Arduino-si5351 VFO sketch

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.

VFOs around the World

David VK3KR is using the script to run this finely made VFO BFO Controller module in a compact portable all homebrew SSB and CW transceiver for 160 to 20m. The VFO board was designed and fabricated (JLPCB) by Glenn VK3PE. David is planning to include a W6JL 50 watt amplifier module — making for a very nice transceiver for Parks and SOTA activations.
Robert SP3RAF from Poznan in Poland is using the script to develop a compact holiday SSB and CW radio for 80, 40, 30 and 20m, with ADE-1 mixers, dual gate MOSFET IF amplifiers (BF1012), and a push pull RD16HHF1 FET PA. Pictures to follow.
Jerry W0PWE used some of my code to develop this 40m CW QRP mobile transceiver, which he operates while driving the East Coast USA highways!
Heinz VK4YI built this beautiful multiband transceiver based on the OzQRP MST design, with my script.

Mladen 9A3XZ tried out my script in a ‘al fresco EI9GQ transceiver… https://www.youtube.com/watch?v=W5QgSOsWgi8

Adrian M1LCR was looking to use my script to update his excellent 8-band G6LBQ transceiver. He is also building an EI9GQ transceiver in the style of the wartime clandestine brief case radio.
Hubert F6DUK used my sketch in his finely made 60m monobander, based on he VK2DOB OzQRP MST design.
Hubert F6DUK’s fine VFO assembly.
Lorenzo I3ZYJ showed me his Arduino si5351 VFO as a crystal bank replacement in an older 2m FM transceiver.
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