You'd have to make a circuit to interpret the VSS signal and switch the ground to the MS input on/off. Using SX/B, the program logic should be pretty straightforward...


Switch PIN OUTPUT
VSS PIN INPUT

Speed VAR Byte
Trigger VAR Byte

SpeedMult CON ? ' VSS Scaling Factor
TriggerCon CON 10 ' Whatever speed you choose...

Start:
Trigger = SpeedMult * TriggerCon

Main:
PULSIN VSS,0,Speed
IF Speed > Trigger THEN Switch = HIGH
ELSE Switch = LOW ENDIF

GOTO Main


Then just build a little circuit with a VREG/caps, output transistor, and a few resistors for protection. Voilà.

The rest of the settings (RPM setpoint, etc.) are controlled by MS.




-http://www.symtechlabs.com/-