pp5vx
There are 3 repositories under pp5vx topic.
pp5vx/TinyKeyer
ATTiny13/25/45/85: "An Ultra Simple Iambic Keyer with Speed Pot" !
pp5vx/The-5-kiB
An "Accu-Keyer" ( WB4VVF ) Clone for the Arduino ( or ATTiny45 or 85 )
pp5vx/pp5omt
PP5OMT: ( World's First ? ) HF WX Telemetry CW Beacon