Relays, The Electromechanical amplifier

Pyroelectric Infrared Sensor and Fresnel lens

DPB PYD1798 Digital Motion Detector components

DP-001 Digital Motion Detector Module

DP-002 Digital Motion Detector Module

How IR motion detector components work

Focusing devices for pyroelectric sensors

RIR Reflective Infrared devices 



Digital Infrared Motion Detector Module

With NEW  Digital  Sensor






New miniature micropower digital motion detector module operates on 4 to 15 volts at only 45 microamperes. Programmed with default sensitivity and dwell, module is ready to use, just connect power and output.

The module is a basic building block designed for use in the construction of a motion detector device. It includes a digital pyroelectric infrared sensor, a microprocessor and both logic level and relay driver outputs. An on-board voltage regulator powers the circuits and accepts a 4 to 15 volt DC power supply voltage. The power system includes reversed polarity protection.

The DP-001A eliminates the need to design and build the complex amplifier and comparator circuits that must follow a typical analog pyroelectric infrared sensor. The relay driver within the DP-001A can sink up to 200 milliamperes to directly drive a relay, light emitting diode or other load. The logic output can also be fed into a logic or timing circuit to add specific functions such as robot control or triggering a camera shutter.

The DP-001A is designed to detect infrared radiation (IR) from a moving human or animal both in daylight and at night. It will only respond to a moving source of infrared radiation. It will not detect a static IR source. The DP-001A is electrically the same as the square DP-003A.


  • Small 3/4 inch (19mm) diameter, 3/8 inch (9.6mm) thick module
  • On board voltage regulator
    • Can be powered by 4 to 15 volts DC
  • Micropower circuits for low current drain
    • Average current ~ 45 microamperes
    • Long battery life
  • Two outputs
    • 0 to 3.5 volt logic output
    • Relay driver - can directly drive a remote relay
  • Programmable sensitivity setting
    • Adjusts detection range
  • Programmable dwell setting
    • Adjusts output ON time from 200 ms to 10 minutes
  • Only eight wire connections needed for all functions
    • Two for power
    • Two for outputs
    • Four for programming


Digital  Technology

 The Glolab DP-001A module uses a  Digital  infrared detector. This new technology incorporates a sensor, amplifier, filter, A/D converter in one TO5 package.

 Unlike typical analog pyroelectric sensors, the digital sensor outputs serial data pulses that represent the amplitude of detected infrared radiation in digital form. Since all of the amplification and signal processing is done within the sensor package, the detector has very high immunity to RF radiation from cell phones and other sources.

Below is a block diagram of the DP-001A module. Power is supplied to the sensor and the processor through a micropower voltage regulator. The processor decodes the serial bits from the digital sensor and turns both a logic output and relay driver on when motion is detected. The amount of time that the output remains on (dwell) can be programmed by an external resistor and can be set for one of ten times from 200 milliseconds to 10 minutes. Detection sensitivity that affects detection range can also be programmed for one of five sensitivity levels by an external resistor that is connected only during programming. The module is supplied with default settings of medium sensitivity and 1 second dwell time.

Zener diodes within the relay driver suppress voltage transients from inductive loads such as a relay or small motor. An LED or relay connected from +V to the relay output terminal will turn on when motion is detected.

A minimum of three wires must be connected to the DP-001A; two for power and one for output. Since all three wires carry only DC levels and not signals, the DP-001A module can be located remotely from the load that it drives.








Driving a microprocessor or logic circuit

Driving a microprocessor or other circuit. The logic output will be at 0 volts with no motion and will go to +3.5 volts when motion is detected. It will remain at +3.5 volts during the dwell timeout.






Driving a light emitting diode

A resistor is required in series with the LED to limit current. The resistor value can be chosen for the desired LED intensity. 



Driving a relay

The relay can be powered by the same source as the DP-001A module or by a separate source of voltage either lower or higher than the voltage that powers the DP-001A. If separate power sources are used, the negative side of both should be connected together and to -V (ground). The maximum voltage that can power a relay or other load is 28 volts.






Driving a vibrating motor


Driving a vibrating motor to provide a physical annunciation of a motion event. The vibrating motor can be remote from the DP-001A module, connected by wires. This is useful where an audible or visible indicator is not appropriate such as when detecting an approaching animal.






Driving a relay with multiple DP-001A modules

Two or more DP-001A modules can be bussed together so that multiple sensors can be used to detect motion in many directions and activate one load.




A Fresnel lens or other type of lens can be used with the DP-001A for long range detection.


See how to order

and view or print a complete manual for the DP-001A module. Manual includes functional description and application diagrams.

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Copyright 2015
Glolab Corporation