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

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  • 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
    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.
    My OLD 2001 Mitsubishi Eclipse GT:
    "The Project That Never Ended, until it did"


    next project? subaru brz
    carpc undecided

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    • #3
      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.

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      • #4
        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'...
        My OLD 2001 Mitsubishi Eclipse GT:
        "The Project That Never Ended, until it did"


        next project? subaru brz
        carpc undecided

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        • #5
          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???

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          • #6
            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.)

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            • #7
              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...
              My OLD 2001 Mitsubishi Eclipse GT:
              "The Project That Never Ended, until it did"


              next project? subaru brz
              carpc undecided

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              • #8
                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!).

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                • #9
                  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 !

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                  • #10
                    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.

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                    • #11
                      is this a pull type buckle? or a in seat that doesn't retract. I'd think for the ones that retract at least you could use a switch that measures the size of the "roll" and once it gets low enough assumes the belt is buckled in. + something to see if their sitting in the seat.

                      I mean you're not worried about wether or not their lieing to you about being buckled in, your worried about safety.
                      ---------
                      I'll do the bumbling, and i'll be the idiot.
                      if you've got a "stupid" question, search for some of mine!

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                      • #12
                        I have a very good solution for passangers in the back seat not wanting to use seat belts.

                        For my kids "buckle up, or there will be no playing PS3 tonight"... Problem solved...

                        For all others, especially grown ups... I drive like a maniac if they don't buckle up when I tell them to, so the latteral force throws them back and forth, and some times they have to when I stop the car.

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                        • #13
                          Originally posted by Crinos View Post
                          I have a very good solution for passangers in the back seat not wanting to use seat belts.

                          For my kids "buckle up, or there will be no playing PS3 tonight"... Problem solved...

                          For all others, especially grown ups... I drive like a maniac if they don't buckle up when I tell them to, so the latteral force throws them back and forth, and some times they have to when I stop the car.
                          since my car is like yours i guess thats the right approach!!!!

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                          • #14
                            This is a big job *if* your seatbelts aren't already wired with a sensor. Are they?

                            If not, you will have to come up with a way to add a sensor to a seatbelt in a way that does not interfere with the safety of their operation that is also child resistant. In most cases, that means taking the seatbelt apart, adding a sensor, putting it back together and being confident that it will still work as reliably as it did before you took it apart.

                            Are you confident you can do that?

                            If not, Enforcer's behavior-modification technique will work better. In our car, if you take your seatbelt off, we pull over to the side of the road and nobody goes anywhere until it is on. Simple rule: car in motion, seatbelt on. If there's an issue with that, we move on to reduced privileges for whatever it is that they most want to do this week.

                            If they are taking their seatbelt off and you aren't aware of it until you arrive at the destination, I suggest the same type of program, only harsher. Kids don't have any concept of the forces involved in a crash.

                            You could also show them this.

                            It may be much easier to modify the children's behavior than the seatbelt.
                            Originally posted by ghettocruzer
                            I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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                            • #15
                              just a friendly bump-- i saw this device on tv recently-- it is actually designed to prevent the car from starting without the seatbelts buckled, but i think that it might be useable in your case with a little rewireing:
                              http://www.dmetree.com/store/p-848-l...seat-belt.aspx
                              My OLD 2001 Mitsubishi Eclipse GT:
                              "The Project That Never Ended, until it did"


                              next project? subaru brz
                              carpc undecided

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