CHAPTER 7
A CW Automatic Keyer
You may be thinking: Just what the world needs, another Arduino-based keyer. True, there are dozens of circuits for CW keyers based on several of the Arduino family of boards. However, using an Arduino board for something as simple as a CW keyer is an H-bomb-to-kill-an-ant approach to the problem. You could probably design your own keyer circuit using just three or so I/O pins. For that reason, we’re going to depart slightly from our usual Arduino project and consider using one of the minimal Atmel μC chips: The ATtiny85.
Another wrinkle we’re going to use to make our keyer a little different is that it uses capacitive reactance to activate the keyer circuit. This means you do not need to implement (or buy) a set ...
Get Arduino Projects for Amateur Radio now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
