Morning everybody :slight_smile: VDO sender in the tank, 0-90 ohm range. 200 ohm pullup resistor from +5v to A1, as it’s the lowest value I have here. Ran a sensor ground and A1 to the sender in the tank. I Set A1 as a calibrated sensor in software, enabled 10k pullup in software. Drained tank …

you need 1meg pull down set on adu

Thank you Greg, I tried that as well and still no reading change and ADU 1 voltage greyed out on graph log at ~1.0v. I realised I do have lower value resistors here, obviously have 120 ohm for CAN use, would this be better? I am not sure how low we can go before it is an issue for the ADU output, c…

Thanks Greg, quick one, my fuel level seems to be reading now, although it has a very small voltage swing of about 1.55v at full and 0.74v at empty. I have the tank level filtering source as the analogue input, and have the fuel level bar graph source as ecu.fuel level or however it is named, it se…

if you have that small change you need smaller pullup

How small can you go before it’s an issue, current wise? 200 ohm is already pretty small in the scale of things, isn’t it. Going with a typical half of the resistance rule of thumb is going to result in a ~40 ohm resistor, is the ADU going to like that? I have a 39 ohm but is it going to get warm? …

100 ohms is safe, I’ve gone as low as 20 ohms without issue. Granted fuel level was the only 5V sensor on that build. Yes it uses ecu.fuel as the output from the filtering parameter. It’s just a channel name. If you want to change the channel name and log in Litres but maintain the filtering you c…

Thanks man, I appreciate that :slight_smile: Just stuck a 39 ohm in it, no other sensors powered by the dash, with no plan for future expansion (although I do have a spare input/output connector on the loom). Thank again to you both!

Calibrating fuel level

ADU

Greg March 14, 2025, 9:07am 4

make sure is logged also on logging configuration setup

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Calibrating fuel level

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