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Motherboard Wiring

Interface Diagram​

Interface Description​

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Pin Description​

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Power Wiring​

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Driver Installation​

Motherboard Driver Jumper​

  • STEP/DIR Mode. In this mode, microstepping is set using jumper caps, and current is adjusted via the potentiometer. The most common drivers requiring this are A4988, 8825. You need to consult the manufacturer's microstepping configuration table and set it using jumper caps.

  • UART Mode. The most common drivers using this mode are: TMC2208, TMC2209, TMC2226, etc. These driver chips can communicate with the main controller via UART asynchronous serial communication. Microstepping, run current, stealthChop mode, etc., can be set by modifying the configuration file.

  • SPI Mode. The most common drivers using this mode are: TMC5160, TMC2130, TMC2240, etc. Microstepping, run current, stealthChop mode, etc., can also be set by modifying the configuration file.

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Driver Installation​

  • Drivers should be inspected before installation to avoid damage to the driver or motherboard.

  • FLY Driver: If not using the infinite homing function, set the DIP switch to position 1; conversely, if you want to use the infinite homing function, set the DIP switch to the ON position.

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    Danger
    • CAUTION!!! When installing the driver module, ensure the orientation is correct, i.e., the EN pin is in the top-left corner. Incorrect installation may damage the driver or even the motherboard!!! Also, ensure proper heatsink attachment for the driver!!!
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Stepper Motor Wiring​

  • In 3D printers, the most commonly used is a two-phase, four-wire stepper motor. Its principle is shown in the diagram. There are two methods to identify the stepper motor wire sequence:

    1. Short any two of the four wires. Manually rotate the motor shaft. If the rotation resistance is very high, these two wires belong to the same coil group, i.e., A+ and A- or B+ and B-. If it rotates as easily as when not shorted, they are not from the same coil group.
    2. Use the continuity (buzzer) mode of a multimeter. Measure any two of the four wires. If the buzzer sounds, they belong to the same coil group. If not, they are from different groups; replace one wire and measure again.
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Heater Cartridge Wiring​

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Heated Bed Wiring​

  • AC Heated Bed: When wiring the solid-state relay, be careful not to mix up the input and output terminals.

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  • DC Heated Bed: When using the onboard MOSFET for a DC heated bed, pay attention to the power rating. The maximum current for a DC heated bed should not exceed 10A. If it exceeds 10A, it is recommended to use an external MOSFET module for the heated bed to avoid irreversible damage to the motherboard.

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Thermistor Wiring​

Thermistor Type Introduction​

  • The wiring method for thermistors is shown below. Please consult your supplier for the thermistor type.

  • If purchased from FLY (as shown below), set sensor_type to: ATC Semitec 104GT-2

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  • If it is a standard NTC 100K (as shown below), set sensor_type to: Generic 3950

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Motherboard Thermistor Wiring​

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Fan Wiring​

  • Fan Wiring

    Tip
    • The MOSFET must be installed.
    • Fan Wiring
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Endstop Wiring​

  • Endstop switches have two types: Normally Open (NO) and Normally Closed (NC). For 3D printers, it is generally recommended to use Normally Closed (NC). This way, if there is an issue with the endstop wiring, the system will report an error promptly, helping to avoid unnecessary crashes and potential damage to the printer.

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Bed Leveling Sensor Wiring​

BL-Touch Wiring​

  • The BL-touch has five wires in total. Three wires form the first group, responsible for powering the sensor and controlling the probe extension/retraction. The second group consists of a ground wire and a signal wire, outputting the limit signal. When wiring the BL-touch, carefully check the wire order. Incorrect wiring may permanently damage the sensor and the motherboard!!! The wiring method is shown below.

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Klicky Wiring​

  • Klicky is a third-party bed leveling sensor. It can be made at home at very low cost, offers stable performance, and is highly cost-effective. Its use is recommended. The wiring method is shown below.

  • Project Address: jlas1/Klicky-Probe

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Voron Tap Wiring​

  • Tap is a nozzle-based Z probe designed for V2 and Trident printer designs. The entire toolhead moves to trigger an optical switch, offering better accuracy than conventional endstop switches and compatibility with almost all printing platforms on the market.

    Caution

    It is not recommended to connect Voron Tap to 24V. Using 24V with certain versions has a probability of burning out the Tap sensor. This is not an issue with FLY products but a design flaw in Voron Tap. Please be aware!!!

    Danger

    Note: Do not reverse the 5V and GND connections, as this may damage the Tap sensor or even the motherboard!!!

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FLY-Mini12864 LCD Wiring​

  • The diagram below shows the wiring method for FLY's mini12864. For screens from other manufacturers, please consult the respective manufacturer. Incorrectly connecting or reversing the Mini12864 screen may cause the host computer to fail to connect to the MCU. If you could connect to the motherboard's MCU normally before using the mini12864 but cannot after connecting it, try disconnecting the mini12864 wiring!!!

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Connecting to Host Computer​

  • The motherboard connects to the host computer's USB port via a Type-C interface, or it can connect via a serial port. Only the former is introduced here.

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