Digital read (boolean value) from phototransistor

[johnerrington]

@zazamcdonald

the convenience of TRUE/FALSE would be easier. How is it accomplished

If you use an op amp you can set a threshold for the light level you wish to trigger from.

Using Operational Amplifiers in your Arduino project

4: Using Op Amps: A Practical example Measuring light level with a photodiode Photodiodes are used in many every day electronic devices such as cameras, smoke detectors, burglar alarms, safety equipment, medical applications, CD players and surveying instruments. They can be used to detect a wide range of electromagnetic radiation, from infra-red through the visible to ultraviolet and even x-rays. They aren't just for visible light. How they work When a photon (a bit of light or other EM wav…