My sketch for an Arduino and si5351 to implement a VFO, BFO, CW, keyer, and control lines is here. Make sure you look at read.me first. I have used it for at least a dozen homebrew transceivers and transmitters over the past four years (including all of my Summit Prowler SOTA QRP portable rigs), with constant refinement.
Piotr SP9LVZ contacted me and showed me his first successful attempt at getting the VFO Controller up and running with an OLED. Piotr then sent me updates and pictures over a 3 month period as his excellent multiband CW transceiver came together. This is a fantastic build and shows attention to design, physical, electronic and RF details that have payed off in the form of a handsome homebrew QRP CW transceiver.
In early May 2023, Piotr writes “Hello, I have completed the assembly of my QRP CW transceiver. Everything works fine! Today I participated in the national QRP contest and I made 31 QSOs. Final photos before closing the case. Thank you for all your help. VY73! Piotr SP9LVZ”. Well done Piotr!
My journey of repairing and recycling anything I put my hands on that I believe is still useful. Not just hardware, but including software with relevant content and issues in the field of Cyber Security, Vulnerability Scanning and Penetration Testing.