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Soren Winkler Rasmussen
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355 Posts
Hi Maltese
QUOTE (Maltese @ 13 Dec 2004, 19:49)What do you all mean when you say "I want to run analog, too"?Why not make a digital system able to run in analog mode as well?. It's quite trivial seen from a technical point of view, and it would make it much easier to migrate from analog to digital systems.

You could obviously still only run one car per slot, when using the analog mode, but at least you'd be able to run your old cars without any modifications.

There are still a few potential advantages over the traditional approach with a resistor in series with the power supply:
The controller doesn't get warm, because there is very little current running through it.
You are not so sensitive to the current drawn by the motor, because you regulate the voltage instead of the current (not so much fiddeling with matching resistor values to the cars motor and gearing).
You have the possibility to implement programmable throttle response curves, and dynamic braking.

A quick technical description:
The digital mode will reverse slot polarity modulated by the communication signal ... in other words, there's always full power, but with changing polarity.
The analog mode would use the same H-bridge driver hardware, but with PWM modulation instead of polarity reversion. If you turn it on half the time and off the other half of the time, you'll get half power to the track. This way you can put anywhere from 0% to 100% power to the track by software control.

Søren
 

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Soren Winkler Rasmussen
Joined
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355 Posts
Hi Maltese

Just a little comment

QUOTE (Maltese @ 13 Dec 2004, 19:49)<snip> as chipping them all is ridiculous for large collectionsThat's true if the car controllers are expensive


It's a little less ridiculous if they are cheaper


I was hoping that around half the price of the Scalextric controllers would be within reach.

Best regards
Søren
 
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