Ultrasonic Rangers

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neo_matrix671

New Member

• Sep 4, 2009

• #1

hi,i'm working on project which avoids accident between two cars,for that purpose i'm measuring distance between two moving cars,
to measure distance i'm using ultrasonic ranger

SRF01 Ultrasonic range finder

i want to know that will this ultrasonic ranger work properly,please help...

 

ericgibbs

Well-Known Member

Most Helpful Member

• Sep 4, 2009

• #2

neo_matrix671 said:

hi,i'm working on project which avoids accident between two cars,for that purpose i'm measuring distance between two moving cars,
to measure distance i'm using ultrasonic ranger

SRF01 Ultrasonic range finder

i want to know that will this ultrasonic ranger work properly,please help...

Click to expand...

hi,
Looking at the datasheet, I cannot find the TX power or any indication of possible ranges.???

The problem that you have is that ultrasound is subject wind conditions.!

EDIT:
I found this on the web.
**broken link removed**

On moving cars its possible that the US beam will get blown away.

 

Last edited: Sep 4, 2009

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kpatz

New Member

• Sep 4, 2009

• #3

The range on one of those rangefinders will be too short, they measure on the order of inches or maybe a couple feet. Also, the wind noise outside a car at speed will drown out the ultrasonic pings, reducing its range further.

It might warn you a few milliseconds before you hit the other car though...

 

audioguru

Well-Known Member

Most Helpful Member

• Sep 4, 2009

• #4

The wind pressure will stop the transducer from working and might even damage it.
The wind noise will be much too high anyway.
Stick your head outside a moving car to hear what it sounds like.

It might pick up the reflection from the rear of a truck or bus but have a very short range with the tiny reflection from the rear of a streamlined car.

 

birdman0_o

Active Member

• Sep 4, 2009

• #5

18cm (7 inches) to 600cm (19ft)
That would be a close call unless your driving at VERY slow speeds.

 

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neo_matrix671

New Member

• Sep 5, 2009

• #6

so,can i use infrared ranger,
Sharp GP2Y0A700K0F Package

 

birdman0_o

Active Member

• Sep 17, 2009

• #7

Max distance says 5m, you won't be able to prevent any accidents with that, maybe you could make a reverse driving indicator the beeps when your about to hit something?

This is not an easy project!

 

audioguru

Well-Known Member

Most Helpful Member

• Sep 17, 2009

• #8

A 5m range is pretty far for tiny toy cars.

 

birdman0_o

Active Member

• Sep 17, 2009

• #9

audioguru said:

A 5m range is pretty far for tiny toy cars.

Click to expand...

Is he talking about a toy car or a real car? He didn't specify.
Above you said real car and mentioned how the air flow would mess up the UF system.

 

audioguru

Well-Known Member

Most Helpful Member

• Sep 17, 2009

• #10

Without looking at the limited range spec's for ultrasonic transducers and ignoring wind noise, he is designing a collision avoidance circuit for real cars.