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Round rpm input settings

Rpm input settings
The Round Unit has a Rpm/Wheelspeed input to show on display or for special control features like boost control or idle control.
The Rpm input is on the DSub15 connector pin 10. It has a 10k pullup to 5V. The input signal have to pull down.

RPM input config rpm_toothcount: The number of pulses per crank rotation.

02 for a 4 cyl 2 events per rotation
58 for a 60-2 wheel
35 for a 35-1 wheel

rpm_multiplier o 229 - default for RPM display. Different value can be used to cheat, or for vehicle-speed.

The precision is 1 RPM. Note that display from 230 .. 15999 is possible. Above 9999 the first digit is hexa, so

a845 (=10845 RPM)
b231 (=11231 RPM)
c000 (=12000 RPM)
d888 (=13888 RPM)
e792 (=14792 RPM)
f999 (=15999 RPM)
fffu (above 16000 RPM)

For wheelspeed input

set rpm_multiplier=255 first, than adjust according to shown value (calibrate)
or you can calculate from the pulses / km.

example: 10 pulses / m = 10000 pulses / km

=> 1km/h = 10000 pulses / hour = 166.67 pulses / minute (to be displayed as "0001")
with tooth_count=167
and rpm multiplier= 229 (same as used for RPM)

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