Math help with Hertz

[1Steveo]

I need to simmulate a speed sensor form a automobile.
The sensor outputs 4000 pluses per mile (PPM)!
At 60 mph what is the feq/herts of the pluse?

I need to have a Slave Pic send a simulate a speed sensor! HELP!!!

Steveo

 

[Rolf]

I need to simmulate a speed sensor form a automobile.
The sensor outputs 4000 pluses per mile (PPM)!
At 60 mph what is the feq/herts of the pluse?

I need to have a Slave Pic send a simulate a speed sensor! HELP!!!

Steveo

Is 60 mph not one mile per minute? Now we are getting close, just a little more simple math. I'll give you a clue it is simple division.

 

[mister_e]

or experimentation... just unplug the sensor, and plug a generator instead.

from what i feel... it will also depend of the tire sizes... it's no coincidence why tire replacement chart exist when you want to oversize the 'factory' tire size.

 

[Hero999]

Come on work it out for yourself.

Hz means cycles per second
60mph (as has already been stated) is one mile per miniute.
There are 60 seconds in a miniute.

Oh well I'm off to do something more challenging than teaching primary school work.

 

[1Steveo]

Mr e,
I was hoping to use a PicMicro as an "Pluse Generator" to simulate the speed sensor form my vehical driven at 60MPH. ie a high pluse every 500 ms = 1 Hertz right?

 

[mister_e]

Sure a PIC will work. A simple 555 circuit too.

 

[Hero999]

Mr e,
I was hoping to use a PicMicro as an "Pluse Generator" to simulate the speed sensor form my vehical driven at 60MPH.

A 555 is far more simple and cheaper.

ie a high pluse every 500 ms = 1 Hertz right?

That depends on the duty cycle, at 50% duty you're right, a 1Hz waveform would be on for 500ms then off for 500ms.