DIGILENT DIGIL 410-389 User guide

The Digilent Pmod PIR (Revision B) is a Passive Infrared Sensor for monitoring movement at low power. With
theEKMC1601111, you can detect movement up to 5 meters away.

Pmod PIR Reference Manual

Optimized low-power modes
High sensitivity center for small movements of small objects
Normal sensitivity center for larger movements of large objects
Detect movement up to 5 meters away.

Features

6-pin Pmod connector withGPIOinterface

The Pmod PIR is designed to digitally report movement up to 5 meters away.

The Pmod PIR communicates with the host board via theGPIO protocol.

Here is the process for getting motion data from the Pmod PIR in pseudoGPIOcode:

1. Power on the Pmod PIR and wait at least 30 s for circuit to stabilize.

2. Poll state of pin 1 on the J1 header to see when motion has been detected by the Pmod PIR.

The on-board potentiometer can be adjusted to alter the sample frequency.

The Pmod PIR is an ideal Pmod to use in long term motion sensing application. As a very low power Pmod between
measurements, long term data to measure motion can easily be collected.

VDD for the Pmod PIR must be within 3 V and 6 V to ensure that the on-board chips operate correctly; however, it is
recommended that Pmod is operated at 3.3 V.

Parameter Min Max U

Motion detected pulse width ~15 ~75

Circuit stability time 30

Header J1

Pin Signal Description

1 Motion Detected Pin toggles high when motion is detected by the sensor

2 NC NC

3 NC NC

4 NC NC

5 GND Power Supply Ground

6 VCC Power Supply (3.3V/5V)

Functional Description

Specifications

Interfacing with the Pmod

Quick Data Acquisition

Pinout Table Diagram

Circuit stability time when voltage is applied is 30 seconds.

The pins on the pin header are spaced 100 mil apart. The PCB is 1.2 inches long on the sides parallel to the pins on the pin
header and 0.8 inches long on the sides perpendicular to the pin header. Height is .55 inches on the sensor.

The schematics of the Pmod PIR are availablehere. Additional information about the passive infrared sensor can be found
in the datasheethere. Additional information about the multivibrator IC can be found in the datasheethere.

Example code and more specific information on how to use the Pmod PIR can be found on itsResource Center.

If you have any questions or comments about the Pmod PIR, feel free to post them under the appropriate section (“Add­on Boards”) of theDigilent Forum.

Physical Dimensions

Additional Information