News for hackers. Stuff that matters.

A comment on How to use LEDs to detect light. Parent comment

Re:How to use LEDs to detect light by tobyhinloopen on Thursday August 30, 2018 @04:19AM (#17874927)
Your OLED display doesn't have a lens though, so you would only see light differences
[ Parent | on HN ]
Re:How to use LEDs to detect light by amelius on Thursday August 30, 2018 @04:59AM (#17875140)
The keyhole of the door could serve as a pinhole.
[ Parent | on HN ]