[ScorpiusWireless]

Here it is. 
The SCX Solenoid driver and pins has been replaced by a Digital to Analogue Converter chip or DAC.
Our OLED driver connects to a 0.49" OLED screen to select channels.
We have utilised the two Photo Transistor analogue input pins to connect a set switch.
As usual the MPD is used as the mother board.
The board is powered off the 5V supply from the CU.
The DAC chip connects to the CU via the RJ12 telephone plug.
The Scorpius Controller to MPD data is complete.
And work is underway in the next few weeks to implement Carrera Controller protocols to the CU.
So as you can see the MPD really is a Multi Protocol Decoder capable of almost anything. 
In fact the Controller, USB Dongle and MPD can do every single function required for any brand. Very cool indeed.
The MPD boasts digital in/outs and now Analogue in/outs. 
Along with the TX/RX in/outs added and the OLED driver this is going to be a killer product.
And all this in 22.00x13.3mm.
Thankyou Johnny you are a legend!

   

Rick

[ScorpiusWireless]

The CU can also take  PWM data via ports and it’s also an option. Just trying to work out the most practical path.

[ScorpiusWireless]

Decision made, we're proceeding with PWM (digital code) instead of analogue. More firmware work but no DAC chip required.
This means if all is good we would have nailed the MPD hardware on the second manufactured version, which arrives in 4 weeks, although it will need to be thoroughly tested for data loss due to rail noise. Its still possible a minor hardware change may be required.
It also means we are one step closer to production once we test Carrera protocols, BEMF detection and current limiting. 

[ScorpiusWireless]

   

Here’s a mock up of what the Scorpius Carrera dongle will look like. A 6 wire RJ12 plug and wire is cut and soldered to MPD. 4 wires go to our 4 pin digital port and 2 wires vampire 5V off the Carrera Control Unit. 
The trade off with utilising the digital comms option over the analogue protocol is that we lose our OLED driver port. But we have a work around for that.

There is 2 uses for this dongle.
1. Nitrous system. Controller controls car direct but also sends controller data to the CU to maintain compatibility in regard to apps and ti get that important lane change signal to the rails via the CU. 
2. Use Scorpius controller only to connect wirelessly to the Carrera CU. 
The firmware for most of it is available from the Scorpius car decoder protocol firmware already complete. So for this product we need to reverse the Carrera controller code and send it to the 4 pin digital port. There is some information available online. Again it means working with the dreaded Manchester code.