Page 1 of 3 123 LastLast
Results 1 to 10 of 21

Thread: Seat belt warning system for rear seats - for safety precautions - how can i do this?

  1. #1
    Low Bitrate
    Join Date
    Apr 2009
    Location
    At home
    Posts
    88

    Seat belt warning system for rear seats - for safety precautions - how can i do this?

    Well guys i need to know how can i achieve these:

    i would like to have a seat belt warning system for my rear seats....ok ok ok...its not that i like the warning sounds from those systems but i really need these for safety reasons for my rear passengers....they are too younger....and know how to remove the seat belt.....so i need to monitor that thing....

    So i guess i would just want to make a scheme like this:

    - using a sensor (dont know which one....is it really needed a sensor or another thing ?...i guess pressure and force sensor....or other one...) on the lower belt part and then using some kind of led light or speaker to check if seat belt is being used or not, just need to know when seat belt is on or off, there is no need for more than this.
    I would put that warning speaker or led light on dash and would know when someone removes the seat belt just by listening or looking at that warning!

    How would be this circuitry...i mean....for example a led would lit when the sensor is activated and would need to get power from my battery (i have some 12 volts sockets on my car already installed) or using another kind of power supply ?

    How can i achieve this guys ? Its a safety matter more than another thing and i guess its worth the effort i can put to do it

    Thanks

  2. #2
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    after you said young ones, i completley understood

    i have always wondered if some cars use a optical sensor, or a momentary switch inside the buckle latch-- 'i think' that most of them use a switch inside the latch... so if they did, and i were to setup a system like this for myself:

    as long as the seatbelts bolt to the metal, and you do not need to modify the belt latch(modifying the latch, or it attachment method in any way could possibly hurt the integrity of it--which would be just as bad as not using the belt...), or any of its parts to make it work, i would use some similar mouting belt latches from the drivers seat of some junkyard cars, and would wire the switches to the switched power from behind the radio, and hook each latch up to a LED on the front panel, so that anytime the car is on, and the seatbelts are not connected, the light will be on.

  3. #3
    Low Bitrate
    Join Date
    Apr 2009
    Location
    At home
    Posts
    88
    Quote Originally Posted by soundman98 View Post
    after you said young ones, i completley understood

    i have always wondered if some cars use a optical sensor, or a momentary switch inside the buckle latch-- 'i think' that most of them use a switch inside the latch... so if they did, and i were to setup a system like this for myself:

    as long as the seatbelts bolt to the metal, and you do not need to modify the belt latch(modifying the latch, or it attachment method in any way could possibly hurt the integrity of it--which would be just as bad as not using the belt...), or any of its parts to make it work, i would use some similar mouting belt latches from the drivers seat of some junkyard cars, and would wire the switches to the switched power from behind the radio, and hook each latch up to a LED on the front panel, so that anytime the car is on, and the seatbelts are not connected, the light will be on.
    Thanks!
    Of course i dont wanna put safety in risk when making these. So i dont wanna interfere with the seat belt/latch, just wondering if its possible to do this on the lower part of the lower belt since its there that the seat belt will go.

  4. #4
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    i know all cars are different, and i have seen seatbelt latch styles vary with where they are located in the car, so i can't be 100% confident that you will be able to make it work in your, or any car, but if your belt latches are all the same all around the car, and if your belts easily bolt to the floor, and if your latch uses a switch instead of a optical sensor, it should work.

    thats a lot of 'if's'...

  5. #5
    Low Bitrate
    Join Date
    Apr 2009
    Location
    At home
    Posts
    88
    Quote Originally Posted by soundman98 View Post
    i know all cars are different, and i have seen seatbelt latch styles vary with where they are located in the car, so i can't be 100% confident that you will be able to make it work in your, or any car, but if your belt latches are all the same all around the car, and if your belts easily bolt to the floor, and if your latch uses a switch instead of a optical sensor, it should work.

    thats a lot of 'if's'...
    the front seat belts are different from rear seat blets and so are the lower belts.

    Optical sensors as a mouse has got ??? I mean like the ones we have in our pc mouses???

  6. #6
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118
    FYI - I was amused when I saw how Volvo did their "people in seat" sensing way back last millennium.... A simple spring switch (contacts) that pulled apart under the seat (maybe technically referred to as an R-Grav switch - ie, As the R's hit the seat, gravity pulls it further down....?? LOL)

    To think that I was working with people that were using radiation detectors to detect people! (about 300 counts per minute as I recall.)

  7. #7
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    if the front belt attachments are different than the rears, then i don't know if it would be possible in your car-- you could try it, but any way that i can try to explain it is going to sound like i am recommending you hack up the latch, which could lead to it failing in a crash.

    i am thinking of a optical proximity type sensor like this-- http://parts.digikey.com/1/parts/946...a0902-011.html.

    i really don't know if any seat belts really use them, but i wouldn't doubt it...

  8. #8
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118
    I think there have been various systems including continuity, Hall, interruption (photo, reed & Hall), microswitch...

    Normally I'd also go for a photo-interruptor, but dirt would be a issue.
    I'd suspect they use a magnetic system for reliability - maybe a reed, possibly a Hall.


    I'd probably set up a cross-belt continuity system that if broken whilst the engine is on or vehicle moving, enables an oscillator connected to a Tesla coil across the belt. Whilst often producing an audible alert when activated, it is also a good deterrent - er, um... preventative system - users soon learn when NOT to unbelt themselves (it's my job to do the belting!).

  9. #9
    Low Bitrate
    Join Date
    Apr 2009
    Location
    At home
    Posts
    88
    It seems there are a lot of options and of course i dont wanna put safety in risk so i will go for an option that doesnt interfere with safety concerns so i guess your ideas may have some choice to live! I was thinking in fact in some kind of sensor that would be activated upon belt being used or something near that !

  10. #10
    Low Bitrate majasticmoose's Avatar
    Join Date
    Dec 2009
    Posts
    57
    Or the simple approach, solder a wire to the buckle, duct tape the wire up the belt so it goes into to car. Solder a wire to the latch. when the metal buckle hits the latch, it completes a circuit shutting off or turning on an LED up front.

Page 1 of 3 123 LastLast

Similar Threads

  1. Virtual Earth cache builder? Or even gps simulator to make it cache?
    By thepunkerguy in forum DigitalMods (Scripts / API)
    Replies: 183
    Last Post: 08-28-2008, 08:58 PM
  2. pc reboot on sd startup
    By duanes7 in forum StreetDeck
    Replies: 3
    Last Post: 12-14-2007, 08:55 AM
  3. Holux GPS Trouble
    By mangus580 in forum StreetDeck
    Replies: 34
    Last Post: 11-26-2007, 08:56 PM
  4. airbag Warning light came on after installing an alarm system!!
    By ilyassx in forum Engine Management, OBD-II, Engine Diagnostics, etc.
    Replies: 10
    Last Post: 10-10-2007, 10:36 AM
  5. Indexing music in 1.0.9.8 Failed
    By hovalistic in forum StreetDeck
    Replies: 0
    Last Post: 07-07-2007, 11:19 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •