使用Arduino +lvgl+esp32+tft_espi写一个网络天气时钟

很高兴回答你的问题，以下是使用Arduino、lvgl、esp32和tft_espi的示例代码实现网络天气时钟的方法：

#include <Arduino.h>
#include <TFT_eSPI.h>
#include <lvgl.h>
#include <WiFi.h>
#include <ArduinoJson.h>
#include <time.h>

#define WIFI_SSID "your_wifi_ssid"
#define WIFI_PASS "your_wifi_password"
#define OPENWEATHERMAP_APIKEY "your_openweathermap_api_key"

TFT_eSPI tft = TFT_eSPI(135, 240); // 设置 TFT 屏幕的大小
lv_obj_t * label_temperature, * label_temperature_symbol, * label_weather_description, * label_city_name, * label_clock;

void get_weather_data(String & temperature, String & weather_description, String & city_name) {
  WiFiClient client;
  if (!client.connect("api.openweathermap.org", 80)) {
    Serial.println("connection failed!");
    return;
  }

  String url = "/data/2.5/weather?q=Shenzhen,CN&appid=" OPENWEATHERMAP_APIKEY "&units=metric";

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: api.openweathermap.org\r\n" +
               "Connection: close\r\n\r\n");

  String response = "";
  while (client.connected()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") {
      break;
    }
  }
  while (client.available()) {
    response += (char)client.read();
  }

  const int capacity = JSON_OBJECT_SIZE(4) + 100;
  DynamicJsonDocument doc(capacity);
  deserializeJson(doc, response);
  JsonObject main = doc["main"];
  temperature = main["temp"].as<String>();
  JsonArray weather = doc["weather"];
  weather_description = weather[0]["description"].as<String>();
  city_name = doc["name"].as<String>();
}

void get_time_string(String & time_string) {
  time_t now;
  struct tm timeinfo;
  time(&now);
  localtime_r(&now, &timeinfo);
  char strftime_buf[64];
  strftime(strftime_buf, sizeof(strftime_buf), "%H:%M", &timeinfo);
  time_string = strftime_buf;
}

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

  lv_init();

  tft.init();
  tft.setRotation(3);
  tft.fillScreen(TFT_BLACK);

  lvgl_driver_init(&tft);
  lv_disp_drv_t disp_drv;
  lv_disp_drv_init(&disp_drv);
  disp_drv.buffer = &lvgl_buffer;
  disp_drv.flush_cb = lvgl_flush;
  lv_disp_drv_register(&disp_drv);

  lv_theme_t * theme = lv_theme_material_init(210, NULL);
  lv_theme_set_current(theme);

  label_temperature = lv_label_create(lv_scr_act(), NULL);
  lv_label_set_text(label_temperature, "temperature");
  lv_obj_align(label_temperature, NULL, LV_ALIGN_CENTER, 0, -40);
  label_temperature_symbol = lv_label_create(lv_scr_act(), NULL);
  lv_label_set_text(label_temperature_symbol, "°C");
  lv_obj_set_pos(label_temperature_symbol, lv_obj_get_x(label_temperature) + lv_obj_get_width(label_temperature), lv_obj_get_y(label_temperature));
  label_weather_description = lv_label_create(lv_scr_act(), NULL);
  lv_label_set_text(label_weather_description, "weather_description");
  lv_obj_align(label_weather_description, NULL, LV_ALIGN_CENTER, 0, 0);
  label_city_name = lv_label_create(lv_scr_act(), NULL);
  lv_label_set_text(label_city_name, "city_name");
  lv_obj_align(label_city_name, NULL, LV_ALIGN_CENTER, 0, 40);
  label_clock = lv_label_create(lv_scr_act(), NULL);
  lv_label_set_text(label_clock, "clock");
  lv_obj_align(label_clock, NULL, LV_ALIGN_CENTER, 0, 80);

  lv_task_create([](lv_task_t * task) {
    String temperature;
    String weather_description;
    String city_name;
    get_weather_data(temperature, weather_description, city_name);
    lv_label_set_text(label_temperature, temperature.c_str());
    lv_label_set_text(label_weather_description, weather_description.c_str());
    lv_label_set_text(label_city_name, city_name.c_str());
  }, 5000, LV_TASK_PRIO_LOW, NULL);

  lv_task_create([](lv_task_t * task) {
    String time_string;
    get_time_string(time_string);
    lv_label_set_text(label_clock, time_string.c_str());
  }, 1000, LV_TASK_PRIO_MID, NULL);

  WiFi.begin(WIFI_SSID, WIFI_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
  }

  Serial.println("setup complete!");
}

void loop() {
  lv_task_handler();
  delay(1);
}

该代码使用了 OpenWeatherMap API 获取深圳的当前天气数据，在屏幕上输出温度、天气描述和城市名称，通过 `lv_task_create` 函数设置定时任务每 5 秒钟更新一次天气信息和每秒钟更新一次当前时间，是一个简单而实用的网络天气时钟的实现方式。

注：这里使用的API Key只是做演示，请勿用于商业用途，如有需要请自行注册。