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Labs Idea #2: Bidirectional Movement Detector

Author: Sensirion Innovations Team - October 2017

  • Motivation
  • Approach
  • Implementation

Motivation

Persons and objects cause air turbulences when moving around. A flow sensor can detect the direction of such air turbulences. Thus, it is possible to determine the direction of movement of persons and objects passing by the air flow sensor. This valuable information can be used to drive actions for building control or surveillance purposes. A smart home might turn on lightning in the direction of detected movement. A smart thermostat might increase or decrease temperature based on room occupancy and load.


Approach

Sensirion's flow sensor is a semiconductor MEMS version of the traditional hot wire anemometer. The sensing principle is based on thermal conductivity through the gas flowing over the sensor surface (figure 1).

Figure 1: Thermal measurement principle

In opposition to diaphragm based differential pressure sensors, Sensirion's CMOSens flow sensor characteristic shows high sensitivity especially at low air flows (figure 2). This allows to reliably measure ultra low flows and differential pressures.

Figure 2: Sensirion flow sensors are more sensitive at low differential pressures than diaphragm type pressure sensors

A Sensirion flow sensor was attached to a doorway (figure 3, 4). Air movement was generated by a person entering and leaving the room. The sensor output was logged with Sensirion's EK-P3 Evaluation Kit.

Figure 3: Air flow sensor attached to doorway. EK-P3 evaluation kit used for data logging.

The measurement result demonstrates that Sensirion's air flow sensor can be used as movement detection sensor (figure 4-8). A person moving slowly or quickly is detected by the air flow sensor attached to the doorway.

Figure 4: Person moving slowly out of room
Figure 5: Person moving slowly into room
Figure 6: Person moving quickly out of room
Figure 7: Person moving quickly into room
Figure 8: Signal analysis of person passing through doorway

The event of an opening or closing door is also detected by its generated air turbulence (figure 9, 10).

Figure 9: Closing door and opening door quickly
Figure 10: Closing door and opening door slowly

Conclusion

  • Sensirion flow sensor detects slow and quick moving persons passing through a doorway
  • Direction of movement is detectable
  • Closing and opening of doors is detectable
  • Good signal-to-noise

Implementation

This paragraph should give in a how to style how to build the solution for the own purposes.

To build an own movement detection sensor a Sensirion differential pressure sensor SDP6xx series (figure 12) can be sourced from distributors listed on the Sensirion website.

By careful breaking the inner plastic ring seal from the sensor's backside, the sensor chip is uncovered (figure 12-15).

Figure 11: Sensirion SDP6xx series of differential pressure sensors
Figure 12: Carefully lift plastic frame from backside
Figure 13: Plastic frame detached from outer housing
Figure 14: Sensor chip uncovered ready to use for concentration measurements

Communicate with the digital sensor over I2C according to the explanations in the SDP600 series data sheet.


Patent Information

No information or recommendation presented on this website do absolve you from the obligation of investigating the possibility of infringement of third parties’ rights and, if necessary, clarifying the position.


Related Sensors to This Article

Sensirion Differential Pressure SDP600

Differential Pressure Sensors SDP600 Series

The digital SDP600 differential pressure sensors measure even minimal pressure differences with very high sensitivity and reliability. The sensors are fully calibrated and temperature compensated.


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