3 ms·

You don't just press the button and see what happens?

• function_seven 3y ago
  If the indicator light is on, the OP presses the button, and that same indicator light remains illuminated: What did we learn? It could still be a, “hey, press the button” light. Or it could be a “button already pressed” light
  • mayneack 3y ago
    That's true if you only ever press one light. You can still learn the pattern in a given area with experimentation (assuming most lights work the same). I know, for example, that lights in LA indicate that it's already pressed, but would have to experiment in a new city.
• whywhywouldyou 3y ago
  That's the point. Adding the LED does very little to help the user understand the state. In the end, you'll just push the button anyway to make sure.
  • oneeyedpigeon 3y ago
    In the UK, where this kind of behaviour is the default, we just learn it from a young age, possibly at school.