Winsen ZRD-09 Human PIR Motion Sensor Module - 5-20V DC, 100° Angle

The module provides a digital high/low output. A detected motion event triggers a high-level output of approximately 3V. In the idle state, the output remains at a low level near 0V. This TTL-compatible signal can be directly read by microcontroller GPIO pins on platforms like Arduino or ESP32.

In repeatable trigger mode, the output will activate for the set delay period each time motion is detected within that time, effectively extending the 'on' time. In non-repeatable mode, once triggered, the output remains active for the full delay period, ignoring any further motion until the timer resets, which is useful for preventing rapid cycling in applications like light switches.

The LIGHT pin connects to an onboard photoresistor. When this pin is set to a specific logic level (typically connected to enable/disable), it allows the module to operate only in low-light conditions, disabling detection during daylight. This feature is essential for automatic night lights or security lights that should only activate after dark.

No. The ZRD-09 requires a minimum operating voltage of 5V DC as per its specifications. While its output high level is around 3V, which is safe for 3.3V logic inputs, the power supply must be within the 5V to 20V DC range for reliable sensor and regulator circuit operation.

The module typically includes onboard potentiometers for adjustment. One potentiometer controls the sensitivity, which directly influences the maximum detection range (4-8m). A separate potentiometer sets the output hold time (delay) from 3 to 300 seconds after a trigger event. Adjustments require a small screwdriver while monitoring the module's response.