differentphaseinthewaycomputernetworkswereused.Whenthefirsteditionappearedin1980,networkswereanacademiccuriosity.Whenthesecondeditionappearedin1988,networkswereusedbyuniversitiesandlargebusinesses.Whenthethirdeditionappearedin1996,computernetworks,especiallytheInternet,hadbecomeadailyrealityformillionsofpeople.Bythefourthedition,in2003,wirelessnetworksandmobilecomputershadbecomeco妹妹onplaceforaccessingtheWebandtheInternet.Now,inthefifthedition,networksareaboutcontentdistribution(especiallyvideosusingCDNsandpeer-to-peernetworks)andmobilephonesaresmallcomputersontheInternet.NewintheFifthEditionAmongthemanychangesinthisbook,themostimportantoneistheadditionofProf.DavidJ.Wetherallasaco-author.Davidbringsarichbackgroundinnetworking,havingcuthisteethdesigningmetropolitan-areanetworksmorethan20yearsago.HehasworkedwiththeInternetandwirelessnetworkseversinceandisaprofessorattheUniversityofWashington,wherehehasbeenteachinganddoingresearchoncomputernetworksandrelatedtopicsforthepastdecade.Ofcourse,thebookalsohasmanychangestokeepupwiththe:ever-changingworldofcomputernetworks.AmongthesearerevisedandnewmaterialonWirelessnetworks(802.12and802.16)The3GnetworksusedbysmartphonesRFIDandsensornetworksContentdistributionusingCDNsPeer-to-peernetworksReal-timemedia(fromstored,streaming,andlivesources)Internettelephony(voiceoverIP)Delay-tolerantnetworks

#ifndefI2C_H#defineI2C_H#definesda(P1.1)#definescl(P1.0)voidi2c_delay(unsignedchari);voidi2c_start(void);voidi2c_stop(void);voidi2c_sendbyte(unsignedcharbyt);unsignedchari2c_waitack(void);unsignedchari2c_receivebyte(void);voidi2c_sendack(unsignedcharackbit);voidwrite_eeprom(unsignedcharadd,unsignedcharval);unsignedcharread_eeprom(unsignedcharadd);voidinit_pcf8591(void);unsignedcharadc_pcf8591(void);#endif

经过判断//成功实现粗略差速intDirmin=257;intDirmax=387;intAccmin=160;intAccmax=885;constintxpin=A1;//x-axisconstStringXHEADER="X:";voidsetup(){//putyoursetupcodehere,torunonce:Serial.begin(9600);pinMode(A1,INPUT);//设置9号口为输出端口:pinMode(A0,INPUT);//设置10号口为输出端口:pinMode(9,OUTPUT);//设置9号口为输出端口:pinMode(10,OUTPUT);//设置10号口为输出端口:}voidloop(){intDir=analogRead(xpin);//Serial.print(XHEADER+analogRead(xpin));//Serial.print(analogRead(A0));//8Serial.println();//putyourmaincodehere,torunrepeatedly:intAcc=analogRead(A0);intAcc_2=map(Acc,Accmin,Accmax,0,255);intDir_2=map(Dir,Dirmin,Dirmax,0,255);//Serial.print(Dir);//Serial.println();if(Dir_2＞=0&&Dir;_2136&&Dir;_2=120){analogWrite(9,Acc_2);analogWrite(10,Acc_2);}delay(300);//延时300毫秒}

在日常工作中，钉钉打卡成了我生活中不可或缺的一部分。然而，有时候这个看似简单的任务却给我带来了不少烦恼。 每天早晚，我总是得牢记打开钉钉应用，点击"工作台"，再找到"考勤打卡"进行签到。有时候因为工作忙碌，会忘记打卡，导致考勤异常，影响当月的工作评价。而且，由于我使用的是苹果手机，有时候系统更新后，钉钉的某些功能会出现异常，使得打卡变得更加麻烦。 另外，我的家人使用的是安卓手机，他们也经常抱怨钉钉打卡的繁琐。尤其是对于那些不太熟悉手机操作的长辈来说，每次打卡都是一次挑战。他们总是担心自己会操作失误，导致打卡失败。 为了解决这些烦恼，我开始思考是否可以通过编写一个全自动化脚本来实现钉钉打卡。经过一段时间的摸索和学习，我终于成功编写出了一个适用于苹果和安卓系统的钉钉打卡脚本。