Wiring & Electronics¶

This section documents the electrical architecture, wiring, controller configuration and hardware interfaces of the My-Cloner Rev A.

The My-Cloner Rev A uses a 24 V DC electrical system, an MKS Robin Nano V3 controller, TMC2209 stepper drivers and a Raspberry Pi Zero 2 W running Klipper and Mainsail.

Work in Progress

The My-Cloner Rev A electrical architecture is currently being prepared for physical bring-up.

Board-level information may already be confirmed while some My-Cloner-specific connections remain marked as pending validation.

Items should only be marked as Validated after successful testing on the physical machine.

Electrical Architecture¶

The main power and control architecture is:

graph TD
    AC[230 V AC] --> IEC[IEC C14 Inlet]
    IEC --> SW[Switch + Fuse]
    SW --> PSU[Mean Well LRS-350-24]

    PSU -->|24 V DC| BOARD[MKS Robin Nano V3]
    PSU -->|24 V DC| LM[LM2596]
    LM -->|5 V DC| PI[Raspberry Pi Zero 2 W]

    PI -->|USB| BOARD

    BOARD --> DRIVERS[5 x TMC2209 Drivers]
    DRIVERS --> MOTION[X / Y / Dual Z / Extruder]

    BOARD --> HOTEND[Hotend Heater]
    BOARD --> BED[Heated Bed]
    BOARD --> FANS[Cooling Fans]

    THERM[Thermistors] --> BOARD
    PINDA[P.I.N.D.A.] --> BOARD
    FILAMENT[IR Filament Sensor] --> BOARD

Documentation¶

System Overview

Understand the complete My-Cloner Rev A electrical architecture and how the main subsystems work together.

System Overview
Power Distribution

AC input, IEC inlet, Mean Well power supply, 24 V distribution and the 5 V Raspberry Pi supply.

Power Distribution
Controller Board

MKS Robin Nano V3 hardware, STM32F407 MCU, driver interfaces, heaters, sensors, fans and auxiliary connections.

Controller Board
I/O Map

The central mapping between physical devices, board connections, MCU pins, Klipper sections and validation status.

I/O Map
Motors & Homing

TMC2209 drivers, five stepper motors, dual Z architecture, UART and X/Y sensorless homing.

Motors & Homing
Heaters & Temperature Sensors

Hotend and bed heaters, thermistors, thermal protection, PID calibration and temperature validation.

Heaters & Temperature Sensors
Fans

4010 hotend cooling, 5015 part cooling, Robin Nano fan outputs and PWM validation.

Fans
Display & Filament Sensor

MKS TS35 V2.0 integration, EXP interfaces and the MK3-style IR filament sensor.

Display & Filament Sensor

Source of Truth¶

Information	Authoritative Source
Mechanical design	Current My-Cloner CAD / prototype
Components	My-Cloner Rev A BOM V2
Electrical wiring	Current My-Cloner electrical schematic
Board-level pin mapping	Official Makerbase Robin Nano V3 documentation
Klipper board mapping	Official Klipper Robin Nano V3 configuration
My-Cloner I/O assignments	I/O Map
Final firmware configuration	Validated My-Cloner `printer.cfg`

Documentation vs Validation

Official board documentation can confirm what a pin or connector does.

It does not automatically validate how that resource is used by the My-Cloner.

My-Cloner-specific assignments must be checked against the electrical schematic and validated on the physical Rev A machine.

Current Bring-Up Status¶

Several electrical decisions are intentionally still open until the physical Rev A machine is available.

These include:

P.I.N.D.A. controller input
FAN1 / FAN2 functional assignment
IR filament-sensor input
TMC2209 current values
X/Y sensorless-homing thresholds
Motor directions
Exact thermistor models
Heater power
PID calibration
Thermal limits
MKS TS35 V2.0 integration
Final printer.cfg

These items will move from Pending to Validated during the physical bring-up process.

Safety¶

Mains Voltage

The printer contains 230 V AC mains wiring.

Disconnect the printer from the mains supply before opening or modifying the electrical system.

First Power-On

Do not attempt a complete printer power-on immediately after wiring.

Validate the system in stages, beginning with the mains input and power supply before connecting sensitive electronics.

For the complete pre-power procedure:

Before First Power-On