The PIR (Passive Infra-Red) Sensor is a pyroelectric device that detects motion by measuring changes in the infrared (heat) levels emitted by surrounding objects. When motion is detected the PIR Sensor outputs a high signal on its output pin. This logic signal can be read by a microcontroller or used to drive an external load. Dual output modes and a sensible design that performs within stated datasheet specifications are a few reasons over 100,000 units are in use around the world.

Both revisions of this sensor use the same Fresnel lens, and basic functionality remains the same between the two (for example you can use the same test programs). However, there were a number of improvements and updates made to Revision B, and if using Revision A in your project the following
information should be noted and used.

Features:

• Detection range up to 20 feet away
• Single bit output
• Jumper selects single or continuous trigger output mode
• 3-pin SIP header ready for breadboard or through-hole project
• Small size makes it easy to conceal
• Compatible with BASIC Stamp, Propeller, and many other microcontroller

Key Specifications:

• Power Requirements: 3.3 to 5 VDC; >3 mA (may vary)
• Communication: Single bit high/low output
• Operating temperature: 32 to 122 °F (0 to 50 °C)
• Dimensions: 1.27 x 0.96 x 1.0 in (32.2 x 24.3 x 25.4 mm)

Key Differences:

• Jumper setting controls triggering and not distance
• Driving an external load requires a transistor or MOSFET
• Detection range up to 20 ft. away

Downloads & Resources:
PIR Sensor (Rev A) (.pdf)