ESP8266+OLED屏实现天气预报+温度显示+NTP时间同步4屏带中文显示程序

很高兴听到您对ESP8266 OLED屏幕的应用感兴趣。下面是一个简单的程序示例，它可以实现天气预报、温度显示、NTP时间同步和中文显示。

首先，您需要准备以下材料：

- ESP8266开发板（如NodeMCU）
- OLED屏幕（如0.96英寸128x64 OLED）
- DHT11温湿度传感器
- 一些杜邦线
- Arduino IDE（或其他适当的IDE）

接下来，让我们开始编写程序：

1. 引入所需库文件

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

2. 定义OLED屏幕对象和温湿度传感器对象

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#define DHTPIN 5
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

3. 定义WiFi连接信息和NTP服务器信息

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* ntpServerName = "cn.pool.ntp.org";
const int timeZone = 8;
WiFiUDP udp;
IPAddress localIP;

4. 连接WiFi和获取本地IP地址

void connectWiFi() {
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  localIP = WiFi.localIP();
  Serial.println(localIP);
}

5. 从NTP服务器获取当前时间

void getNTPTime() {
  byte packetBuffer[NTP_PACKET_SIZE];
  memset(packetBuffer, 0, NTP_PACKET_SIZE);
  packetBuffer[0] = 0b11100011;
  packetBuffer[1] = 0;
  packetBuffer[2] = 6;
  packetBuffer[3] = 0xEC;
  packetBuffer[12] = 49;
  packetBuffer[13] = 0x4E;
  packetBuffer[14] = 49;
  packetBuffer[15] = 52;
  udp.beginPacket(ntpServerName, 123);
  udp.write(packetBuffer, NTP_PACKET_SIZE);
  udp.endPacket();
  delay(1000);
  int cb = udp.parsePacket();
  if (cb) {
    udp.read(packetBuffer, NTP_PACKET_SIZE);
    unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
    unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
    unsigned long secsSince1900 = highWord << 16 | lowWord;
    const unsigned long seventyYears = 2208988800UL;
    unsigned long epoch = secsSince1900 - seventyYears;
    epoch += timeZone * SECS_PER_HOUR;
    setTime(epoch);
  }
}

6. 定义获取天气信息的函数

void getWeather() {
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect("api.openweathermap.org", httpPort)) {
    Serial.println("connection failed");
    return;
  }
  String url = "/data/2.5/weather?q=Beijing,cn&lang=zh_cn&units=metric&appid=your_APPID";
  Serial.print("Requesting URL: ");
  Serial.println(url);
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: api.openweathermap.org\r\n" +
               "Connection: close\r\n\r\n");
  while (!client.available()) {
    delay(100);
  }
  String line;
  while (client.available()) {
    line = client.readStringUntil('\r');
    if (line.indexOf("\"temp\":") >= 0) {
      String temp = line.substring(line.indexOf("\"temp\":") + 7, line.indexOf(","));
      Serial.println("Temperature: " + temp + "°C");
      display.setCursor(0, 10);
      display.print("Temperature: ");
      display.print(temp);
      display.print("C");
    }
    if (line.indexOf("\"description\":") >= 0) {
      String desc = line.substring(line.indexOf("\"description\":") + 15, line.indexOf("\","));
      Serial.println("Description: " + desc);
      display.setCursor(0, 20);
      display.print("Description: ");
      display.print(desc);
    }
  }
}

7. 在setup函数中初始化各组件

void setup() {
  Serial.begin(115200);
  dht.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
  connectWiFi();
  udp.begin(2390);
  setSyncProvider(getNTPTime);
  display.setCursor(0, 0);
  display.print("IP address: ");
  display.println(localIP);
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("NTP time: ");
  display.println(getFormattedTime());
  display.display();
  delay(2000);
  display.clearDisplay();
  getWeather();
}

8. 在loop函数中更新温湿度和时间

void loop() {
  delay(2000);
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  display.setCursor(0, 30);
  display.print("Temp: ");
  display.print(t);
  display.print("C");
  display.setCursor(0, 40);
  display.print("Humidity: ");
  display.print(h);
  display.print("%");
  display.setCursor(0, 50);
  display.print("Time: ");
  display.println(getFormattedTime());
  display.display();
}

9. 定义一个辅助函数，将当前时间格式化为字符串

String getFormattedTime() {
  char buffer[20];
  sprintf(buffer, "%02d:%02d:%02d", hour(), minute(), second());
  return String(buffer);
}

这只是一个简单的程序示例，您可以根据自己的需要进行修改和扩展。希望对您有所帮助。