Passive Infrared (PIR) Sensor Module

Key Specifications:

• Operating Voltage: 4.5V – 20V DC (Some versions 4.8V-20V or 5V-12V).
• Detection Range: Typically 3-7 meters (adjustable), sensitive to warm bodies (people, animals).
• Detection Angle: Around 110° to 120° cone.
• Output Signal: Digital TTL (High = 3.3V for motion, Low = 0V).
• Delay Time: Adjustable from ~0.3 seconds up to 5 minutes (or more).
• Sensitivity: Adjustable via potentiometer (clockwise increases range).
• Trigger Mode:
  • Repeatable (H): Output stays high as long as motion is detected (after initial delay).
  • Non-Repeatable (L): Output goes high for the set delay and then low, even if motion continues (good for power saving).
• Power Consumption: Very low static current (<50uA or <65mA depending on module).
• Components: Uses LHI778 probe and BISS0001 IC on many models.
• Temperature Range: -15°C to +70°C.

How it Works:

It detects changes in infrared radiation (heat) from objects. When a warm body moves into its field of view, the sensor detects this IR change, triggering a high signal on the output pin. Adjustments via potentiometers allow tuning range and the duration the output stays high after motion stops.