#include?“SR04.h“

SR04::SR04（int?echoPin?int?triggerPin）?{
????_echoPin?=?echoPin;
????_triggerPin?=?triggerPin;
????pinMode（_echoPin?INPUT）;
????pinMode（_triggerPin?OUTPUT）;
????_autoMode?=?false;
????_distance?=?999;
}


long?SR04::Distance（）?{
????long?d?=?0;
????_duration?=?0;
????digitalWrite（_triggerPin?LOW）;
????delayMicroseconds（2）;
????digitalWrite（_triggerPin?HIGH）;
????delayMicroseconds（10）;
????digitalWrite（_triggerPin?LOW）;
????delayMicroseconds（2）;
????_duration?=?pulseIn（_echoPin?HIGH?PULSE_TIMEOUT）;
????d?=?MicrosecondsToCentimeter（_duration）;
????delay（25）;
????return?d;
}

long?SR04::DistanceAvg（int?wait?int?count）?{
????long?min?max?avg?d;
????min?=?999;
????max?=?0;
????avg?=?d?=?0;

????if?（wait?????????wait?=?25;
????}

????if?（count?????????count?=?1;
????}

????for?（int?x?=?0;?x?????????d?=?Distance（）;

????????if?（d?????????????min?=?d;
????????}

????????if?（d?>?max）?{
????????????max?=?d;
????????}

????????avg?+=?d;
????}

????//?substract?highest?and?lowest?value
????avg?-=?（max?+?min）;
????//?calculate?average
????avg?/=?count;
????return?avg;
}

void?SR04::Ping（）?{
????_distance?=?Distance（）;
}

long?SR04::getDistance（）?{
????return?_distance;
}

long?SR04::MicrosecondsToCentimeter（long?duration）?{
????long?d?=?（duration?*?100）?/?5882;
????//d?=?（d?==?0）?999:d;
????return?d;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-04-15?19:49??超聲波\
?????目錄???????????0??2012-04-21?09:26??超聲波\examples\
?????目錄???????????0??2012-04-21?10:06??超聲波\examples\SR04_Example\
?????文件?????????336??2012-04-21?10:35??超聲波\examples\SR04_Example\SR04_Example.ino
?????文件?????????719??2012-02-26?02:41??超聲波\keywords.txt
?????文件?????????151??2012-04-21?10:42??超聲波\Readme.txt
?????文件????????1391??2012-02-26?02:41??超聲波\SR04.cpp
?????文件????????2024??2012-02-26?02:41??超聲波\SR04.h