reg microcontollers

hello all,
I am new to this group.i planned to do microcontroller
project . its called collision dectection
if suppose 2 cars are moving the same side when the distance reduces
less than 1m some device to tell the driver
that reduce the speed.
i am Engg student .i need to which type of sensors i have to use and
i need to know how to start this iam using keil version .
planing to do in embedded C. iam expecting this group members help to
complete this successfully.

(siva) wrote in message . com...
hello all,
I am new to this group.i planned to do microcontroller
project . its called collision dectection
if suppose 2 cars are moving the same side when the distance reduces
less than 1m some device to tell the driver
that reduce the speed.
i am Engg student .i need to which type of sensors i have to use and
i need to know how to start this iam using keil version .
planing to do in embedded C. iam expecting this group members help to
complete this successfully.

I don't know a lot about this, but here's how I see it. You will
obviously need some hardware to detect the distance of the other
vehicle. This could be sonar, optics, and I'm not sure what else.
Someone else will have to help you there.

The output from that system could be either analog or digital. If
it's something like an analog voltage, you will need to perform an
analog to digital conversion on it. This will give you a number that
is the same fraction of the maximum value as the input voltage is of a
reference voltage value (got that?). Once you've got that value (or
if the input signal was digital to start with), then you simply need
to examine that value to see if it indicates that the target is less
than one meter away.

One you've made that determination, you will just have to use an
output pin to send a signal, e.g. high meaning "the vehicle is too
close" and low meaning "no problem". This can enable an LED or
whatever your signal to the driver is.

You will have to set this whole thing up to check at regular
intervals. This could be done by simply making a C loop, which is
inelegant, but simple. A better way to do it would be to have a
time-based interrupt cause the CPU to execute the function that
contains the code for the distance check.

The hardware sounds to me like the more complex part of this
project... the C shouldn't be too bad (but then I'm more of a software
guy). Good luck!