Ultrasonic sensor is a transducer that converts ultrasonic signal to other energy signals (usually electrical signals). Ultrasonic wave is a mechanical wave with a vibration frequency higher than 20KHz. It has the characteristics of high frequency, short wavelength and small diffraction phenomenon, especially good directional, being able to become a ray and directional propagation. Ultrasound has great penetrating power to liquids and solids, especially in opaque sunlight. When ultrasonic meets impurity or interface, it will produce significant reflection, form reflection to echo, and encounter moving object can produce Doppler effect. Ultrasonic sensors are widely used in industry, national defense, biomedicine and so on.

Filename	Size	Update
ultrasonic120170603\config.h	1234	2014-01-24
ultrasonic120170603\delay.c	1473	2017-01-21
ultrasonic120170603\delay.h	906	2014-01-24
ultrasonic120170603\delay_us.c	565	2017-03-14
ultrasonic120170603\delay_us.h	177	2017-03-14
ultrasonic120170603\Exti.c	2631	2017-01-21
ultrasonic120170603\Exti.h	613	2012-10-22
ultrasonic120170603\GPIO.c	3040	2012-10-23
ultrasonic120170603\GPIO.h	908	2012-10-23
ultrasonic120170603\list\delay.lst	2900	2017-07-11
ultrasonic120170603\list\delay.obj	21053	2017-07-11
ultrasonic120170603\list\GPIO.lst	5772	2017-07-11
ultrasonic120170603\list\GPIO.obj	26859	2017-07-11
ultrasonic120170603\list\main.lst	10599	2017-07-11
ultrasonic120170603\list\main.obj	32604	2017-07-11
ultrasonic120170603\list\UART1.plg	607	2017-06-28
ultrasonic120170603\list\ultrasonic	111230	2017-07-11
ultrasonic120170603\list\ultrasonic.hex	5758	2017-07-11
ultrasonic120170603\list\ultrasonic.lnp	154	2017-07-11
ultrasonic120170603\list\ultrasonic.m51	23960	2017-07-11
ultrasonic120170603\list\ultrasonic.plg	630	2017-07-11
ultrasonic120170603\list\USART1.lst	12060	2017-07-11
ultrasonic120170603\list\USART1.obj	33173	2017-07-11
ultrasonic120170603\main.c	5693	2017-06-19
ultrasonic120170603\readme	540	2017-06-27
ultrasonic120170603\STC15Fxxxx.H	33589	2014-01-24
ultrasonic120170603\timer.c	3470	2017-02-08
ultrasonic120170603\timer.h	894	2012-10-22
ultrasonic120170603\ultrasonic.c	2142	2017-01-21
ultrasonic120170603\ultrasonic.h	395	2017-01-21
ultrasonic120170603\ultrasonic.uvopt	56786	2017-07-11
ultrasonic120170603\ultrasonic.uvproj	13889	2017-06-28
ultrasonic120170603\ultrasonic_uvopt.bak	56205	2017-06-28
ultrasonic120170603\ultrasonic_uvproj.bak	13885	2017-04-07
ultrasonic120170603\USART1.C	5126	2017-06-27
ultrasonic120170603\USART1.h	3002	2014-01-24
ultrasonic120170603\list	0	2017-07-11
ultrasonic120170603	0	2017-07-11

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