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+# 🔥 Laser CANbus Toolhead PCB
+
+A compact, robust toolhead board for Klipper-based laser engravers and cutters (CoreXY). This board integrates power supply, laser driver logic, CAN-Bus communication, and input shaping (ADXL345) in the smallest possible space.
+
+![Laser CANbus Toolhead PCB](img/Laser%20CANbus%20Toolhead.png)
+
+## ✨ Features
+
+### 🧠 Microcontroller
+- **MCU:** STM32F072CBU6 (Cortex-M0, 48MHz, CAN-capable)
+- **Stability:** 12MHz crystal for maximum CAN-Bus stability
+- **Firmware:** Klipper-compatible
+
+### 🔗 CAN-Bus Communication
+- **Transceiver:** SN65HVD230 with ESD protection
+- **Termination:** Split termination via solder jumper
+- **Slope Control:** Switchable for EMI optimization
+
+### 📊 Input Shaping
+- **Sensor:** On-board ADXL345 accelerometer (SPI)
+- **Purpose:** Klipper resonance measurement for perfect print quality
+
+### ⚡ Laser Power Control
+- **Circuit:** 24V / 4A High-Side Switch (AO4407A P-MOSFET)
+- **Soft-Start:** Limits inrush current (Rise-time ~1.2ms)
+- **Safety:** Hardware pull-down prevents unwanted activation
+
+### 🎛️ Laser Signal Control
+- **PWM:** 5V Level-shifted via 74AHCT1G125 buffer
+- **Quality:** Clean edges, true hardware PWM via STM32 timer
+- **Compatibility:** Common diode lasers
+
+### 🔌 Power Supply
+- **Input:** 24V with 250mA PTC fuse and SMF24A TVS diode
+- **5V Rail:** MP2459 Buck converter (up to 60V input tolerant)
+- **3.3V Rail:** XC6206 LDO for MCU and peripherals
+
+### 🚨 Diagnostics & Monitoring
+- **Power LEDs:** 24V In, 24V Sys, 5V, 3.3V
+- **Status LEDs:** Laser Enable, Laser PWM, Heartbeat
+
+## 📋 Klipper Configuration
+
+### Basic MCU Setup
+```ini
+[mcu toolhead]
+canbus_uuid: <your-uuid>  # Find with "ls /dev/serial/by-id/*" or "~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0"
+
+[temperature_sensor toolhead_mcu]
+sensor_type: temperature_mcu
+sensor_mcu: toolhead
+```
+
+### Input Shaping (ADXL345)
+```ini
+[adxl345]
+cs_pin: toolhead:PA4
+spi_bus: spi1
+axes_map: x,y,z
+
+[resonance_tester]
+accel_chip: adxl345
+probe_points:
+    150, 150, 20  # Adjust to your bed size
+```
+
+### Laser Control
+```ini
+# Laser PWM Signal
+[output_pin laser_pwm]
+pin: toolhead:PB14
+pwm: True
+cycle_time: 0.001          # 1kHz PWM frequency
+shutdown_value: 0          # Safety: laser off during emergency
+
+# Laser Enable (optional)
+[output_pin laser_enable]
+pin: toolhead:PB15
+value: 0
+shutdown_value: 0
+
+# Heartbeat LED (optional)
+[output_pin heartbeat]
+pin: toolhead:PA9
+pwm: True
+cycle_time: 1.0
+```
+
+## 🔌 Pinout & Connector Assignment
+
+### J101 - Power & CAN Input (Micro-Fit 3.0, 2x2)
+| Pin | Signal | Description |
+|-----|---------|-------------|
+| 1 | **+24V** | Main power input (High Current) |
+| 2 | **GND** | Ground |
+| 3 | **CAN_H** | CAN-Bus High Signal |
+| 4 | **CAN_L** | CAN-Bus Low Signal |
+
+### J102 - Laser Output (Micro-Fit 3.0, 1x3)
+| Pin | Signal | Description |
+|-----|---------|-------------|
+| 1 | **GND** | Laser Ground |
+| 2 | **PWM** | 5V PWM Signal (Level-Shifted) |
+| 3 | **+24V** | Switched Laser Power (Soft-Start) |
+
+### Debug/Programming Header (Back Side)
+| Pad | Pin | Signal | Function |
+|-----|-----|---------|----------|
+| 1 | - | **5V** | 5V Supply (from Programmer) |
+| 2 | - | **3.3V** | VTref (Reference Voltage) |
+| 3 | PA13 | **SWDIO** | Serial Wire Debug I/O |
+| 4 | PA14 | **SWCLK** | Serial Wire Debug Clock |
+| 5 | - | **NRST** | Reset Signal |
+| 6 | - | **GND** | Ground |
+
+> **💡 Bootloader Mode:** To force the STM32 into DFU/Bootloader mode (e.g., for initial flash with Katapult), bridge the **BOOT0** pad with **3.3V** during power-on.
+
+## 🔧 Installation & Setup
+
+### 1. CAN-Bus Configuration
+- Set CAN-Bus termination according to position in network
+- Baud rate: 1 Mbit/s (Klipper standard)
+
+### 2. Firmware Flash
+1. Put board into DFU mode (bridge BOOT0)
+2. Compile Klipper for STM32F072 with CAN support
+3. Flash firmware: `make flash FLASH_DEVICE=<dfu-device>`
+
+### 3. Find UUID
+```bash
+~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
+```
+
+## ⚠️ Safety Notes
+
+- **Laser Safety:** Always wear protective eyewear
+- **Power Supply:** Only operate with 24V DC
+- **Initial Setup:** Slowly ramp up laser power
+- **Emergency:** Hardware pull-down ensures safe state
+
+## 🛠️ BOM (Bill of Materials) - Highlights
+
+| Component | Value/Type | Function | Package |
+|-----------|------------|----------|---------|
+| **U101** | STM32F072CBU6 | Main Microcontroller | UFQFPN-48 |
+| **U102** | MP2459GJ-Z | Buck Converter 24V→5V | TSOT-23-8 |
+| **U105** | SN65HVD230DR | CAN-Bus Transceiver | SOIC-8 |
+| **U106** | ADXL343/ADXL345 | 3-Axis Accelerometer | LGA-14 |
+| **Q101** | AO4407A | P-MOSFET (Laser Switch) | SOIC-8 |
+| **D101** | SMF24A | TVS Diode (Overvoltage Protection) | DO-214AC |
+| **F101** | 1812L025 | PTC Fuse 250mA | 1812 |
+| **Y101** | 12MHz | Crystal for CAN Stability | HC-49/S |
+
+## 🛠️ Technical Specifications
+
+| Parameter | Value | Unit |
+|-----------|-------|------|
+| **Input Voltage** | 24 ± 2 | V |
+| **Laser Current (max)** | 4 | A |
+| **CAN Baud Rate** | 1 | Mbit/s |
+| **PWM Frequency** | 1 | kHz |
+| **Soft-Start Time** | ~1.2 | ms |
+| **Operating Temperature** | -10 to +70 | °C |
+| **Dimensions** | TBD | mm |
+
+## 📚 Additional Resources
+
+- [Klipper Documentation](https://www.klipper3d.org/Config_Reference.html)
+- [CAN-Bus Setup Guide](https://www.klipper3d.org/CANBUS.html)
+- [Input Shaping](https://www.klipper3d.org/Resonance_Compensation.html)
+- [Katapult Firmware Flasher](https://github.com/Arksine/katapult)
+
+---
+
+*🇩🇪 Deutsche Version: [Readme.de.md](Readme.de.md)*