Convert Version 1 to Version 2

[gizmologist]

Greetings!

I am the proud owner of a Defusable clock Rev1. I’m a better hardware hacker than programmer. What can I do to turn this into a Rev2, other than update the firmware? Specifically, which pin of the ATMega is the “TRIGGER” output, and what is that extra diode? is it to protect the circuitry from the relay’s back EMF?

Thanks for any help!

[Michael]

The trigger is connected to the A0 (analog pin 0) pin. This is ping 23 on the ATmega328 chip.

The new diode is simply to protect against someone connecting power with the wrong polarity. You don’t need it for V2 functionality.

[Author]

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