Speed and sensor

Hi,

I'm trying to program a speed reading with an inductive sensor. I'm having trouble programming the time between two pulses and then converting it to a minute to get revolutions per minute (RPM). I want an instantaneous reading. My equipment is suitable for this (sensor and input board).

Can you help me, please?

Fabrice

Hi Fabrice,

One hint is to use the monotonic time to get the right speed also when the system time is adjusted, eg

static pwr_tTime last = {0,0};
pwr_tTime current;
pwr_tDeltaTime dt;
pwr_tFloat32 time;

if (d1) {
time_GetTimeMonotonic(&current);
if (last.tv_sec != 0) {
time_Adiff(&dt, &current, &last);
time_DToFloat(&time, &dt);
OA1 = 60.0/time;
}
last = current;
}

d1 is pulse edge and OA1 is speed.

/Claes