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Simple door and window open/close sensors typically consist of a two-piece design:
The first item is a magnet enclosed in a plastic case, usually attached to the moving element, a front door, a bedroom door, a window sash, a gate, a garage door, etc.
The second item could be one of two types of sensors: a magnetic reed switch (a mechanical element) that closes an electrical contact when a magnet is placed within close proximity to the switch. The other type is a Hall Effect (non-mechanical element) active element that outputs a signal, the level of which varies with the distance between the magnet and the sensor.
Either sensor design senses 'opened' or closed' state of the portal to which it is attached. The sensors do not count how many objects might pass through those portals. Such a counting process could be facilitated through use of specifically-positioned infrared, laser or ultrasonic sensors or camera/object recognition systems.
I've worked in the electronics field for decades.
The first item is a magnet enclosed in a plastic case, usually attached to the moving element, a front door, a bedroom door, a window sash, a gate, a garage door, etc.
The second item could be one of two types of sensors: a magnetic reed switch (a mechanical element) that closes an electrical contact when a magnet is placed within close proximity to the switch. The other type is a Hall Effect (non-mechanical element) active element that outputs a signal, the level of which varies with the distance between the magnet and the sensor.
Either sensor design senses 'opened' or closed' state of the portal to which it is attached. The sensors do not count how many objects might pass through those portals. Such a counting process could be facilitated through use of specifically-positioned infrared, laser or ultrasonic sensors or camera/object recognition systems.
I've worked in the electronics field for decades.