Model train speed controller issue

Other Hardware Motors, Mechanics, Power and CNC
11

Hi,
Thanks for the info.
Have you got the gnd of the Nano connected to the gnd of the 12V rail supply, you need this as the signal from the Nano is with respect to the Nano gnd.

To conduct that current through the Darlington bases you need a return link through the Darlington emitters, so the rail supply gnd (0V).

What is your 12V supply?

Thanks.. Tom... :smiley: :+1: :coffee: :australia:
PS. You can also reduce the load on the Nano 5V regulator by using 10K pots rather than 1K.