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how i foundout my car speed while sitting on the car

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drbizzarow

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hi 2 all
can anybody help me find car speed withhout using its speedo meter...
i know it can be done by ultrasonic speed finder but i want to know the speed of a car when im sitting on it not out side the car any matter wil be very helpful to me
thx in advance
 

jamshid.dastur

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well seems your doing something adventurous...well what comes into my mind is mount a camera in front of the speedometer and have the screen on your lap outside the car:D...
Do tell us what are you up to...

Best Regards
 

plusminus

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Maybe an anemometer will help. But if there is a wind outside you have to correct the value you meassure.

Or a pressure meter. You have to convert the pressure to speed.
 

binu_ji

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By using a GPS in your hand you can get the speed from the GPS.
 

barrybear

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The distance between 2 lampposts is 50 meters. shorter in a built up area. time yourself between these 2 points and speed = distance divided by time
 

drbizzarow

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thx to all friends who guide me .......
im trying instal something in my car if someone drvie my car more the my set speed it start alarming etc

binu_ji & Pavel_S
..... im also thinking these to implement thse 2 idea ( GPS or Acelerometer). i think it will help to solove my problem. any comments on this idea wil be guide me more.
thx 2 all
 

Kryptonite

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barrybear said:
The distance between 2 lampposts is 50 meters. shorter in a built up area. time yourself between these 2 points and speed = distance divided by time
Is that distance standardized all over the world??

If not, where can I find such information for certain city or country??
 

funnynypd

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drbizzarow said:
thx to all friends who guide me .......
im trying instal something in my car if someone drvie my car more the my set speed it start alarming etc

binu_ji & Pavel_S
..... im also thinking these to implement thse 2 idea ( GPS or Acelerometer). i think it will help to solove my problem. any comments on this idea wil be guide me more.
thx 2 all
Some advanced GPS got similiar function for speed limit.
There is another way to do it yourself a gauge with speed limit function. This will depends what communication protocol your car has. Most of new vehicle after 1996 got OBD on board, such as K line, J1850, CAN etc. You will need more info.
 

barrybear

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The distance between 2 lampposts is 50 meters. shorter in a built up area. time yourself between these 2 points and speed = distance divided by time
I am not shure about anywhere else but in England if you are in a built up area then the lamposts are closer together than if you are driving in a 40mile an hour area. Next time you are out see if this is correct.
 

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