Status: Planning · Started: July 2026

Overview

I need a CW keyer. I don't want to buy one, but let's put together a relatively straightforward build using preexisting firmware.

The build-log posts on the blog will capture the build as it happens; this page holds the current (and at some point final) state of the design: references, open questions, decisions, and eventually schematics, board layouts, and test results.

References

• K3NG Arduino CW Keyer — source and documentation for the firmware
• TODO Arduino pinout
• TODO LCD pinout

Open Questions

• None

Decisions

• Use an Arduino Pro Micro. I have one on hand, and it's got a micro USB not a mini USB.
• Use a 16x2 screen (vs no screen). Why not. I have one on hand.
• Use a rotary encoder with button for CW speed and control mode. Kinda like the QMX.
• Four memory buttons, three LEDs (I can lay them out nicely).
• Use Arduino as the power source.

Schematics

(Not yet — will appear as design work starts.)

Board Layouts

(Not yet.)

Build Notes

(Not yet — module-by-module notes will go here, with links to the relevant build-log posts.)

Test Notes

(Not yet — bench checks, timing measurements, and on-air results.)