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How to dectect presence/absence of something

Yes, there are many ways to detect presence/absence. The choice depends on the specific application. The belows show some ways to do it.

• Using the force sensor
• Using the IR beam sensor
• Using the reed switch
• Using the GPS module
• Using the accelerometer and gyroscope sensor
• Using the PIR motion sensor

Using the force sensor

• Object sits on the force sensor
• Sensor does not need to be attached on object.
• Detection bases on the weight
• Example use cases: detecting something is taken away

Using the IR beam sensor

• Object is placed between IR beam emitter and receiver
• Sensor does not need to be attached on object.
• Can detect any object
• Example use cases: detecting something is taken away, intruder detection

Using the reed switch

• One of two part of reed switch need to be attached on object.
• Can detect any object
• Example use cases: detecting something is taken away, detecting door closing/openning

Using the GPS module

• Sensor need to be attached on object.
• Detection bases on the position
• Example use cases: bike sharing economy

Using the accelerometer and gyroscope sensor

• Sensor need to be attached on object.
• Detection bases on the movement
• Example use cases: detecting something is taken away

Using the PIR motion sensor

• Sensor does not need to be attached on human/animal
• Can detect human/animal
• Cannot detect if human/animal is not moving
• Cannot detect object
• Cannot distinguish between human/animal
• Example use cases: auto lighting system, auto escalator, intruder detection

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