[ScorpiusWireless]

Ok here’s a serious mock up.

What is it? It’s a dongle that receives Scorpius throttle data and turns it into Carrera throttle data and delivers it to a RJ12 telephone plug that connects to the Carrera CU.

We now we have not just one but two 12C data ports. This negates the need of a seperate DAC chip as mentioned in previous posts here.

The blue and white wire are 12V power from the CU that powers the MPD. Phew no battery required.
The pic is based on the upcoming MPD V5 prototype coming in March with two 12C data ports not just one.
It will come with pins specifically for a reset switch pcb and a pcb mounted micro (momentary) switch.
So here I’ve replaced the Carrera reset switch with an off the shelf momentary switch connected to the 2 pins.
The OLED will be held in place by a 3D printed surround. It will be powered off the MPD.
The RJ12 plug is re-soldered to the MPD as shown.
At this stage I’m using a Carrera Dongle casing as it has a smart matching (to the app connect box) enclosure with the reset hole and screen cut out, labelling, as well as the RJ12 plug with a nice shroud where it leaves the enclosure. 
As you can see the MPDs small size makes for an easy install and everything fits nicely with room to spare.
I could also re-program an existing Carrera dongle. But we like everything hardware wise to be proprietary. It’s a possibility though and something to consider. 

Here we will simply use the proposed MPD V5 as is and only a firmware change is required.

That firmware upgrade won’t be easy. The good news is its only simple throttle signal and a LC switch signal.

The MPD “Digital wireless slot car Arduinos” adaptability and flexible interface make it so much easier to turn almost any conceivable idea into reality.