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Lists technical specifications like driving modes, voltage, dimensions.
Specifies compatible motherboards with EXP interfaces.
Explains the function of the power indicator LED (D1).
Visual representation of the module's pin layout.
Instructions for configuring the STEP/DIR driver mode.
Instructions for configuring UART and SPI driver modes.
Covers jumper settings, voltage selection, and firmware needs.
The BIGTREETECH EXP-MOT V1.0 is a driver expansion module designed to enhance the capabilities of 3D printing motherboards by adding support for additional stepper motor drivers. Developed by Shenzhen Biqu Technology Co., Ltd., this module is specifically engineered to integrate with motherboards that feature EXP interfaces, thereby extending the number of available drivers for more complex or multi-axis 3D printing setups.
The primary function of the BIGTREETECH EXP-MOT V1.0 is to provide an expansion for up to three additional stepper motor drivers. This allows users to increase the number of motors controlled by their 3D printer, which can be beneficial for various applications such as multi-extruder systems, additional Z-axes, or other custom mechanical configurations requiring more independent motor control. The module acts as an intermediary, translating signals from the main motherboard to the expanded drivers, ensuring seamless integration and operation.
The module supports multiple driving modes for the expanded drivers, offering flexibility to users based on their specific needs and the capabilities of their chosen stepper motor drivers. These modes include STEP/DIR, UART, and SPI.
STEP/DIR Mode: This is a fundamental and widely used mode for controlling stepper motors. In this mode, the module provides separate step and direction signals to each driver, allowing for precise control over motor movement. When operating in STEP/DIR mode, the module can connect to the motherboard via the EXP2 interface. To ensure all three expanded drivers share a single signal line, it is necessary to plug short-circuit caps onto the M2EN and M3EN pins. This simplifies the wiring and signal management for the expanded drivers.
UART Mode: UART (Universal Asynchronous Receiver-Transmitter) mode offers more advanced communication between the motherboard and the stepper motor drivers. This mode typically allows for more detailed configuration and real-time feedback from the drivers, such as current settings, temperature, and error reporting. For UART mode, the module requires connection to both EXP1 and EXP2 interfaces on the motherboard. Unlike STEP/DIR mode, the M2EN and M3EN short-circuit caps are not needed in this configuration, as the UART communication handles individual driver addressing and control.
SPI Mode: SPI (Serial Peripheral Interface) mode is another advanced communication protocol that provides high-speed, full-duplex synchronous serial communication. Similar to UART, SPI mode enables comprehensive control and monitoring of the stepper motor drivers, often with faster data transfer rates. Like UART mode, SPI mode also necessitates connection to both EXP1 and EXP2 interfaces on the motherboard, and the M2EN and M3EN short-circuit caps are not required. Additionally, for SPI mode, the module needs to be connected to the "Motor-SPI" interface on the motherboard to facilitate the specific SPI communication lines.
The module is designed to be compatible with a range of motherboards that feature the EXP1 and EXP2 interfaces. Examples of compatible motherboards include the BIGTREETECH SKR V1.3, BIGTREETECH SKR V1.4, and BIGTREETECH SKR V1.4 Turbo, among others. This broad compatibility ensures that users with existing BIGTREETECH setups can easily integrate the EXP-MOT V1.0 to expand their printer's capabilities.
Integrating the BIGTREETECH EXP-MOT V1.0 into a 3D printer system involves several key considerations to ensure proper functionality.
Interface Connection: The module's connection requirements vary depending on the chosen driving mode. For STEP/DIR mode, only the EXP2 interface on the motherboard is needed. However, for the more advanced UART and SPI modes, both EXP1 and EXP2 interfaces must be connected. This distinction is crucial for establishing the correct communication pathways between the motherboard and the expanded drivers.
Logic Voltage Selection: The module supports different logic voltage levels, specifically DC3.3V and DC5V. It is imperative to select the correct logic voltage to match the motherboard's operating voltage. Generally, 32-bit motherboards typically operate at 3.3V, while 8-bit motherboards commonly use 5V. An incorrect logic voltage selection can lead to malfunction or damage to the module or motherboard. The module provides a jumper cap for selecting the appropriate logic voltage, which must be correctly positioned.
Input Power: The module requires an external input power supply, supporting either DC12V or DC24V. This power input is essential for the operation of the expanded stepper motor drivers. The "DCIN" port on the module is where this power supply should be connected. It is critical to ensure that the power supply connected to DCIN matches the voltage requirements of the stepper motor drivers being used and provides sufficient current.
Jumper Cap Configuration: Proper configuration of jumper caps is vital for the module's operation, especially when selecting the driving mode and enabling shared signal lines in STEP/DIR mode. Users must refer to the pin diagram and mode-specific instructions to correctly place these caps. Incorrect jumper cap placement can prevent the module from functioning as intended.
Firmware Adjustment: Before the module can be used normally, the firmware of the main motherboard needs to be updated and configured. This involves adjusting the motherboard firmware to recognize and utilize the three new driver pins provided by the EXP-MOT V1.0. Without these firmware adjustments, the motherboard will not be able to communicate with or control the expanded drivers. This step is critical for the successful integration and operation of the module.
The BIGTREETECH EXP-MOT V1.0 is designed for straightforward operation and minimal maintenance, primarily focusing on correct initial setup and visual checks.
Power Indicator: The module includes a red LED light, labeled D1, which serves as a power indicator. When the module is powered on and receiving normal power, this red light will illuminate. This provides an immediate visual confirmation that the module is receiving power correctly, aiding in troubleshooting initial power-related issues. If the light does not turn on, it indicates a problem with the power supply or connection.
Connection Verification: Regular visual inspection of all connections, including the EXP interfaces, DCIN power input, and jumper cap placements, can help ensure the module remains securely connected and configured correctly. Loose connections can lead to intermittent operation or complete failure.
Firmware Updates: While not a direct maintenance task for the hardware, keeping the motherboard's firmware updated is crucial for optimal performance and compatibility. As new features or bug fixes are released, updating the firmware can enhance the module's functionality and stability.
Troubleshooting Support: In case of any operational issues or problems encountered, users are encouraged to contact the manufacturer for support. The manufacturer commits to providing patient assistance and considering feedback seriously, which is a valuable resource for maintaining the module's functionality.
Overall, the BIGTREETECH EXP-MOT V1.0 is a versatile expansion module that significantly enhances the capabilities of compatible 3D printing motherboards by providing additional stepper motor driver support. Its flexible driving modes, clear power indication, and straightforward setup, combined with the necessity of correct configuration and firmware adjustments, make it a powerful tool for advanced 3D printing enthusiasts and professionals looking to expand their printer's functionality.
General| Product Name | BIGTREETECH EXP-MOT V1.0 |
|---|---|
| Category | Motherboard |
| Communication Interface | UART |
| Supported Firmware | Marlin, Klipper |
| Motor Channels | 4 |
| Input Voltage | 12-24V |
| Step Driver Type | TMC2209 |
| Driver Support | A4988, DRV8825, TMC2208, TMC2209, TMC2225, TMC2226 |
| Cooling Fans | 1 |
| Expansion Ports | UART |
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