本帖最后由 MicroMaker 于 2017-5-14 09:32 编辑
这个盒子可以不用按按钮就可以发出美妙的音乐。只要将手放在盒子上上下摆舞几下,你的耳朵里就会响起优美的音符,随着优美的音符响起,发出迷幻的光线,好像一个看不到底的时空隧道。 它的原理是:打开开关,将手放置于超声波传感器上方,如果探测到在一个范围内,喇叭就发出一个音调;探测到在另一个范围内,喇叭就会发出另一个音调。同时,不同的LED发出不同的色彩。光线在镜子与单透膜之间无限反射,形成无数个影子。
整个小制作,分成五个部分: 第一部分: 先用超声波传感器测量超声波碰到手再返回的时间。 第二部分: 由主芯片发出不同频率的脉冲,使喇叭发出各种各样的音调。 音符(共11个):a3;b3;c4;d4;e4;f4;g4;a4;b4;c5;d5; 第三部分: 利用不同的RGB颜色配比,形成由30个LED组成的光带,用一面镜子做底板,单透膜作为面板,LED光带放在镜子和单透膜之间,光线在镜子和单透膜之间无限反射,形成许多光带的影子。 第四部分: Arduino主芯片收到信息后,用公式计算出手与传感器之间的距离(公式:距离=时间*音速(340米/秒)/2)。按照不同的距离,主芯片命令发出不同的音乐、不同的LED发出不同的光。比如:距离为130mm,喇叭发出la(c),第1、2、3、27、28、29号LED点亮。 第五部分:开发系统、开发板 本小制作采用了Arduino UNO开发板 主控芯片:ATMEGA 328p 编程软件为Arduino IDE 编程语言:C/C++
主要元件目录表: 1.Arduino uno主板(1块) 2.us-100超声波模块(1块) 3.喇叭(1只) 4.30个LED组成的光环(1条) 5.11.1V电池组(1块) 6.电源降压模块(1块) 7.发光按钮开关(1个) 8.镜子(1面) 9.有机玻璃外壳(外贴单透膜)
超声波传感器 Arduino Uno单片机 喇叭 LED光带、镜子 单透膜 有机玻璃外壳 组装过程: 组装(1) 组装(2)
组装(3) 组装(4) 我去年用这个作品还获得过绍兴市第二季校园科学达人的称号呢! 作品程序: [mw_shl_code=cpp,true]#include <Adafruit_NeoPixel.h> //彩色LED库
# define PIN 6 //设置LED端口
# define MAX_LED 30 //特定的程序,最后一个数字是LED光带中LED的数量
Adafruit_NeoPixel strip = Adafruit_NeoPixel( MAX_LED, PIN, NEO_RGB + NEO_KHZ800 ); //彩色LED库的内部设置
int a = 2;// 将Arduino 的Pin2 连接至US-100 的Echo/RX
int b = 3;// 将Arduino 的Pin3 连接至US-100 的Trig/TX
void setup() {
pinMode(a,INPUT);// 设置a 为输入模式。
pinMode(b,OUTPUT);// 设置b 为输出模式。
strip.begin(); //启动LED函数库
strip.show(); //将所有的LED灯灭掉
}
void loop() {
long c = 0;//脉冲时间
long d = 0;//脉冲距离
// 通过Trig/Pin 发送脉冲,触发US-100 测距
digitalWrite(b,LOW); // 先拉低,以确保脉冲识别正确
delayMicroseconds(2);// 等待2us
digitalWrite(b,HIGH);// 开始通过Trig/Pin 发送脉冲
delayMicroseconds(12);// 设置脉冲宽度为12us (>10us)
digitalWrite(b,LOW);// 结束脉冲
c = pulseIn(a,HIGH);// 计算US-100 返回的脉冲时间
d = c*0.34/2; //距离=脉冲时间*声波的速度(340/s)/2
if(d>50&&d<=150) //当脉冲距离>50mm并且<=150的时候,执行以下程序
{
ala(); //喇叭发出a3的音调
ledz(); //使所有LED灯灭
leda(); //使1.2.3.27.28.29盏LED灯亮
}
if(d>150&&d<=200)
{
asi();
ledz();
ledb();
}
if(d>200&&d<=250)
{
bdo();
ledz();
ledc();
}
if(d>250&&d<=300)
{
bre();
ledz();
ledd();
}
if(d>300&&d<=350)
{
bmi();
ledz();
lede();
}
if(d>350&&d<=400)
{
bfa();
ledz();
ledf();
}
if(d>400&&d<=450)
{
bso();
ledz();
ledg();
}
if(d>450&&d<=500)
{
bla();
ledz();
ledh();
}
if(d>500&&d<=550)
{
bsi();
ledz();
ledi();
}
if(d>550&&d<=600)
{
cdo();
ledz();
ledj();
}
if(d>600&&d<=800)
{
cre();
ledz();
ledk();
}
if(d<=50)
{
noTone(9);
ledz();
ledy();
}
if(d>800)
{
noTone(9);
ledz();
ledy();
}
delay(400);// 每秒测量2.5次
}
void ala() //设置一个函数:以后想要使用{ }里的程序的话,可以直接打函数名,如:ala
{
tone(9,440); //声音函数(LED端口,频率).发出a3的音调
}
void asi()
{
tone(9,493); //发出b3的音调
}
void bdo()
{
tone(9,523); //发出c4的音调
}
void bre()
{
tone(9,587); //发出d4的音调
}
void bmi()
{
tone(9,659); //发出e4的音调
}
void bfa()
{
tone(9,698); //发出f4的音调
}
void bso()
{
tone(9,784); //发出g4的音调
}
void bla()
{
tone(9,880); //发出a4的音调
}
void bsi()
{
tone(9,988); //发出b4的音调
}
void cdo()
{
tone(9,1046); //发出c5的音调
}
void cre()
{
tone(9,1175); //发出d5的音调
}
void ledj()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small yellow
uint32_t r = strip.Color(25,25,0); //small small yellow
//设置LED发出的颜色
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(7, f);
strip.setPixelColor(8, g);
strip.setPixelColor(9, h);
strip.setPixelColor(10, i);
strip.setPixelColor(11, j);
strip.setPixelColor(18, j);
strip.setPixelColor(19, i);
strip.setPixelColor(20, h);
strip.setPixelColor(21, g);
strip.setPixelColor(22, f);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o );
strip.show();
}
void ledi()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(7, f);
strip.setPixelColor(8, g);
strip.setPixelColor(9, h);
strip.setPixelColor(10, i);
strip.setPixelColor(19, i);
strip.setPixelColor(20, h);
strip.setPixelColor(21, g);
strip.setPixelColor(22, f);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledh()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(7, f);
strip.setPixelColor(8, g);
strip.setPixelColor(9, h);
strip.setPixelColor(20, h);
strip.setPixelColor(21, g);
strip.setPixelColor(22, f);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledg()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(7, f);
strip.setPixelColor(8, g);
strip.setPixelColor(21, g);
strip.setPixelColor(22, f);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledf()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(7, f);
strip.setPixelColor(22, f);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void lede()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledd()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledc()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
strip.show();
}
void ledb()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void leda()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledk()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(29, p);
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(2, a);
strip.setPixelColor(3, b);
strip.setPixelColor(4, m);
strip.setPixelColor(5, n);
strip.setPixelColor(6, e);
strip.setPixelColor(7, f);
strip.setPixelColor(8, g);
strip.setPixelColor(9, h);
strip.setPixelColor(10, i);
strip.setPixelColor(11, j);
strip.setPixelColor(12, k);
strip.setPixelColor(13, q);
strip.setPixelColor(14, r);
strip.setPixelColor(15, r);
strip.setPixelColor(16, q);
strip.setPixelColor(17, k);
strip.setPixelColor(18, j);
strip.setPixelColor(19, i);
strip.setPixelColor(20, h);
strip.setPixelColor(21, g);
strip.setPixelColor(22, f);
strip.setPixelColor(23, e);
strip.setPixelColor(24, n);
strip.setPixelColor(25, m);
strip.setPixelColor(26, b);
strip.setPixelColor(27, a);
strip.setPixelColor(28, o);
strip.show();
}
void ledy()
{
//颜色变量设置:
uint32_t a = strip.Color(191,0,255); //blue
uint32_t b = strip.Color(112,218,214); //small purple
uint32_t m = strip.Color(0,120,0); //red
uint32_t n = strip.Color(69,255,0); //orange
uint32_t e = strip.Color(255,255,0); //yellow
uint32_t f = strip.Color(139,34,34); //green
uint32_t g = strip.Color(255,0,255); //green or blue
uint32_t h = strip.Color(0,0,255); //blue
uint32_t i = strip.Color(0,128,128); //purple
uint32_t j = strip.Color(0,255,0); //big red
uint32_t k = strip.Color(165,255,0); //big orange
uint32_t o = strip.Color(111,0,175); //small blue
uint32_t p = strip.Color(31,0,95); //small small blue
uint32_t q = strip.Color(85,85,0); //small blue
uint32_t r = strip.Color(25,25,0); //small small blue
strip.setPixelColor(0, p);
strip.setPixelColor(1, o);
strip.setPixelColor(28, o);
strip.setPixelColor(29, p);
strip.show();
}
void ledz()
{
//颜色变量设置:
uint32_t u = strip.Color(0,0,0); //black
strip.setPixelColor(0, u);
strip.setPixelColor(1, u);
strip.setPixelColor(2, u);
strip.setPixelColor(3, u);
strip.setPixelColor(4, u);
strip.setPixelColor(5, u);
strip.setPixelColor(6, u);
strip.setPixelColor(7, u);
strip.setPixelColor(8, u);
strip.setPixelColor(9, u);
strip.setPixelColor(10, u);
strip.setPixelColor(11, u);
strip.setPixelColor(12, u);
strip.setPixelColor(13, u);
strip.setPixelColor(14, u);
strip.setPixelColor(15, u);
strip.setPixelColor(16, u);
strip.setPixelColor(17, u);
strip.setPixelColor(18, u);
strip.setPixelColor(19, u);
strip.setPixelColor(20, u);
strip.setPixelColor(21, u);
strip.setPixelColor(22, u);
strip.setPixelColor(23, u);
strip.setPixelColor(24, u);
strip.setPixelColor(25, u);
strip.setPixelColor(26, u);
strip.setPixelColor(27, u);
strip.setPixelColor(28, u);
strip.setPixelColor(29, u);
}
/*
距离计算公式:
声波的速度=1秒340米
1秒=1000000微秒
1微秒=0.000001秒
1微秒声波的距离=340米*0.000001秒=0.00034米
c微秒声波的距离=c*0.00034米
1米=1000毫米
c微秒声波的距离=c*0.34毫米
声波往返1次
实际距离=c*0.34毫米/2
*/[/mw_shl_code]
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