You want to log your fuel pump voltage with your XFI 0-5 volt input

[norbs]

Hi if you wanted to log your fuel pump voltage for example with your XFI, but you only have a 5 volt input you need to build a voltage divider network, and connect to your analog inputs to lets say 16 volts in =5volts out

You can use the following online tool to build this...

http://tuxgraphics.org/toolbox/circuit-design-calculator.html

 

[TurboBob]

what is the input impedance of the XFI aux input, as it will act like a resistor parallel to R2.

Regardless, be sure to use a voltmeter to verify/calibrate the reading.

Bob

 

[kidglok]

Now come up with a way to log both pumps voltage simultaneously

 

[turbobitt]

FYI - This is the basic principal on building the volt booster to the alternator.
Allan G.

 

[kidglok]

blah

all this electronics lingo

 

[norbs]

what is the input impedance of the XFI aux input, as it will act like a resistor parallel to R2.

Regardless, be sure to use a voltmeter to verify/calibrate the reading.

Bob

That is a good point Bob, maybe a adjustable high precision variable resistor to compensate.

 

[norbs]

Now come up with a way to log both pumps voltage simultaneously

use another analog input channel.....