Trip Computer - Why missing values?

[DocOfClocks]

Perhaps someone out there with coding experience can explain this, but I can't think of a single reason why a digital display needs to skip digits. For the mi/kwh readout, you never see 2.9, 3.0, 3.2, 3.4, 3.6, etc. Why?

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[timbop]

My guess is because they are trying to reduce the fluctuations in the display. If they're too precise, then the number will bounce around all the time. I suspect they also have some "fuzzy" logic so that if the computed value varies from 3.19xxx to 3.2xxx they just keep displaying 3.1 rather than ping-ponging between 3.3 and 3.1

 

[benk016]

I've seen 3.0, 3.1, 3.2, 3.4 and 3.6

It does seem to only update periodically. and There are a few spots I thought it was skipping numbers, but eventually I've seen them.

 

[timbop]

I've seen 3.0, 3.1, 3.2, 3.4 and 3.6

It does seem to only update periodically. and There are a few spots I thought it was skipping numbers, but eventually I've seen them.

I've seen 3.0, 3.1, 3.3, 3.5, and 3.7. I have never seen 3.2, 3.4, or 3.6

 

[DocOfClocks]

I've seen 3.0, 3.1, 3.2, 3.4 and 3.6

It does seem to only update periodically. and There are a few spots I thought it was skipping numbers, but eventually I've seen them.

Interesting, but in over 2000 miles I've never seen some of these values.

 

[Scarpia]

I agree that it only uses certain values, at least in my experience. I am invariably seeing 3.3, 3.5, 3.7, 3.9, 4.1, and 4.4 - and nothing in between those. Very odd. It does make me wonder about the accuracy.

I've been thinking of getting one of the OBD readers, as I'm pretty sure this info would be available. It would be interesting to compare.

 

[AZBill]

The issue is that they are coding with fixed point math, and getting rounding errors when converting to BCD, Binary Coded Decimal, for the display.

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