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ExperimentLEDs · Resistors · Piezo buzzer
LEDs & buzzer
The cheapest user interface there is — and the loudest.
The story, in 3 stages
- 01Threshold
- 02Light
- 03Sound
(01)The instrument
Outputs · LEDs + piezoSimulated · silent
Reading vs threshold
30°
Threshold 45°
LED 1LED 2
Buzzeroff
Drawn, never played. This site doesn't make noise.
A simulation of how the part behaves — not a recording of mine. Bench photos go in the evidence below.
(02)Threshold → Light → Sound
- 01 · Threshold→
The decision first
An output is only as smart as the decision behind it: a number crosses a line, and now the board has to tell a human.
- 02 · Light→
Always a resistor
An LED needs a pin to switch it and a current-limiting resistor — always. Two of them are enough to say “look at me”.
- 03 · Sound■
When light isn't loud enough
A piezo buzzer is for when a light isn't enough — like on a moving motorcycle, where nobody is looking at a dashboard.
(03)On my bench
What I actually did with it
- 01The warning side of the motorcycle safety prototype
[ADD — photos of the output side]
(04)Evidence
LEDs and buzzer[Add image]public/images/lab/outputs-01.jpg
Related on the bench