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SimplyTronics PIR sensor



The PIR(Passive Infra-Red) Sensor is a pyroelectric device that detects motion by sensing changes in the infrared(radiant heat) levels emitted by surrounding objects.

ST-00031 SimplyTronics PIR Sensor front 1280x1280 new.jpg ST-00031 SimplyTronics PIR Sensor back1280x1280 new.jpg

Product Features

  • Single bit output
  • Small size
  • On-board LEDs
  • Power 3V to 6VDC operation 150uA idle, 3mA active(no load) current draw
  • 30mA active (0 ohm resistor) high current draw
  • Detect a person up to 30 ft away
  • Sensitivity adjustable
  • 90˚ detection angle
  • On-board light sensor, night enable mode
  • 4-pin SIP package perfect for breadboard-friendly projects (EN is an optional pin so you can connect the PIR using a standard servo extension cable)
  • Output is activated for about 3 seconds after motion is detected
  • Output stays activated for as long as motion is detected

Technical Details

  • Power requirements: 3.0V – 6.0V DC
  • Typical: 5V @ 3mA
  • Operating temp range: 0°C to +50 °C
  • Dimensions: 36.2 x 25.1 x 22.3 mm

Application Ideas

  • Security Alarm
  • Motion-activated nightlight
  • Holiday animated props

Warning: Voltage- and Static-sensitive Device

  • PIR Sensor is a delicate, static-sensitive device requiring proper voltage
  • Observe proper anti-static techniques when handling them.
  • Disconnect all power before connecting or disconnecting the module to a circuit.
  • Do not reverse polarity of the power connections, it could destroy the device.

Module Dimensions


Pin Definitions

Pin Symbol Type Function
1 GND Ground Ground(0V)
2 VCC Power Power supply
3 OUT Output PIR signaling; HIGH = movement/ LOW = no movement
4 EN (Optional) Input PIR enable(default); HIGH = Enable / LOW = Disable [can be left unconnected]

Indicator LED

Status Detail
On Power on warm-up
Movement detected
Off No movement detected


Symbol Description Minimum Typical Maximum Units
VCC Supply Voltage 3.3 5.0 6 V
ICC Supply Current(No load) 2.8 3 3.2 mA
GND Ground reference connection - 0 - V
VIH Signal high (input) 2.4 3.3 5.0 V
VIH Signal low (input) -0.3 GND 0.3 V
VOH Signal high (output) 2.4 VCC - V
VOL Signal low (output) -0.3 GND 0.3 V


  • Bottom view of PIR Sensor


  • Mode Setting
Symbol Mode Description
1 Night Only activated at night(Depends on the lightness of the environment)
2 All time Activated all the time(Disable the light sensor option)

  • Sensitivity Adjust
Direction Description
Counterclockwise Increase the trigger sensitivity
Clockwise Decrease the trigger sensitivity

Typical Application

Connect to 3.3V or 5V microcontroller. EN can be left disconnected (so you can use a 3-wire cable). Only use EN to turn off the sensor remotely for saving power.


R1 = 0~4.7K

Spectral Response

In most cases the PIR plastic lens will be exposed directly to the area that should be sensing so almost nobody would care about the spectral response of this PIR sensor. A couple of customers mentioned that they will have to enclose their whole projects behind some translucent material and they needed to know which kind of infrared (which wavelength) should be able to pass through their material.

This PIR sensor and the lens are optimized to work with IR light wavelength from 5.5 to 14 um. The graphic below shows the information in a graphic.


Resources and downloads