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Thread: Circuit for Ultrasonic (Parking) Sensor

  1. #11
    Variable Bitrate Nerd2's Avatar
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    Cool

    Hi again all,
    If anyone's interested, i've started using ultrasonic rangers from http://www.robot-electronics.co.uk/

    Their bottom of the line ultrasonic sensor, the SRF02, combined with a USBI2C creates a quick and easy distance sensor.

    I haven't actually thought about how to mount the things in the car yet, but i've bought 2 and they're set up fine, quick VB app attached (mondeo pic copyright ford ;-) ).

    You could have an USBI2C with every sensor, which would mean 4-sensors for 120.The SRF02 runs on the I2C bus, which i've been told I shouldn't extend more than ~2metres. The obvious plan would then be to have one USBI2C for the back bumper, and one for the front, with a total price of 80. I'm currently experimentally considering if a 'spider' arrangement, with the USBI2C in the center of the car, leading out to the four sensors, would allow me to reduce the price to about 65.

    It could maybe be done cheaper by soldering it yoursef, and I wouldn't call it cheap, but i think 65 for a 4-sensor system is a pretty good deal, up to 90 for 6 sensors.

    The only major flaw with these at the moment, is that they arn't waterproof. So, next work is to research trying to cover these as best as possible. Apparently just replacing the transeiver with a waterproof type doesn't work for some reason.

    Comments appreciated.

    Sam
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  2. #12
    FLAC Griff1's Avatar
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    Quote Originally Posted by Nerd2 View Post
    Hi again all,
    If anyone's interested, i've started using ultrasonic rangers from http://www.robot-electronics.co.uk/

    Their bottom of the line ultrasonic sensor, the SRF02, combined with a USBI2C creates a quick and easy distance sensor.

    I haven't actually thought about how to mount the things in the car yet, but i've bought 2 and they're set up fine, quick VB app attached (mondeo pic copyright ford ;-) ).

    You could have an USBI2C with every sensor, which would mean 4-sensors for 120.The SRF02 runs on the I2C bus, which i've been told I shouldn't extend more than ~2metres. The obvious plan would then be to have one USBI2C for the back bumper, and one for the front, with a total price of 80. I'm currently experimentally considering if a 'spider' arrangement, with the USBI2C in the center of the car, leading out to the four sensors, would allow me to reduce the price to about 65.

    It could maybe be done cheaper by soldering it yoursef, and I wouldn't call it cheap, but i think 65 for a 4-sensor system is a pretty good deal, up to 90 for 6 sensors.

    The only major flaw with these at the moment, is that they arn't waterproof. So, next work is to research trying to cover these as best as possible. Apparently just replacing the transeiver with a waterproof type doesn't work for some reason.

    Comments appreciated.

    Sam
    Hi,
    How are you getting on,are you still workin on this??

    If not is there any chance you could share the source in the hope someone might continue the project?
    P4 2.8 HT, 512Mb Ram, 60Gb 2.5 HD, M4-ATX, SB Audigy2, BU353, Lilliput TS,Soundgraph Imon VFD,SONY Optiarc dvd Burner,RideRunner, iGo8, Custom Freedom 2.1

  3. #13
    Variable Bitrate Nerd2's Avatar
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    Haven't bothered with these for a while. There isn't really much source to work with - I just followed the instructions and sent data using MsComm in VB. Don't have the source with me anyway, if anyone wants it then I can send it next week.

  4. #14
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    ah, I thought about doing something like this....







    for about 1 minute......












    then it hit me......









    cheaper, easier & better........









    USE A CAMERA!!!!!!








    in the end, it's the best way to go, if you can set up the display to auto switch in reverse your golden..... forget the beep beep beep beeeeeep boom....

  5. #15
    Newbie Nicklooi's Avatar
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    Smile Ultransonic range detector

    hi all,

    Does any 1 noe how to construct a simple ultrasonic range detector circuit ???
    can teach me or give me some guide.... Basically I dnno much about Ultrasonic sensor also....but i hope to construct 1 in 1month time.. i had try 1 like the picture i attach... for IC4 RX i had change to LM833N, this is because i can't buy it in market on NJM4580D....
    any 1 have any idea??? or other circuit might help ???
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  6. #16
    Fusion Brain Creator 2k1Toaster's Avatar
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    I have built that exact circuit before. Very very finicky. I was learning about ultrasonics, and I am not sure why, but all I got was rail to rail bouncing. Easiest way is to use a PIC to measure the time span between output pulse and received pulse. If you need to design and build in 1 month (sort of like when the school semester ends...) then you should start designing now because a ripoff of a circuit will teach you nothing.
    Fusion Brain Version 6 Released!
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  7. #17
    Newbie Nicklooi's Avatar
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    Quote Originally Posted by 2k1Toaster View Post
    I have built that exact circuit before. Very very finicky. I was learning about ultrasonics, and I am not sure why, but all I got was rail to rail bouncing. Easiest way is to use a PIC to measure the time span between output pulse and received pulse. If you need to design and build in 1 month (sort of like when the school semester ends...) then you should start designing now because a ripoff of a circuit will teach you nothing.
    yup m start from a simple circuit now d... may i ask u something ... how if i dn wan using 555 time to generate 40KH can i replace with cistal ?? and how i noe the ultrasonic tx or Rx hv function ??? cause i din deal with any type of sensor before... This is my 1st time...

  8. #18
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    @2k1Toaster can give me the pcb draw?please
    Under construct: Dell Optiplex GX 150

  9. #19
    Newbie Nicklooi's Avatar
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    Need help from all expert,
    what is the voltage that come out from a ultrasonic Rx (400PT160)???
    Below is my Rx circuit, if the Vout = 5V , mean that the U-sensor Echo is receive from the U-sensor. How to I gonna to prove that my circuit it correct ???
    My Tx frequency is 40 kHz. 12V

    Please help...!!! Urgent...

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