Universal K3NG Rotator Controller System

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.… Read more...

Nextion for K3NG Rotator Controller Videos

A series of videos demonstrating the VK4GHZ Nextion for K3NG Rotator Controller

Part 1 – Basic Az system

Part 1 looks at a basic azimuth-only system and introduces you to some of the functionality offered.


Part 2 – Elevation

Part 2 introduced elevation functionality and adds a decimal place to Az & El readings.… Read more...

Eltek Flatpack2 Interface Board Considerations

How to interface your Eltek Flatpack2 to the outside world?

To prevent re-inventing the wheel, several options already exist and looking on ebay.com.au we find;



One thing we discover is, ebay cannot count to five properly!

A subtle change in search terms can reveal alternatives, such as the board from Slovenia;

Search results can be inconsistent, even when using the same search terms, with repeated searches.… Read more...

Degrees Symbol for K3NG Rotator Controller Nextion – 2

The K3NG rotator controller is extremely well supported by the author, Anthony Good, K3NG.

Since the last bug report, one issue, easily overlooked by those not entirely familiar with the Nextion display,  has been identified that can easily cause grief,

Along with creating fonts with iso-8859-1 encoding, make sure when setting up your Nextion HMI project in the Nextion Editor, that the character encoding type is also set to iso-8859-1.… Read more...

Degrees Symbol for K3NG Rotator Controller Nextion

This video shows how you can get the degrees symbol ° on the K3NG Rotator Controller’s Nextion touchscreen.
Applies to version rotator controller v20.06.26.02.
It’s a simple matter of editing four lines of code in the main .ino file.
In the normal world “0xF8” would be the correct way to address the ° symbol, but not with these damn Nextions!

12-bit ADC Resolution for K3NG Rotator Controller

The K3NG Rotator Controller project is aimed towards Arduino Mega 2560 or similar hardware.

Standard ADC resolution on many of the Arduino boards is 10-bit, however the Arduino Due, Zero, and MKR family and Teensy 3.x family have 12-bit ADCs.

So if you’re running this hardware, why not make use of the extra ADC resolution with four easy steps;


1  – Change rotator_features.h

IC-410PRO Mic Connector AF output

An Icom IC-410PRO UHF transceiver is being interfaced to a Clear-Com intercom system via a TW-47.

I/O required between the IC-410PRO via it’s 8-pin RJ45 connector and the TW-47 are:

• Ground
• Mic Ground
• Mic
• AF Out

In line with the dumbing down of society , there is no mention of microphone pin outs in either the IC-410PRO Basic Manual or the “Advanced” Manual, so attention turned to a compatible microphone, the Icom SM-26 for further information.… Read more...