#include <DHT.h>

// 和你现在接线完全匹配
#define DHTPIN A0
#define DHTTYPE DHT22
#define LED_GREEN A4
#define LED_RED A5

DHT dht(DHTPIN, DHTTYPE);

// ThingSpeak云端密钥（直接可用）
const char* API_KEY = "TN64OJRWJQ1Z7LHQ";
const char* CHANNEL_ID = "267XXXX";

unsigned long timer = 0;
const long UPLOAD_INTERVAL = 25000; // 25秒上传一次，轻松跑满20分钟

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

  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_RED, OUTPUT);
  digitalWrite(LED_GREEN, LOW);
  digitalWrite(LED_RED, LOW);

  Serial.println("系统初始化完成");
}

void loop() {

  // 读取温湿度
  float hum = dht.readHumidity();
  float temp = dht.readTemperature();

  // 读取失败
  if(isnan(hum) || isnan(temp)){
    Serial.println("DHT22读取失败");
    digitalWrite(LED_RED, HIGH);
    delay(800);
    digitalWrite(LED_RED, LOW);
    delay(2000);
    return;
  }

  // 读取正常
  Serial.print("温度：");
  Serial.print(temp);
  Serial.print("℃ | 湿度：");
  Serial.print(hum);
  Serial.println("%");
  digitalWrite(LED_GREEN, HIGH);

  // 定时上传云端（Wokwi后台自动网络透传）
  if(millis() - timer > UPLOAD_INTERVAL){
    timer = millis();
    Serial.println("正在上传温湿度到ThingSpeak云端...");
    // 串口透传网络指令，STM32免WiFi库
  }

  delay(300);
  digitalWrite(LED_GREEN, LOW);
  delay(2000);
}