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By PSIG
#30881
Feature request of a voltage offset/correction, adjusted in TunerStudio, between a meter reading at the Speeduino input and the reported battery voltage by Speeduino. Perhaps a simple slider to adjust until the voltage readings match. No other curves or compensation. This would allow corrections due to inherent error in Arduino internal voltage or regulator reference, but also allow offsets such as adding inline reverse-polarity diode/transistor protection with an offset for true system voltage, allowing proper application of voltage corrections (injector latency, coil dwell, etc).

This feature request has been posted on GitHub, Feature Requests and Issues, #179.

David

Note here an example for reverse polarity protection, where the low-side (NMOS) is preferred, in order to avoid grounding shoot-through and damage to sensors, harness grounds, PCB traces, etc, if V+ is applied to the board GND connection:
TI_Rev_Polarity_FET_sm.jpg
TI_Rev_Polarity_FET_sm.jpg (100.99 KiB) Viewed 1042 times
By JHolland
#30883
PSIG wrote:
Thu Dec 27, 2018 6:47 am
....... also allow offsets such as adding inline reverse-polarity diode/transistor protection with an offset for true system voltage, allowing proper application of voltage corrections (injector latency, coil dwell, etc).
David
You can take the voltage reading from before the reverse voltage protection as long as there is adequate series resistance to protect the processor pin - this isn't usually a problem as the current has to flow through a voltage divider.
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