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Ever since getting my benchtop CNC running, I have not been very happy with the lack of manual control over overrides and buttons.

This DIY Engineering video gave me a great idea: build one myself.

I wanted the smooth speed and feed overrides, so I decided to not go with HID device, but instead with a full serial control paired with a custom plugin on the UCCNC side.

Here is the Fusion design of the enclosure:

And here it is 3D-Printed.
Acrylic face engraved from the back side and painted.
And all buttons and controls mounted:

All I have to do now is wire the Arduino board, program the plugin, and test it!


Here is the video of the pendant in action:


1. PCB Design

Design notes:

  • All resistors used were 10K
  • Speed and Feed potentiometers are 10K
    Their pinout goes Wiper->ground = 0%, Wiper -> +5V = 200%
  • Axis and Handwheel Increment rotary switches are 4-position and their pinout goes like this:
    Axis select 1-X, 2-Y, 3-Z, 4-A, C-Common (+5V)
    Handwheel Increment 1-0.0001, 2-0.0010, 3-0.0100, 4-0.1000, C-Common (+5V)
  • All function buttons such as Jog +/-, M1, M2, etc are sending +5V signals to the digital pins D2-D12
  • D13 digital pin is connected to a LED indicator and is used to tell the user that the Pendant is allowed to send signals to the plugin.

Design files:

2. Enclosure Design 


If you don't have a 3D printer and/or a CNC Mill, please contact me and I will send you a 3d-printed enclosure and the 3d-printed or milled acrylic face plate:

  • 3D-Printed Black PLA Enclosure (shown in pictures): 30$ + shipping
  • 3D-Printed Black PLA Face Plate (optional): 15$ + shipping
  • CNC Milled and Engraved unpainted (clear) acrylic Face Plate (shown in pictures): 30$ + shipping

3. Arduino Setup

  • Install the Full Firmata library onto your Arduino Nano (Or any other Ardiono that supports USB Serial Communication): imageStandardFirmata sketch used for Arduino NANO is also added to the release package
  • Please note that you might need to install Arduino USB Driver in order for your Arduino to work on the target computer!

4. UCCNC Setup

  • Download the latest LEETArduinoPendant from the releases and extract it to your PC.
  • Copy the LEETArduinoPendant.dll plugin file to the C:\UCCNC\Plugins directory!
  • Copy the Solid.Arduino.dll file from the Solid.Arduino release folder to the C:\UCCNC directory.
  • Please note that you might need to install Arduino USB Driver in order for your Arduino to work on the target computer!
  • Launch UCCNC.exe, go to Settings->Configure Plugins, and mark the LEET Arduino Pendant plugin as Enabled and Call startup
  • After everything is installed, Arduino is connected and UCCNC is running, press the "Enable" (+5v to D2-B-ENABLE ) button that will tell the plugin that the pendant is ready to send signals! D13 (LED+) will then have a continuous +3.3V signal alerting you of that!

Hardware Acquisition (Amazon)

Fusion F360 desing files Size:2.55 MB
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