Introduction to HC-SR501 PIR Sensor

Hello, readers welcome to new post. Today we will discuss Introduction to HC-SR501 PIR Sensor. The full form of the PIR sensor is a passive infrared sensor. It is a less expensive sensor that is used to detect the existence of any person or animal near the located area. It comes in 3 pin structure for output which are VCC ground and output.

It has a 3.3 volts TTL logic pin so can be configured with any Arduino Raspberry and ARM or micro-controllers. In this post, we will discuss its working features and some other parameters. So let’s get started Introduction to HC-SR501 PIR Sensor

Table of Contents

HC-SR501 is an infrared operating module, it has automatic configuration and compatibility with the LHI778 design.
It is a highly reliable module that operates on lower voltages and is used in auto-sensing electrical devices such as battery-operating automatic controlled devices

It is also called a pyroelectricity infrared sensor that is used for the conversion of an infrared ray signal released through humans or animals into an electric signal.
It is a component that used in different ranges of automatic sensing electronic devices

HC-SR501 PIR Sensor Features

To enter the sensing ranges of output the human being moves away from the sensor operating range automatic delay off high and output gets low
Photosensitive control can be adjusted day or light intensity without the use of induction.
It has temperature compensation features in summer when ambient temperature changes thirty to thirty-two degrees the detection distance is small, temperature compensation can work for performance compensation.
It can be triggered in two modes: repeatable trigger and nonrepeatable trigger.
In non-repeatable trigger sensor output is high delay time passes the output is automatically varied from high to low level. The repeatable trigger has a high output delay period if human movement exists in the sensor range, the output will be high till left after the delay is high and the level will be low
It can operate for four to twelve volts
Its output voltage is high low 3.3V TTL
It has easily differentiated the object movement and human being
Its power consumption is sixty-five milliamperes
The operating temperature is minus twenty to plus eight centigrade

PIR Sensor Pinout Configuration

It has three pinout
VCC is the input voltage pin plus five volts are provided at this module and can handle four to twelve volts
High/Low Output Pin Digital pulse high for triggered and digital low zero volts when there is not a movement about the sensor
GND here the ground is connected

HC-SR501 PIR Sensor

This PIR sensor can operate from 4.5 to twenty volts normally five volts used. After getting the power it can get calibrated in some minutes about two minutes. After that output is measured in output input
There are two modes of operation in this sensor repeatable H and non-repeatable L. Repeatable mode is the default mode

Repeatable(H) mode

The repeatable mode is output pin Dout will be high if a person is passes through the range and it will be low after set time passes. In this mode output pin will be high irrespective of the person is existing outer side in the range. the sensitivity can be adjusted through the use of a sensitivity control potentiometer

Non- Repeatable(L) mode

In this mode output pin, Dout is high if human beings exist in range and it will be high till he stays in range. When a person left that region pin will be low after a certain time which can be adjusted through a potentiometer. Sensitivity control potentiometer used for sensitivity

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Instruction for use of PIR Sensor

The sensor module is powered up after a minute this starting period during this module will make output about zero to three times after that goes to standby mode
Must avoid the lights and other sources of interference close directly to the module surface of the lens, to avoid the existence of interference signal malfunction conditions must avoid wind flow that will interfere with the sensor.
The sensor module comes with a double probe, probe window is a rectangle-shaped dual AB in two ends of the longitudinal direction.
Therefore when human beings move in either direction left to right or right to left through the infrared spectrum to get a dual time distance difference the larger difference and the sensor is more sensitive
If the human body from front to probe or from upper to bottom or bottom to upper direction moves double detects variations in distance of less than infrared spectroscopy.
The dual direction of the sensor must be installed in a parallel configuration as in line with human motion. In a result increasing the sensor angle range module using a circular lens also creates a probe surrounding the induction