#define Echo D2
#define Trig D8
#define BEEP D5

long getTime()
{
digitalWrite(Trig,HIGH);
delayMicroseconds(10);//维持10秒
digitalWrite(Trig,LOW);//引脚初始化
return pulseIn(Echo,HIGH);//某个引脚电平维持时间
}

void setup() {
// put your setup code here, to run once:
pinMode(Echo,INPUT);
pinMode(Trig,OUTPUT);
Serial.begin(115200);//打开串口
pinMode(BEEP,OUTPUT);
digitalWrite( BEEP,HIGH);

}
void loop() {
// put your main code here, to run repeatedly;
long dis;
dis=getTime()/58;//獲取距離
Serial.print(dis);
Serial.println(“cm”);
delay(500);
if(dis > 8){
digitalWrite(BEEP,LOW);
}else{
digitalWrite(BEEP,HIGH);
}
}

#include <ESP8266WiFi.h>
char* ssid = “Tenda_833D40”;//wifi热点名称
char* passwd= “82673964”;//WiFi密码
int port = 8888; //服務器端口号
WiFiServer server(port); // 设置服务器端口号

void initWifiSta()
{
WiFi.mode(WIFI_STA); // 设置STA模式
WiFi.begin(ssid, passwd); //连接网络
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println(WiFi.localIP()); //通过串口打印wemos的IP地址
}
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
//启动wifi
initWifiSta();
server.begin();//启动服务器
}
void loop() {
// put your main code here, to run repeatedly:
int cmd;
WiFiClient client = server.available(); //服务初始化
while (client.connected()) { //等待客户端连接
while (client.available() > 0) { //有数据到来，类似串口的那个函数
cmd = client.read();//读取数据
if(cmd == ‘1’){
Serial.println(“wu kai da”);
}else{
Serial.println(“wu kai shi da”);
}

}
}
}