Dear Stephane,

have you implemented the CAN interface based on CAN-OPEN?

I'm looking for the counterpart of it.. CAN to signal for vehicle signal measurement. (Trucks)

To Mahmood,

the most easiest way is to build a software pulse counter and compare each 5 (or more) seconds the pulses to your system.

if (counter >= MAX_SPEED * Vehicle_calibration)
relay = TRUE;
else
realy = FALSE;

Optional : use a schmitt-trigger system to avoid unstable 'clicking' of the relay.

Have fun ...