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Here's some testing.
Probing the zero cross on the scope to see if we are detecting it OK.
Looks like the zero cross is being detected just fine:
Probing the AC wave at varios delays on the triac:
Now with a 2W (blue) resistor replacing the previous one that was getting HOT! See a previous picture of the board where that resistor was getting a bit brown :)
No Delay (full power, bright light):
More Delay (about half brightness)
Large delay (not much power, dim light)
Next page is the software on the microcontroller:
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