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Described security light circuit design is centered around an inexpensive passive infrared (PIR) motion detector module, type HC-SR501. The PIR motion detector module is used here with an added ambient light detection (day/night) feature, supported by a generic photodiode. yeah well i didn't make the sketch up there is a output pin to goes to the arduino digital pin and a vcc and a ground pin. all I'm trying to do is get it to come up slowly in PWM and when it's fully up stay on for 10 minutes and go back down in brightly slowly into it gets to 30% in brightness and then shut off or if someone keeps moving or doing something within that 10 minutes it still ... A PIR (Passive infrared) sensor can be used to detect these passive radiations. When an object (human or animal) emitting infrared radiations passes through the field of view of the sensor, it detects the change in temperature and therefore can be used to detect motion. HC-SR501 uses differential detection with two pyroelectric infrared sensors. It's only three wires, one from pin 4 (5v) to the +power pin of the PIR, one from pin 20 (GND) to the GND pin of the PIR, and one from pin 22 (GPIO 25) to the High/Low Output pin of the PIR. I've also tried using GPIO 14, 23, and 24 (pins 8, 16, and 18 respectively) for the input, and pins 14 and 20 for the ground. Dec 01, 2017 · The HC-SR501 is a low cost PIR sensor, available on Aliexpress. Let's look at the beast. This sensor is made for hobbyists, and is quite easy to use. Specifications. The datasheet can be found here. Sadly, this sensor is made for hobbyists, and consume around 50µA out of the box in standby mode (more than 200µA in active mode).