overview.puml
@startuml

component "Central" as Central

component "xDuinoRail" as Decoder#Salmon

Decoder <- Central : MM / DCC
Central <- Decoder : mfx / RailCom / RailComPlus

component "I2C/TWI" as I2C
component "USB-C\n- Mass storage\n- CVs\n- Firmware\n- Sounds" as USBC

I2C <-> Decoder: "QWIIC / Stemma QT"
Decoder <..> USBC : "

component "MCU base boards" as MCU {

component ATMEGA328
component RP2040
component SAMD21
component STM32
component "RISC-V"

}
Decoder <--> MCU : "Arduino Headers (D2/D3/VIN)\nXIAO pinout"
USBC <.> MCU

component "Sensors & Actors" as SENS {

component "Motor/LED Drivers"
component "Sensors"

}
SENS <--> Decoder : "Arduino Headers\nXIAO pinout"

@enduml