Motion Sensor

How it works

Motion and presence sensors detect movement or the presence of people in a room. They are binary devices with two possible states:

• 0 (OK): No presence detected

• 1 (ALARM): Presence detected

1. The user sets the measurement interval.

2. The sensor counts movements within each measurement period.

3. If the number of movements exceeds the Movement Detection Sensitivity, the period is flagged as "1" (movement detected).

4. If the number of movements is below the threshold, the period is flagged as "0" (no movement detected).

5. The sensor evaluates consecutive periods:

   • If the number of consecutive "1" periods exceeds the Movement Detection Periods threshold, the sensor state changes to "1" (presence detected).

   • If the number of consecutive "0" periods exceeds the No Movement Detection Periods threshold, the sensor state changes to "0" (no presence detected).

6. If thresholds are not met, the sensor state remains unchanged.

This logic ensures accurate detection while filtering out short-term fluctuations or noise.

Configurable parameters

Sensitivity threshold: Movement	The number of movements within a measurement period required to mark the period with a "1" (presence detected). For example, if the threshold is 3, any period with more than 3 movements is flagged as "1."	Range: 1 to 65,535 (must be higher than Sensitivity Threshold: No Movement).
Sensitivity threshold: No Movement	The number of movements within a measurement period required to mark the period with a "0" (no presence detected). For example, if the threshold is 2, any period with fewer than 2 movements is flagged as "0."	Range: 0 to 65,535 (must be lower than Sensitivity Threshold: Movement).
Consecutive measurement periods: Movement	The number of consecutive measurement periods flagged as "1" needed to change the sensor’s overall state to "presence detected."	Range: 1 to 65,535.
Consecutive measurement periods: No Movement	The number of consecutive measurement periods flagged as "0" needed to change the sensor’s overall state to "no presence detected."	Range: 1 to 65,535.
Logic types	Controls the logic for the pulse input and the logic for the final returned value (movement/no movement).	Normal logic, Reversed logic
Pulse timeout	The maximum allowed length (duration) of a single pulse, in milliseconds. (Currently Unused)	0: Max pulse length is not checked. 1 to 65,535 milliseconds (must be greater than Debounce Time).
Debounce time	Ignore state changes shorter than this time (in milliseconds).	0: Debounce time not used. 1 to 65,535 milliseconds (must be lower than Pulse Timeout).

Configuration examples

Motion detector

If the device is used as a standard motion detector (changing state whenever movement is detected), set the parameters as follows:

• Movement Detection Sensitivity: 1

• No Movement Detection Sensitivity: 0

• Movement Detection Periods: 1

• No Movement Detection Periods: 1

Presence detector

Other settings are intended for use when the device functions as a presence detector. They help filter out short movements that could cause false positives (e.g., a door opening briefly triggering "presence detected") or false negatives (e.g., a person sitting still causing "no presence detected"). These parameters can be adjusted based on the characteristics and usage patterns of the room where the sensor is installed.

An example of using a presence detector in an office room with six workstations is shown in the picture below. The device was installed on the wall and covers all the desks in the room.

Efento motion sensor configuration:

• Movement detection sensitivity = 10

• No movement detection sensitivity = 0

• Movement detection periods = 1

• No movement detection periods = 2

The five-day measurement results for this configuration are shown in the chart below. The device detected movement only between 7:00 and 18:00 - office working hours. At other times, no movement was detected.