Thanks guys for the suggestions. Apologies for providing very scarce description of the application.
Basically, what I'm trying to do is to use the vehicle's OEM fuel sender and share the readings between the original fuel gauge in the instrument cluster and newly added systems monitor, details of which can be found here:
https://www.simarine.net/product/st107-tank-module/
In terms of specs:
- the resistance range of the sender is 10ohm to 10kohm,
- resolution - preferably analog, but I'd be happy with 8-bit (256 positions) - although the simarine module seems to be using 16-bit microcontroller.
- excitation signal - not too sure, one circuit is the vehicle's electronic fuel gauge, the second circuit is the analog input of a microcontroller, so I imagine it would be sensing current?
- isolation voltage: simarine operates on 5V, not sure about internal voltage of the car's ECU, but will obviously be under 12V.
I'm looking for simplest solution that will do the job, I was thinking of something as simple as an electronic relay switching between the two circuits at certain frequency, but I imagine it would interfere with the sampling rate and averaging algorithm, hence scewing the results?
Look forward to hearing more thoughts.
Thanks in advance.
Tom
- - - Updated - - -
- the resistance range of the sender is 10ohm to 10kohm,
EDIT: the range of the fuel sender is actually few hundred ohms - not sure exactly how much.
Cheers.