一个简单的ESP8266WiFi时钟

首先，上效果图

你可能需要的准备

• 配置ESP8266的Arduino IDE环境 - IDZD
• NodeMCU连接&固件烧录 - IDZD
• 半离线安装EPS8266支持到Arduino IDE
• NTPClient库
• 安装支持库 - IDZD
• ESP8266使用I2C连接OLDE屏幕

连线&安装NTPClient库

安装NTPClient库

这次我们选择NTPClient库，联网获取ntp时间。

项目地址

#获取UNIX时间戳
getEpochTime();

#获取当前时间
getFormattedTime()；

#获取星期，0是星期日
getDay()；

连线

• D1 --- SDA
• D2 --- SCL
• 3V --- VCC
• G --- GND

2089953529.png

代码

#include <Arduino.h>
#include <U8g2lib.h>
#include <time.h>
#include <SPI.h>
#include <Wire.h>
#include <NTPClient.h>
// change next line to use with another board/shield
#include <ESP8266WiFi.h>
//#include <WiFi.h> // for WiFi shield
//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
#include <WiFiUdp.h>

#define SDA 05 //ESP8266 D1 PIN 05
#define SCL 04 //ESP8266 D2 PIN 04



const char *ssid     = "360 N7 Pro";
const char *password = "123456780";
char *week = "";


//SSD1306,128x64,全屏缓冲模式,模拟I2C,I2C,u8g2(旋转0度,时钟,数据,重置)
U8G2_SSD1306_128X64_NONAME_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE); 

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "ntp1.aliyun.com",60*60*8, 30*60*1000);//设置访问的ntp服务器

void setup(){
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while ( WiFi.status() != WL_CONNECTED ) {
    delay ( 500 );
    Serial.print ( "." );
  }

  timeClient.begin();
  u8g2.begin();
  u8g2.enableUTF8Print();
}

void loop() {
  timeClient.update();
  u8g2.setFont(u8g2_font_unifont_t_chinese2);
  u8g2.firstPage();  
  do {
    u8g2.setCursor(0, 15);
    u8g2.print("北京时间:="); 
    u8g2.setCursor(0, 35);
    u8g2.print(timeClient.getFormattedTime()); 
    u8g2.setCursor(75, 35);
    switch(timeClient.getDay()；){
      case 0:
            week = "Sun.";
            break;
      case 1:
            week = "Mon.";
            break;
      case 2:
            week = "Tues.";
            break;
      case 3:
            week = "Wed.";
            break;
      case 4:
            week = "Thur.";
            break;
      case 5:
            week = "Fri.";
            break;
      case 6:
            week = "Sat.";
            break;    
      }
    u8g2.print(week);  
    u8g2.setCursor(0, 55);
    time_t t;  
    struct tm *p;  
    t=timeClient.getEpochTime();  
    p=gmtime(&t);  
    char s[100];  
    //strftime(s, sizeof(s), "%Y-%m-%d %H:%M:%S", p);  
    strftime(s, sizeof(s), "%Y年%m月%d日", p);  
    u8g2.print(s);  
  } while ( u8g2.nextPage() );
  Serial.println(timeClient.getEpochTime());
  delay(1000);
}