Frequency input on MPVI

[DSteck]

Would it be possible to add frequency reading as a form of input on the MPVI? Maybe duty cycle as well?...

I don't know if you can do an internal pull-up, but it'd be reasonable enough to just jumper a 10k resistor.

[agoins]

You could get a frequency to voltage converter and run it through that.

[DSteck]

You could get a frequency to voltage converter and run it through that.

There are delays and limitations with that unfortunately.

[agoins]

There are delays and limitations with that unfortunately.

Thats a bummer. I wish they would make provisions to connect to an external logger through serial like they do with widebands. I deal with some Campbell Scientific and National Instruments data loggers at work and being able to interface something like that with HP tuners would be great, but I am sure it is easier said than done.

I was thinking about using the external trigger (if it ever works again) to sync HP tuners with an external logger. It would be a pain to go through the data but it would be a way to get more data from added sensors.


Something like one of these below are fairly inexpensive.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/211872
http://www.mccdaq.com/usb-data-acqui...FS-Series.aspx

[NJ_Phil]

TI has the LM2917 and LM2907. Analog out depends on how fast the input frequency changes so it can be anywhere from a millisecond to 100 for the conversion. Good to 10 kHz and fairly linear in the middle of the band.

[agoins]

What pcm are you interested in doing this with? After doing some research into this, an e40 in a trailblazer has a fan speed sensor. I wonder if that could be used to read something like a compressor rpm signal?