Questions tagged [proximity]

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What types of proximity sensors would fit this bicycle application?

I'm looking into proximity sensors for bicycle attachments. The idea is to detect when a car passes close by to a rider. What are some types of proximity sensors that would be: Cheap Range up to 2 ...
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ESP32 proximity detection - how near, far and how accurate can it be?

I did some brief search on the matter, but it doesn't really help. I want to detect when people approach each other too closely, and - possibly, in the future - leave too great a distance between one ...