New Ultrasonic Range Sensor

All, I have been working on an ultrasonic sensor since 1994. About two years ago I decided to package the sensor for everyone. (I must say that my wife has been unhappy with the money and time I spent!) It is avaible now. Data sheet is avaiable at the web site.

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The MaxSonar-EZ1: is very low cost, uses just one trasnducer, detects to zero (yes even pressing against the front face), detects to 254 inches (6.45 meters), is the smallest size (smallest PCB & includes mounting holes), is the lowest power (just 2 mA typical at 5V), has a controlled narrow long-range beam,

has a very easy user interface including RS232C, pulse width, and analog votlage.

I posted this because this really is a break through product and I would have wanted one in 1997.

Reply to
Bob (Robot Wars Thumper 1997)
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How stable is the return from a liquid surface?

Jerry

Reply to
Jerry Avins

The sensor will provide a stable result from a stable liquid surface.

Reply to
Bob (Robot Wars Thumper 1997)

What's the beamwidth/polar pattern (in degrees) of your sensor? - most industrial ultrasonics have quite a wide cone of "view". I too am interested in liquid surface measuring - but I want to measure wave-height in moving water and have come unstuck with ultrasonic before now.

Dave Slee Engineering Specialist The New and Renewable Energy Centre

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Reply to
Dave Slee

Dave, The beamwidth is somewhat dependent upon target size. The sensor is designed for indoor robotics use. The datasheet shows the detection zone for a 1/4 inch pole, a 1 inch pole, a 3.25 inch pole, and a board. The data sheet does not have water listed but I am sure that the sensor would detect the water surface.

The data sheet is located here:

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The larger more expensive 2-inch transducers have a natural beam width of about 15 degrees.

The small transducers that I use, do not have a naturally narrow beam but the beam width must be controlled with gain verses distance. The gain on the MaxSonar-EZ1 can have hundereds of steps. In addition, becasue of this, the MaxSonar-EZ1 effectively does not have side lobes that are typical with this type of sensor, and the beam width is very narrow. The beam width is the effective beam width, not the natural beam width. Some of this is explained in the FAQ section of the website.

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Bob Gross
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Reply to
Bob (Robot Wars Thumper 1997)

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