I have no idea how the servo motor you mention works. I don't suppose it is likely to be very complex and probably you could create your own controller once you have worked out what sort of signal it needs.Have you considered leaving it controlled by the existing CDI ignition system (with the HT side isolated or neutralised somehow) and simply add your own separate ignition system to do the actual sparks?Is what you're proposing to do actually legal in your jurisdiction?
Is it a must for you to re-use the CDI? Why not using a Transistor ignition. All you need is :- Any Arduino- A ignition coil with integrated amplifier (search in ebay for 6N0905104 and you will find a cheap VW Golf one)- some control circuitry. The circuitry will pull the control pin to GND to charge the coil and remove the GND to fire. All this is done with a cheap NPN Transistor as switch. Pls see here http://www.bosch-motorsport.de/en-US/literature/en-US/Ignition_Module_IM_3.1_Datasheet_51_en_2778273675.pdf for a sample setup. I think the Bosch ignition amplifier was the master of the spare parts "copy".- some input circuitry getting the TDR125 trigger clean to the Arduino interrupt pin- Potentially small circuitry "cleaning" the spiky TDR input voltage with a inductor and capacitor- any housing
Using the coil from TDR? "No" in this case. The Bosch one will replace your one.May take a look to this page for stepper motor control: http://arduino.cc/hu/Tutorial/StepperUnipolar. May this fits you needs. But I think you need to investigate a little more how the motor works...Have you searched for manuals how to tune the TDR? I found a few of them (in german unfortunalety) with a few clickes like http://www.yamco.de/tzr125offen.html or http://tdr-125.de/. They are speaking about "grounding" a ceratin cable of the CDI...
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