Question 1

The ultrasonic sensor i bought only reads up to 50cm, what can i do to increase the range? i've tried every arduino example

Accepted Answer

I don't know what to suggest. The spec says up to 5 meters and although I didn't try at that range I did try at about 10 feet and it was fine.Dodgy sensor perhaps?

Question 2

Can i hear ultrasonic sound with these ?

Accepted Answer

Do you mean can you hear the 40 KHz ultrasound emitted by the unit, then the answer is no. As others here have said, it is above the normal hearing range of a person. Twice as high over a young person and about four times as high as I, an older person can hear. (I blame discos and over powerful ear phones!)

If you mean, can you use the device as a microphone to pick up ultra sound, like perhaps a bat's hunting sound, then as the unit stands, again no. One of the transducers emits a 40 KHz sound that is reflected off an object and picked up by the other transducer. There are three ICs on the board to make this happen, but they get in the way of connecting the transducers up to say an amplifier. The purpose of the whole device as you probably know is to use ultrasound to measure distances and that is pretty much all it can do when used with an Arduino or similar microcomputer.

However, if you were to remove the transducers from the board you would be able to connect them up to something like an oscilloscope and see the display of any ultrasound around the operating frequency of the transducers. The problem is that they are tuned to work at about 40KHz and don't work very well below 39KHz or above 41KHz.

So a lot of problems in getting them to work as ultrasonic microphones.

Question 3

Will this work with an Mbed?

Accepted Answer

Yes

Question 4

Will this work with a Raspberry Pi?

Accepted Answer

Yes but you'll need female to female jumper wire or some type of breakout board for the raspberry pi

ASIN	B0066X9V5K
Batteries are Included	No
Best Sellers Rank	62,394 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 17 in Ultrasonic Proximity Sensors
Brand Name	super9shop
Colour	A1501
Country Of Origin	India
Customer Reviews	4.5 4.5 out of 5 stars (51)
International Protection Rating	IP54
Item Weight	0.01 Ounces
Manufacturer	super9shop
Manufacturer Part Number	HC-SR04
Material Type	Acrylonitrile Butadiene Styrene
Measuring Range	2cm-500cm
Model Number	HC-SR04
Number of Items	1
Number of Packs	1
Sport Type	Archery
UPC	609224531682
Water Resistance Level	Water Resistant

SB COMPONENTS HC-SR04 Ultrasonic Distance Rangefinder Sensor with Obstacle Detection Module and obstacle avoiding systems on Raspberry Pi robots or rovers!

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