Thank you for the schematic, very clear and helpful. It would only take one more resistor to add a switch (the safety switch electromagnetic relay), correct? I've only ordered 10 which should be here shortly. Which pin does it use on the Phenom?
I could solder on an t84 right away if I thought I had the skill. Maybe I can ask a friend to help me though. What functions were you thinking of, more firing modes or more refined logic? Originally, I envisioned an I²C library to have it connect to other devices such as a display and scroll wheel. Crazy, I know. I shelved the idea when I realized it would probably severely impact battery life and reliability.