On 28/04/2021 15:49, Dave Plowman (News) wrote:
In article ,
charles wrote:
door bells never work - that's why they don't ring them. I've added a
sign - "please ring bell", but most of them don't.

My door bell push has two superbright LEDs. Clearly visible at all times.


Why do robots get LEDs for eyes? Eyes are supposed to receive light and
not transmit it!

(Yes, I do know that the LED is a reciprocal device and it sensitive to
receive light at the frequency it would transmit it)