity = dht_sensor.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // 在串口打印数据
  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.print(F("%  Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C"));

  // OLED 显示格式化输出
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);

  display.setCursor(0, 0);
  display.println(F("Time      Humi  Temp"));

  char line[32];
  sprintf(line, "%02d:%02d:%02d    %.0f%%   %.0f\xB0""C", hr, min, sec, humidity, temperature);
  // 说明：\xB0 是 "°" 符号的 ASCII 十六进制

  display.setCursor(0, 20);
  display.println(line);

  display.display();

  delay(1000);
}