Proximity

Intro

Proximity sensors can measure how near or far an object is.

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Sensor Description

Think of it echolocation in bats or dolphins.

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Use-cases

• Detect objects' absence and presence.    E.g. Items on the store shelves, cars in a parking lot, etc,
• Object avoidance.    E.g. Autonomous cars, robot vacuum cleaners, etc.
• Distance measuring.    E.g. Enforce 6 ft. apart, objects at a distance, etc.
• Volume measuring.    E.g. Fill tanks, water level measurement, etc.

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Implementation

For everyday distance detection we recommend this type of Ultrasonic Sensor (buy):

Note: If your application involves measuring levels of liquid in containers, using a more industrial, more weather resistant, and more expensive sensor would be the way to go.

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Here's a diagram for wiring the sensor to NodeMCU

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