External Trigger with photodiode connected to analog pins of Cyton

I wanted to explore the option of external triggers for visual stimuli, we show images to participants and want to have a trigger exactly when image is displayed on the monitor.

I was wondering if it would be a good idea to connect photodiode connected to analog pin of the cyton and update firmware code to check for photodiode readings and somehow put marker on data stream?

is it possible? how precise the markers would be?



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