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Summary of change:
Older BMWs have a fuel consumption gauge on the dash. Someone has already implemented a standalone boost gauge for this, however it should be a simple extension of VEMS to handle this gauge directly A Canadian fellow developed his own circuitry to control the meter: * Forum discussion http://www.e30tech.com/forum/viewtopic.php?t=35635 * 1st video http://www.youtube.com/watch?v=S5KwL2DUkro * 2nd video http://www.youtube.com/watch?v=-6KX1V0j8bk A thought about the scale of the econometer is that it goes from 0 to 30. That could mean these pressures: * 0 = 0 kPa absolute vacuum * 10 = 100 kPa atmospheric * 20 .. * 30 = 300 kPa or 2 bar boost at sea level ---- Data from this forum thread: \ http://www.pure-pf.com/phpBB2/viewtopic.php?t=19563 0 = 0,00 V 10 = 0,58 V 20 = 1,10 V 30 = 1,58 V To max out the needle you need 1.75 Volts to pass the max marking. ---- A really basic and not entirely useless feature. Could possibly be designed to ouput other things. Could need a table, or a good approximation algorithm. * High impedance input assumed.. * What is a good pull-up voltage source? * Stepper output goes from 0-12 Volts: ** can it switch fast enough ** accurate for 0 up to 1.75 VOlts using PWM? * Can a 5 Volt output be used as pull-up when a regular output is used? ** Hall sensor output (if not used?) ** TPS +5V source ? * We have existing BOOSTGAUGE code for Audi instruments. Why not using that one?
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