User manual

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IX. DHM5150 Human Motion Sensor Module

IX.1 Introduction

The DHM5150 Human Motion Sensor Module incorporates a pyroelectric infrared sensor to detect

infrared energy radiation from human body. The DHM5150 is able to detect human presence (like

security alarm) in the range up to 500 cm. With the use of two modules, human moving direction can

also be detected in the range up to 150 cm. Typical applications include a general-purpose security

alarm and human presence and motion sensing in a robot system.

IX.1.1 Features

• Human infrared radiation detection

• On-board signal conditioning

• Human presence detection up to 5 meters

• Human motion direction up to 1.5 meters

• Plug-and-play in the WiRobot system

IX.1.2 Applications

• Security alarm, human presence detection

• Human moving direction measurement

• Human-following devices

• Human avoidance and security robot

IX.2 Operations

IX.2.1 Theory of Operation

Infrared radiation exists in the electromagnetic spectrum at a wavelength that is longer than visible

light. Objects that generate heat also generate infrared radiation including animals and the human

body. The infrared radiation generated by human is strongest at a wavelength of 9.4 µm.

The sensor used in the DHM5150 module has two sensing elements. Together with a Fresnel lens, the

behavior of the sensor is shown in Figure IX.1.

Figure IX.1 Typical Sensor Behavior