HS-S38P Human Body Sensor Module - PIR Motion Detector

The HS-S38P module is designed to operate at either 3.3V or 5V DC. You must connect it to a stable power supply within this range. Exceeding 5V may damage the onboard circuitry.

Connect the module's VCC pin to Arduino 5V, GND to GND, and the signal (OUT) pin to any digital input pin. The output is a digital high/low signal that can be read using digitalRead(). The module typically outputs HIGH when motion is detected.

No, the HS-S38P uses passive infrared (PIR) technology, which cannot penetrate solid obstacles like walls or glass. It requires a direct line of sight to the heat source and is best used in open indoor spaces. The built-in Fresnel lens defines its detection field of view.

While exact specifications vary, Generic PIR modules like the HS-S38P typically offer a detection range of up to 5-7 meters with a detection angle of approximately 110-120 degrees. Performance depends on the sensor's placement and the sensitivity of the internal pyroelectric element.

No external components are required for basic operation. The module includes all necessary signal conditioning. Some boards may have a potentiometer to adjust sensitivity or trigger delay. No user calibration is needed for standard motion detection applications.