I am almost done with my Arduino getting started kit, and the last task is to hack something else using the Arduino.
I have since the beginning had the ideer that I wanted the Arduino to control some slot cars. I have measured the slot car controller, and it is running 20V, and the controller is a variable resister.
My ideer was to exchange the controller for a Optocoupler controlled by the arduino. I suspect that I will need the two wires from the controller coming into the breadboard, og soldered directly to the optocoupler, but I suspect that I will also need a resister so I do not short the circut? Do I need a resister, and if so, how large?
Is it possible to do with a Optocouple like sugested in the book, and then control the speed using Duty cycles?
Will the optocouple be able to handle the 20V coming from the slot car track?
The one I have is a 4N35. I suspect it to be this one: http://www.vishay.com/docs/81181/4n35.pdf
I hope that you will be able to point me in the right direction.
Best Regards Brian.