Initialisation depot
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DCC-Centrale/README.md
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DCC-Centrale/README.md
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# DCC-Central
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DCC-Central consist in a complete system to drive DCC scale models.
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## Principles
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System is based on ESP32-S3 WROOM devKit, with some peripherals :
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- ILI9341 4.0" display module
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To display what is happening
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- Touch screen
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To allow direct managing
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- MCT2515 can interface
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Used for accessory and feedback
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- LM 18200 Hbridge (Drive track power / accessories )
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- DCC signals or DC - can be switched to program,
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- second to send square signal - powers accessories
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- ACS712 current sensor
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Read DCC power send to track
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- RAILCOM detector - input pin
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- KY-040 rotary encoder
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set speed / enventually help to navigate in menus
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- relay
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Swith 2 Rails / 3 rails
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## Functionnalities
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DCC-Central is connected with CDM-Rail (protocol to choose), but can work alone. It will be RailCom compatible
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On display we must have :
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- Select Autonomous / CDM-Rail driven switch
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- Select DC / DCC type
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- Select 2Rails / 3 Rails
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If autonomous and DCC
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- Select Programming mode
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- Select Loco ID
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- Display Functions buttons
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- Add a tab to display informations returned
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### Running
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1. User choose a DCC-id to drive a loco with help of display
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2. he selects type of signal DCC/DC (display)
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3. track type ( 2rails / 3 rails)
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4. Switch 'ON' track power
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System response
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- Switch relay ON (2 rails), OFF (3 rails)
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- generate PWM (DC) / DCC signal (DCC)
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- if DCC signal, set DCC loco id and drive DCC signal
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- if DC signal, set DC (PWM)
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- Power ON LM 18200
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## Wiring
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## Wiring
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Below is a general guide on how to wire the main elements of the DCC-Central system, with suggested ESP32 GPIO numbers:
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- **ESP32-S3 WROOM devKit**: Serves as the main controller. All peripherals connect to its GPIO pins.
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- **ILI9341 3.2" Display Module**: Connect the SPI pins to the ESP32 as follows (suggested):
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- MOSI: GPIO 23
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- MISO: GPIO 19
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- SCK: GPIO 18
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- CS: GPIO 5
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- DC: GPIO 21
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- RESET: GPIO 22
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Power the display with 3.3V or 5V as required by the module.
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- **Touch Screen**: If integrated with the display, connect the touch controller (often XPT2046) SPI pins as follows (suggested):
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- T_MOSI: GPIO 13
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- T_MISO: GPIO 12
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- T_SCK: GPIO 14
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- T_CS: GPIO 15
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- T_IRQ: GPIO 27
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You may share SPI bus with the display if supported. Connect IRQ pin to a free GPIO.
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- **MCP2515 CAN Interface**: Connect SPI pins as follows (suggested):
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- MOSI: GPIO 23 (shared with display)
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- MISO: GPIO 19 (shared with display)
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- SCK: GPIO 18 (shared with display)
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- CS: GPIO 4
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- INT: GPIO 16
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Connect CANH and CANL to the CAN bus. Power with 3.3V or 5V as required.
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- **LM18200 H-Bridge**: Connect control pins as follows (suggested):
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- IN1: GPIO 32
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- IN2: GPIO 33
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- PWM: GPIO 25
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Connect motor outputs to the track or accessories. Power the H-Bridge with the appropriate voltage for your track/accessories.
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- **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.
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- **RailCom Detector**: Connect the detector output to ESP32 GPIO 26 (digital input). Follow the detector's datasheet for power and signal wiring.
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- **KY-040 Rotary Encoder**: Connect as follows (suggested):
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- CLK: GPIO 34
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- DT: GPIO 35
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- SW: GPIO 17 (if used)
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Use pull-up resistors if required.
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- **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.
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### ESP32 Pin Usage Summary
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| Peripheral | Signal | ESP32 GPIO |
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|---------------------------|----------------|------------|
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| ILI9341 Display | MOSI | 23 |
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| | MISO | 19 |
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| | SCK | 18 |
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| | CS | 5 |
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| | DC | 21 |
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| | RESET | 22 |
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| Touch Screen (XPT2046) | T_MOSI | 13 |
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| | T_MISO | 12 |
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| | T_SCK | 14 |
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| | T_CS | 15 |
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| | T_IRQ | 27 |
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| MCP2515 CAN Interface | CS | 4 |
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| | INT | 16 |
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| LM18200 H-Bridge | IN1 | 32 |
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| | IN2 | 33 |
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| | PWM | 25 |
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| ACS712 Current Sensor | OUT | 36 (VP) |
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| RailCom Detector | OUT | 26 |
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| KY-040 Rotary Encoder | CLK | 34 |
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| | DT | 35 |
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| | SW | 17 |
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| Relay | CTRL | 2 |
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**Tips:**
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- Double-check voltage compatibility for each module.
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- Use common ground for all modules.
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- Keep power and signal wires as short as possible to reduce noise.
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- Refer to each module's datasheet for exact pinouts and requirements.
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**NB** a PCB card will be designed with KiCad Software for easier assembly.
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