Hi Colin and All the Arduino is fed with either 5 or 3.3 volts to get round this you can buy an add on board called a motor shield which fits over the arduino exactly, with a small cut in a track to stop it sending current to the main unit you can introduce say 18 volts without the cut only 12 volts. Both the arduino uno and shield can be bought for less than £10 from China genuine made in Italy units less than £30. the clever software incidentally called a sketch is loaded via a usb cable From a pc The combined units provide the correct dcc circuit married to the higher voltage to power the motor. I'm happy with the 12 volts as I only want to introduce a secondary single track on a dc layout the unit is also capable of providing two outputs POM and a program track Back to my original quest. I've successfully downloaded the software (free public domain) and uploaded it but I'm not getting any output readings and was looking for help round that issue. I see two possible problems one being conflicting instructions on which pinholes to connect the jumper wires to or That I've only loaded part of the sketch As RAF says this is important to get just right and his excellent sniffer paper will be useful as a module to copy get the loading right. Hopefully when I've got that right running the jmri will fall in to place. Using a Raspberry Pi might be the solution to that and you can get them for £25 on that well known sales channel. I know I've now spent £55 why not buy a used unit ? But that's way and I'm eager to add more skills before the virus gets me!!