Update 11-Feb-2021:

• NX8048K035 5.0″ Firmware Update


A universal rotator controller project based on Anthony Good’s popular K3NG rotator controller.

This project features a Teensy 3.2 microcontroller and Nextion Enhanced HMI with custom user interface.

• Yaesu G-800DXA (and G-1000-DXA, G-2800-DXA) azimuth rotator control

• Yaesu G-800DXA (and G-1000-DXA, G-2800-DXA) PWM speed voltage output

• Az analogue potentiometer input

• El analogue potentiometer input

• Yaesu G-5500 compatible for CW/CCW/Up/Down control

• PWM motor driver for linear actuator elevation control

• i2c extender for remote sensors via cat5

• Spare cat5 pair pads available

• Audible alert output

• Teensy RTC battery connection

• GPS serial data pass-through (genuine FTDI chip) to USB for time-syncing PC

• Four NO push-button switch inputs with pull-ups


Universal Main controller board











Rear Connectors








Development Remote Unit at the end of a 30m (100ft) run of cat5 cable.

Elevation sensor is an ADXL-345 accelerometer.  i2c extenders at both main and remote unit are P82B96 dual bi-directional bus buffers.

Primary Nextion display, one of many pages available.

Nextion screen is responsive to features set in Arduino files, so you only see what is relevant.


Nextion HMI features:

• Numeric Azimuth and elevation display
• Gauges Azimuth and elevation display
• CCW/CW/Up/Down rotator control
• Configurable preset positions with names
• Configurable colours/fonts
• Park button
• Go To grid square
• Co-ordinates converter – convert between lat/lon and grid square
• Configuration – Screen
• Configuration – Rotor
• Numeric keypad for entering numbers
• ABC keyboard for entering text & numbers
• Diagnostics page
• Moon & Sun tracking page
• Satellite tracking page
• Satellite selection list
• Satellite AOS page
• Satellite tracking world map


At VK4GHZ, Yaesu G-800DXA rotator for azimuth, and linear actuator (being driven by a MC33926 Motor Driver Carrier board) used for elevation control.




Universal Schematics and PCB Overlays (pdfs)

Main Board (updated 4/2/2020)



PCB Top – K3NG Rotator Controller Main V3


PCB Bottom – K3NG Rotator Controller Main V3



Universal Bill of Materials




Remote Board (updated 11/9/2020)





VK4GHZ Nextion firmware for K3NG Rotator Controller available from:

VK4GHZ Nextion for K3NG Rotator Controller



Project PCBs

Will be available to purchase from the vk4ghz.com store.

More to follow, so keep checking back here.


You can find me on the Radio Artisan Groups IO:  https://groups.io/g/radioartisan/


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