Martin ROGER / VXDash - History

Trip and Odo

Added trip and odometer readings to the pulse counters
Some issues with the MUX on the bench
Added force-reset of the screen
Need to clean up the schematics

Updated LTSpice OpAmp circuit simulation

Went and plonked a non-ideal LM358 OpAmp model. Suspicion is that the Common mode voltage is too close so it is non-linear above 80Ohm (which corroborates the observations from before.
Suggestions of correction :
- Change OPAMP with tighter common mode voltage limit
- Change supply voltage of OPAMP to 7V and above -> Risky business
- Change Rset and Vref to something lower. Ideally could go down to Vref at 3V and would lose a little bit of resolution between 3V and V3 but could also lose the voltage divider (5.1K and 2.7K) thus reducing stray current .

In any case upload a V2 of the circuit with those different options

Create Calibration reference.xlsx

Documenting the excessive current through the Rsense...

PCB update

To reflect pin reassignments

Code refactor act deux

Moved a lot of repetitive pattern functions to their own .h files to allow for easier readibility. Same goes for general shared variables.
Still compiles !

Code refactor for PlatformIO

Refactoring and changes of order of declarations

Updated schematic and code

GPIO4 is reenabled but subject to suspicions
Schematic is updated, PCB is not.