AutomationShield
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OptoShield: The next one (R1->R2)
A future release of the Opto hardware could include another weaker LED, mounted at the middle of the tube and acting as a disturbance signal.
A future version or even a "plus" version can have a sensor measuring in physical lux units (like I2C devices) and use a DAC to stabilize low level output...
Careful with the too bright LEDs see https://github.com/gergelytakacs/AutomationShield/issues/14#issue-311960724
LED brightness specification needs to be explicit for the board.