![]() ![]() You can use the output signal to trigger things like relays and LEDs. Using the HC-SR501 PIR motion sensor as a standalone unitįor most applications, you can just use the HC-SR501 as a standalone unit. Unfortunately, no additional information is provided in the datasheets, so I am not entirely sure about what component values you should use. Adding this makes the sensitivity of the sensor less dependent on the ambient temperature RT – This pad is meant for a thermistor.This causes the detector to be operational only when the detection area is sufficiently dark. RL – Here you can add a light dependent resistor (LDR) or photoresistor which has a low resistance under strong ambient light.The difference between the single and repeating trigger mode is shown in the figure below. Repeating trigger – Every time motion is detected, the delay timer is restarted.Any movement during this period is not processed and does not restart the timer. It will stay HIGH for the time set by the potentiometer. Single trigger – The output will turn HIGH as soon as motion is detected.It can be set to either L (single trigger) or H (repeating trigger): The (yellow) jumper can be used to select one of the two trigger modes. Turn the potentiometer clockwise to increase the delay and counterclockwise to decrease the delay. At a minimum, the delay is 3 seconds and at a maximum, it is 300 seconds or 5 minutes. This potentiometer can be used to adjust the time that the output stays HIGH for after motion is detected. Rotating it counterclockwise decreases the sensing distance to a minimum of 3 meters. Rotating the potentiometer clockwise increases the sensing distance to a maximum of 7 meters. You can adjust the sensing distance by rotating the sensitivity potentiometer CW or CCW (see picture above). The HC-SR501 has a maximum sensing distance (detection range) of 7 meters. HC-SR501 Specifications Operating voltageįor more information, you can check out the datasheets below: The specifications of the HC-SR501 are given in the table below, note that there might be small differences between manufacturers. This means you can power the board with a large DC voltage range, typically 5 V is used. On the PCB you can also find a built-in voltage regulator. If you remove the fresnel lens, you will see the RE200B pyroelectric sensing element. ![]() This IC is specifically developed to process the signal from PIR motion sensors. The HC-SR501 PIR motion sensor is built around the BISS0001 Micro Power PIR Motion Detector IC. All objects with a temperature above absolute zero (0 Kelvin / -273.15 ☌) emit heat energy in the form of infrared radiation, including human bodies. The pyroelectric sensing element can detect infrared radiation. PIR motion sensors consist of two main parts: a pyroelectric sensing element and a fresnel lens. As an Amazon Associate we earn from qualifying purchases. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on.
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