In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

PJ Allen,

Since detecting inductance changes in the coil is somewhat difficult and unreliable, especially when the road floods,
I was thinking of using another method of detecting vehicles.

How about using 2 or 3 PING))) ultrasonic detectors to verify the that vehicle has passed before closing the barrier gate?
What is your opinion on the reliability.

Thanks.

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