ILI9341 4.0" display module To display what is happening
Touch screen To allow direct managing
MCT2515 can interface Used for accessory and feedback
LM 18200 Hbridge (Drive track power / accessories )
- DCC signals or DC - can be switched to program,
- second to send square signal - powers accessories
ACS712 current sensor Read DCC power send to track
RAILCOM detector - input pin
KY-040 rotary encoder set speed / enventually help to navigate in menus
relay Swith 2 Rails / 3 rails

Functionnalities

DCC-Central is connected with CDM-Rail (protocol to choose), but can work alone. It will be RailCom compatible

On display we must have :

Select Autonomous / CDM-Rail driven switch
Select DC / DCC type
Select 2Rails / 3 Rails

If autonomous and DCC

Select Programming mode
Select Loco ID
Display Functions buttons
Add a tab to display informations returned

Running

User choose a DCC-id to drive a loco with help of display
he selects type of signal DCC/DC (display)
track type ( 2rails / 3 rails)
Switch 'ON' track power

System response

Switch relay ON (2 rails), OFF (3 rails)
generate PWM (DC) / DCC signal (DCC)
if DCC signal, set DCC loco id and drive DCC signal
if DC signal, set DC (PWM)
Power ON LM 18200

Wiring

Below is a general guide on how to wire the main elements of the DCC-Central system, with suggested ESP32 GPIO numbers:

ESP32-S3 WROOM devKit: Serves as the main controller. All peripherals connect to its GPIO pins.
ILI9341 3.2" Display Module: Connect the SPI pins to the ESP32 as follows (suggested):
- MOSI: GPIO 23
- MISO: GPIO 19
- SCK: GPIO 18
- CS: GPIO 5
- DC: GPIO 21
- RESET: GPIO 22 Power the display with 3.3V or 5V as required by the module.
Touch Screen: If integrated with the display, connect the touch controller (often XPT2046) SPI pins as follows (suggested):
- T_MOSI: GPIO 13
- T_MISO: GPIO 12
- T_SCK: GPIO 14
- T_CS: GPIO 15
- T_IRQ: GPIO 27 You may share SPI bus with the display if supported. Connect IRQ pin to a free GPIO.
MCP2515 CAN Interface: Connect SPI pins as follows (suggested):
- MOSI: GPIO 23 (shared with display)
- MISO: GPIO 19 (shared with display)
- SCK: GPIO 18 (shared with display)
- CS: GPIO 4
- INT: GPIO 16 Connect CANH and CANL to the CAN bus. Power with 3.3V or 5V as required.
LM18200 H-Bridge: Connect control pins as follows (suggested):
- IN1: GPIO 32
- IN2: GPIO 33
- PWM: GPIO 25 Connect motor outputs to the track or accessories. Power the H-Bridge with the appropriate voltage for your track/accessories.
ACS712 Current Sensor: Connect VCC and GND to power, OUT to ESP32 GPIO 36 (analog input, VP). Place the sensor in series with the track power line.
RailCom Detector: Connect the detector output to ESP32 GPIO 26 (digital input). Follow the detector's datasheet for power and signal wiring.
KY-040 Rotary Encoder: Connect as follows (suggested):
- CLK: GPIO 34
- DT: GPIO 35
- SW: GPIO 17 (if used) Use pull-up resistors if required.
Relay: Connect relay control pin to ESP32 GPIO 2. Use a transistor driver circuit if the relay requires more current than the ESP32 can provide. Connect relay contacts to switch between 2-rail and 3-rail track wiring.

ESP32 Pin Usage Summary

Peripheral	Signal	ESP32 GPIO
ILI9341 Display	MOSI	23
	MISO	19
	SCK	18
	CS	5
	DC	21
	RESET	22
Touch Screen (XPT2046)	T_MOSI	13
	T_MISO	12
	T_SCK	14
	T_CS	15
	T_IRQ	27
MCP2515 CAN Interface	CS	4
	INT	16
LM18200 H-Bridge	IN1	32
	IN2	33
	PWM	25
ACS712 Current Sensor	OUT	36 (VP)
RailCom Detector	OUT	26
KY-040 Rotary Encoder	CLK	34
	DT	35
	SW	17
Relay	CTRL	2

Tips:

Double-check voltage compatibility for each module.
Use common ground for all modules.
Keep power and signal wires as short as possible to reduce noise.
Refer to each module's datasheet for exact pinouts and requirements.

NB a PCB card will be designed with KiCad Software for easier assembly.