基于stc89c52RC单片机，通过esp8266连接知心天气并将数据显示在lcd1602上的完整代码

这是一个基于STC89C52RC单片机和ESP8266模块连接知心天气API并将数据显示在LCD1602上的完整代码：

#include <reg52.h>
#include <stdio.h>
#include <string.h>

#define LCD_DATA P0
sbit RS = P2^0;
sbit RW = P2^1;
sbit EN = P2^2;

void delay(unsigned int i)
{
    while(i--);
}

void lcdcmd(unsigned char cmd)
{
    LCD_DATA=cmd;
    RS=0;
    RW=0;
    EN=1;
    delay(5);
    EN=0;
}

void lcddata(unsigned char dat)
{
    LCD_DATA=dat;
    RS=1;
    RW=0;
    EN=1;
    delay(5);
    EN=0;
}

void lcdinit(void)
{
    lcdcmd(0x38);
    lcdcmd(0x0c);
    lcdcmd(0x06);
    lcdcmd(0x01);
}

void lcddisplay(unsigned char *s)
{
    while(*s)
    {
        lcddata(*s++);
    }
}

void init_serial()
{
    SCON = 0x50; //8位数据，可变波特率
    TMOD = 0x20; //设置定时器1为模式2
    TH1 = 0xfd; //设定波特率为9600bps
    TL1 = 0xfd; //设定波特率为9600bps
    TR1 = 1; //启动定时器1
    ES = 1; //使能串口中断
    EA = 1; //开总中断
}

void send_char(unsigned char c)
{
    SBUF = c;
    while(!TI);
    TI = 0;
}

void send_string(unsigned char *s)
{
    while(*s)
    {
        send_char(*s++);
    }
}

unsigned char receive_char(void)
{
    while(!RI);
    RI=0;
    return SBUF;
}

void receive_string(unsigned char *s)
{
    unsigned char i=0;
    do
    {
        s[i] = receive_char();
    }
    while(s[i++]!='\r');
    s[--i]='\0';
}

void esp8266_init(void)
{
    send_string("AT+CWMODE=1\r\n");
    delay(10000);
    send_string("AT+RST\r\n");
    delay(15000);
    send_string("AT+CIPMUX=0\r\n");
    delay(1000);
}

void get_weather(unsigned char *weather_str)
{
    send_string("AT+CIPSTART=\"TCP\",\"api.seniverse.com\",80\r\n");
    delay(5000);
    send_string("AT+CIPSEND\r\n");
    delay(3000);
    send_string("GET /v3/weather/now.json?key=your_api_key&location=ip HTTP/1.1\r\n");
    send_string("Host: api.seniverse.com\r\n");
    send_string("Connection: close\r\n");
    send_string("\r\n");
    delay(5000);
    receive_string(weather_str);
}

void main()
{
    unsigned char weather_str[300];
    unsigned char weather[20];
    unsigned char temperature[10];
    unsigned char humidity[10];
    unsigned char *ptr;
    lcdinit();
    init_serial();
    esp8266_init();
    while(1)
    {
        get_weather(weather_str);
        ptr = strstr(weather_str,"\"text\":\"");
        ptr += 8;
        strncpy(weather,ptr,strchr(ptr,'\"')-ptr);
        ptr = strstr(weather_str,"\"temperature\":\"");
        ptr += 15;
        strncpy(temperature,ptr,strchr(ptr,'\"')-ptr);
        ptr = strstr(weather_str,"\"humidity\":\"");
        ptr += 12;
        strncpy(humidity,ptr,strchr(ptr,'\"')-ptr);
        lcdcmd(0x01);
        lcddisplay("Weather:");
        lcddisplay(weather);
        lcdcmd(0xc0);
        lcddisplay("Temp:");
        lcddisplay(temperature);
        lcddisplay("C");
        lcdcmd(0x90);
        lcddisplay("Humidity:");
        lcddisplay(humidity);
        lcddisplay("%");
        delay(5000);
    }
}

void serial_interrupt() interrupt 4
{
    if(RI)
    {
        RI = 0;
    }
    if(TI)
    {
        TI = 0;
    }
}

请注意，此代码中的 "your_api_key" 需要替换为您自己的知心天气API密钥。此外，您需要将ESP8266连接到正确的Wi-Fi网络并更改代码中的IP地址（或域名）以适应您的应用程序。