So, now we know that the object is 8.5 centimeters away from the sensor. Anyway, with that information, we can calculate the distance!īut this is not done! Remember that the pulse indicates the time it took for the signal to be sent out and reflected back so to get the distance so, you’ll need to divide your result in half. You could do the math, but searching it is easier. A quick Google search for “speed of sound in centimeters per microsecond” will say that it is 0.034 cm/µs. We have to convert the speed of sound into cm/µs in order to calculate the distance. What speed do we have? The speed of sound, of course! Its 340 m/s. Now let’s calculate how far the object from the sensor is. Suppose we have an object in front of the sensor at an unknown distance and we received a pulse of width 500 µS on the Echo pin. Let’s take an example to make it more clear.
Thus a 38 mS pulse indicates no obstruction within the range of the sensor. In case, If those pulses are not reflected back then the Echo signal will timeout after 38 mS (38 milliseconds) and return low. Meanwhile the Echo pin goes HIGH to start forming the beginning of the echo-back signal. The eight ultrasonic pulses travel through the air away from the transmitter. This 8-pulse pattern makes the “ultrasonic signature” from the device unique, allowing the receiver to differentiate the transmitted pattern from the ambient ultrasonic noise. In response to that the sensor transmits a sonic burst of eight pulses at 40 KHz. It all starts, when a pulse of at least 10 µS (10 microseconds) in duration is applied to the Trigger pin. How Does HC-SR04 Ultrasonic Distance Sensor Work? GND should be connected to the ground of Arduino. The length of the pulse is proportional to the time it took for the transmitted signal to be detected. Trig (Trigger) pin is used to trigger the ultrasonic sound pulses.Įcho pin produces a pulse when the reflected signal is received. Get Aimersoft DVD Ripper and rip DVD to all popular video formats for playback on iPhone, iPad, iPod, Zen, Archos, etc.VCC is the power supply for HC-SR04 Ultrasonic distance sensor which we connect the 5V pin on the Arduino.
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Tips about DVD burning, DVD copying and DVD rippingġ. Note that DVD-18 is not supported by DVD-R/W and DVD+R/W. This double sided dual layer DVD can contain up to 17 GB or 15.9 computer GB and the same as DVD-9, widely used by some commercial video DVDs. Well, DVD-10 is a double sided single layer DVD which can store about 9.4 GB or 8.7 computer GB and is supported by Video DVD, DVD-R/W and DVD+R/W.ĭVD-18: DVD-18 is two-sided discs that holds DVD-9 disc on both sides of it. It is often used as the marketing term for dual layer DVD-R and DVD+R discs.Īfter knowing the general information about DVD-5 and DVD-9, if you have interest, you can explore the differences between DVD-5 and DVD9.ĭVD-10: From the name, we can know that DVD-10 is a dual-sided DVD-5. It is widely used by commercial video DVDs. Video DVD, DVD-R/W and DVD+R/W support DVD-5 well.ĭVD-9: DVD-9 is a single-sided dual-layer DVD disc that can contain up to 8.5 GB or 7.95 computer GB. Now let's have a look at these different DVD sizes.ĭVD-5: DVD-5 is a single sided single layer disc that can store up to about 4.7 GB = 4 700 000 000 bytes and that is 4.38 computer GigaBytes of data on it. Generally, there are four popular DVD sizes: DVD-5, DVD-9, DVD-10 and DVD-18. Compared to CD, DVD offers higher storage capacity with the same dimensions and is widely used by people to store data and information nowadays. DVD is an optical disc storage media format.