Security camera e railway semaphore: o que têm em comum

1. Passo 1. Security camera — tem como parte — Image sensor. A sensor.
2. Passo 2. Image sensor — faz parte de — Computer mouse. The motion sensor is a tiny camera.
3. Passo 3. Computer mouse — tem como parte — LED. An optical mouse.
4. Passo 4. LED — faz parte de — Traffic light. LEDs.
5. Passo 5. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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