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ELECTRONICS

Laser-Based Highway Speed Checker

A worked electronics example, rendered live. Open it in the AI editor and adapt it to your own case.

UPDATED 2026-09-11
TYPECircuit
USE-CASEHighway Speed Checker
EXAMPLELaser-Based Highway Speed Checker
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CASE ANALYSIS

Scenario

Two laser beams across the road detect a vehicle; the start sensor triggers a 555 monostable, and if the stop sensor closes before the pulse ends, the vehicle exceeded the speed threshold and an alarm lamp lights.

Key decisions

  • Use a 555 monostable to create a fixed time window
  • Model optical sensors as pushbutton switches for schematic clarity
  • Drive an alarm lamp with a BJT switch gated by the stop sensor

When to reuse this

Reuse for any two-point speed gate or presence timer where a fixed detection window and threshold comparison are needed.

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