lastRecv = millis(); newDataComing = true; delay(2); } else { now = millis(); if ((now - lastRecv > 100) && (newDataComing == true)) { //Serial.print("recv Data "); //Serial.print(strRecv); boolean isOK = client
data types in our applications. While using different type of variables we may need to convert th...
11.12 double(双精度浮点数) 11.13 string( char array/字符串) 11.14 String object( String类) 11.15 array(数组) 十二、数据类型转换 12.1 char() 12.2 byte() 12.3int() 12.4 word() 12.5 long() 12.6 float() 十三、变量作用域&修饰符 13.1 variable scope(变量的作用域) 13.2 static(静态变量) 13.3...
uint8_tlevels){Serial.printf("Listing directory: %sn",dirname);File root=fs.open(dirname);if(!root){Serial.println("Failedto open directory");return;}if(!root.isDirectory()){Serial.println("Not a directory");return;}File file=root.openNextFile();while(file){if(file.isDirectory()...
// prints "123456" or whatever the value of millis() is: Serial.println(stringOne); // using a float and the right decimal places: stringOne = String(5.698, 3); Serial.println(stringOne); // using a float and less decimal places to use rounding: ...
phTimes = millis();int raw = analogRead(photosensitivePin);raw = constrain(raw, 10, 1024);photoContent = map(raw, 10, 1024, 100, 0);currentBrightness = map(100 - photoContent, 0, 100, 0, 255);}}void handleGestureBrightness() {if (millis() - lastFadeTime >= fadeInterval) {last...
millis函数可通过返回值、返回获取机器运行的时间长度,单位为ms。系统最长的记录时间为9小时22分,如果超出时间从0开始。函数返回值为unsigned long 型,无参数。 delay(ms); delay函数为一个延时函数,曾在Blink程序中用到,参数表示设置的延长时间,单位ms。
time_last[io]=millis(); time_low_delay[io]=long(1000.0*((cmd.substring(string_k[0]+1,string_k[1])).toFloat())); time_high_delay[io]=long(1000.0*((cmd.substring(string_k[1]+1)).toFloat())); Serial.println(io,DEC);
#include<Arduino.h>booleanat_exec(char*data,char*keyword,unsigned long time_out){Serial.println(data);Serial.flush();delay(100);// 等待响应unsigned long start=millis();while(Serial.available()<strlen(keyword)){if(millis()-start>time_out)returnfalse;}if(Serial.find(keyword))returntrue;else...
StringScan_QR(){unsignedlongstarttime; String str =""; Serial3.write(Wakecmd,9);//等待回收信号结束while(Serial3.read() !=0x31); starttime = millis();while(true) {//扫码模块扫出来是会加换行符的str = Serial3.readStringUntil('/r');if((str.length() >=7) || (millis() - startti...