Sparkfun PIR Motion Sensor (JST)

The PIR Motion Sensor (JST) is a user-friendly device that is designed to detect movement in a room. Once powered, it takes a snapshot of the room within 1-2 seconds. If any movement is detected after this period, the 'alarm' pin will go low, alerting you to the presence of motion.The device operates effectively within a voltage range of 5 to 12V, with a datasheet indicating optimal performance at 12V. However, if required, a jumper wire can be installed past the 5V regulator on board, allowing the unit to operate at 3.3V. The sensor consumes 1.6mA@3.3V.The 'alarm' pin of the sensor functions as an open collector, necessitating a pull-up resistor. This open drain configuration permits the connection of multiple motion sensors to a single input pin. If any sensor is triggered, the input pin will be pulled low.Sparkfun has made significant improvements to the connector of the PIR Motion Sensor. The previous "odd" connector has been replaced with a more common 3-pin JST, enhancing the accessibility of the sensor for diverse project requirements. The new connector features red for power, white for ground and black for alarm.With the PIR Motion Sensor, you can add an extra layer of security to your home or office, automate lighting systems, or incorporate it into interactive art installations. The possibilities are endless, and the user-friendly design makes it an excellent choice for both beginners and experienced tech enthusiasts.Sparkfun provides comprehensive support documents for the PIR Motion Sensor, including a datasheet and a hookup guide. These resources offer detailed information about the sensor and step-by-step instructions for setting it up, ensuring a smooth and successful user experience.