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ELECTRONICS

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
EXAMPLEHighway Speed Checker
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CASE ANALYSIS

Scenario

Two infrared beam break sensors are placed a known distance apart across a highway lane. A 555 timer measures the time between the first and second beam interruptions and lights an LED while the vehicle travels between them.

Key decisions

  • Use two IR LED/photodiode pairs as start/stop sensors
  • Configure the 555 in monostable mode with the second sensor resetting the IC to stop timing

When to reuse this

Reuse this netlist when you need a low-cost analog vehicle speed sensing front end, such as in highway monitoring, traffic counting, or speed warning displays.

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