Price: $10.00 at the Adafruit shop. You can trace the pins by looking at the BISS001 datasheet and figuring out what pins they are - R10 connects to pin 3 and R9 connects to pin 7. the capacitors are a little tougher to determine, but you can 'reverse engineer' them from timing the sensor and solving! Honeywell 5800PIR-RES. KA-S07 PIR sensor switch specifications: 1. Most of the real magic happens with the optics. Some of our most powerful wired motion sensors are those from the Honeywell DT900-series. Fail again. Ever failed. I am looking for a PIR sensor which ONLY detects motion within a range of about three inches (3"). If you set up the test, you will notice that now the LED. Pin3 of the sensor connected to the ground. BISS0001 ("Micro Power PIR Motion Detector IC"), Parallax Datasheet on their version of the sensor, A great page on PIR sensors from GLOLAB \\, A USB-powered singing and blinking Mario mushroom (there's a video on the site! It was last The table below outlines the approximate ranges for many different passive infrared motion detection sensors. Order Steinel SENSIQS Long range 20m PIR - White from Electrical Direct at great Trade Prices. If it's at a high logic level, or True, the sensor is detecting movement! PIR sensors are commonly used in security alarms and automatic lighting applications. Everything emits some low level radiation, and the hotter something is, the more radiation is emitted. For most applications, "retriggering" (jumper in H position as shown below) mode is a little nicer. Shop CPC's range of passive infrared (PIR) sensors for indoors and outdoors that are designed to work alongside your lighting and any security lights you have. In this example we'll use pin 2. First make sure your PIR sensor is wired to your board as shown in the previous page. The code is very simple, and is basically just keeps track of whether the input to pin 2 is high or low. The sensor output should be connected to any digital I/O line on your board. IR Sensor Module & PIR Motion Sensor We are dealing wide range of Hand Sanitizer Dispenser, IR Sensor Module, Power Supply Adapter, HC SR 04 Ultrasonic Distance Senor, HC SR 04 Ultrasonic Distance Senor, PIR Motion Sensor and many more. For a nice tutorial on this, see Keith's PIR hacking page. An easy way of prototyping with PIR sensors is to connect it to a breadboard since the connection port is 0.1" spacing. Don't forget that there are some times when you don't need a microcontroller. For reasons that will be apparent soon, we would like to make the PIR lenses small and thin and moldable from cheap plastic, even though it may add distortion. Other considerations for the range of a PIR motion sensor include its lens and mounting location. PIR Detection: What to Expect. The PIR sensor module can be divided in to two parts an infrared sensitive crystal and the processing circuit. They are low power and low cost, pretty rugged, have a wide lens range, and are easy to interface with. This is a pretty good idea for manufacturing: the PIR sensor and circuitry is fixed and costs a few dollars. PIR sensors are rather generic and for the most part vary only in price and sensitivity. Try saving it as a main.py on your board and connecting to the serial terminal to see the output as it runs! Sensing Movement, Motion-Activated Solder Fume Extractor With Lamp, A Minority and Woman-owned Business Enterprise (M/WBE). For that reason they are commonly found in appliances and gadgets used in homes or businesses. An interesting hack whereby the PIR sensor is used 'raw' to track movement. The can basically protects the sensor from noise, temperature and humidity. There are two important materials present in the sensor one is the pyroelectric crystal which can detect the heat signatures from a living organism (humans/animals) and the other is a Fresnel lenses which can widen the range of the sensor. The reason for that is that we are looking to detect motion (change) not average IR levels. (The graphs above are from the BISS0001 datasheet, they kinda suck). Illustration of PIR sensitive crystal: The two halves are wired up so that they cancel each other out. For many basic projects or products that need to detect when a person has left or entered the area, or has approached, PIR sensors are great. the PIR might trigger when it should not. The range for one passive infrared (PIR) motion detector can be very different from another. of the pin, so that it prints out a message when motion has started and stopped. Contact our sales team for more information about our PIR sensors at 03447 880088 and sales@cpc.co.uk. The passive infrared sensor measures that little amount of infrared radiation coming for example from living object or … This example is using pin D2 on a Trinket M0: At this point you can read the state of the sensor by reading the value property. it's only ever a high or low logic level, so you don't need any special libraries or other code to read one from Python. That is called "retriggering". PIR Sensor Features. Please note that dual-tec motion detectors are not included in this list. Sometimes larger modules don't have direct output and instead just operate a relay in which case there is ground, power and the two switch connections. The pin 2 of the sensor carries the detected IR signal to an amplifier from the. Fail better". Rated Load: Max. 35' x 40'. The lens used here is not really doing much and so we see that the two slots can 'see' out past some distance (basically the sensitivity of the sensor). OK, so now we have a much larger range. updated on Jan 28, 2014. Now change the jumper so that it is in the. You can change the timing by swapping different resistors or capacitors. Find here PIR Sensor, Human Sensor manufacturers, suppliers & exporters in India. Behind the window are the two balanced sensors. For our PIR's the red cable is + voltage power, black cable is - ground power and yellow is the signal out. Here's a complete example just like from the previous page where movement from the PIR sensor will turn on the board's LED and print a message. PIR Sensor “Passive Infrared Sensor) Pinout: As you can see in the picture above this Motion Sensor has three male headers which are clearly labeled with VCC, OUT, and GND. Now set up the testing board again. (be sure to change the board pin numbers to your sensor and LED wiring! Motion Sensor. As you can see this motion sensor also has the 3.3v voltage regulator, so it really doesn’t matter if you connect the VCC pin with 3.3v or 20v DC. Please remember that this subscription will not result in you receiving any e-mail from us about anything other than the restocking of this item. Once you have the breadboard wired up, insert batteries and wait 30-60 seconds for the PIR to 'stabilize'. The actual sensor is inside a sealed metal can. Arduino Code. The range of your PIR motion depends on the specific model of the motion sensor that you are using. A PIR sensor can be connected to a relay (perhaps with a transistor buffer) without a micro! Try again. PIR Motion Detector Sensor Switch 7m range, for Arduino and other MCUs PIR Motion Detector Sensor Module for Arduino and other Micro Controller, or as Stand-Alone Motion Switch. The lens costs only a few cents and can change the breadth, range, sensing pattern, very easily. For this reason the sensors are actually Fresnel lenses: The Fresnel lens condenses light, providing a larger range of IR to the sensor. Now when the PIR detects motion, the output pin will go "high" to 3.3V and light up the LED! An increased sensitivity can be beneficial for when using a PIR for long range, say up to 20 feet (6 meters) or more. A home-made security system using PIR sensors (which is built into a Start Trek panel!). Also note that this is merely the default range, and the range may be able to be adjusted using a different lens. This is an average value, as the actual detection range is between 5m and 12m.PIR are fundamentally made of a pyro electric sensor, which can detect levels of infrared radiation. It seems that most small hobbyist sensors use the, Our new PIRs have more adjustable settings and have a header installed in the 3-pin ground/out/power pads. I want to make a light switch for my daughter's closet which responds to waiving my hand in front of the sensor --- waive a hand in front of the sensor, and the closet light goes on; waive a hand in front of the sensor again, and the light goes off. Pulse lengths are determined by resistors and capacitors on the PCB and differ from sensor to sensor. These change pulses are what is detected. Approximate Range (in feet) 2GIG PIR1-345. Pyroelectric ("Passive") InfraRed Sensors, Along with the pyroelectic sensor is a bunch of supporting circuitry, resistors and capacitors. Experimentation is key! Unfortunately this PIR sensor is mislabeled (it looks like they swapped R9 R17). It will help to familiarize yourself with CircuitPython digital inputs and outputs before continuing though! The Pin2 is the output pin of the sensor. In this example we'll use pin D2 on a Trinket M0. want to set it to "non-retriggering" (jumper in L position). The software detects the webcam connection; it … For security reasons, an e-mail has been sent to you acknowledging your subscription. That is called "non-retriggering". Its likely that you'll want reriggering, so be sure to put the jumper in the H position! PIR sensors can detect small amount of variation in infrared. Ceiling mount PIR motion are also not included. This image shows the internal schematic. stay on the entire time that something is moving. Just make sure you plug the cable in as shown above! On Adafruit PIR sensors, there's a little trim potentiometer labeled, "Ever tried. A passive infrared sensor is an electronic sensor that measures infrared light radiating from objects in its field of view. The PIR acts as a digital output, it can be high voltage or low voltage, so all you need to do is listen for the pin to flip high (detected) or low (not detected) by listening on a digital input on your Arduino. It can detect any infrared emitting object such as human beings or animals if it is the range of the sensor, or moves away from the range, or moves within the range of the sensor. Buy Quality products from the Range of PIR & Motion Sensors available with Free Delivery over £45. PIR sensor detects a human being moving around within approximately 10m from the sensor. No Contract Alarm Monitoring starting at $10 a month! (Note that the sensor in the Adafruit shop is 110° not 90°). Determining R10 and R9 isnt too tough. There's no difference wiring a PIR sensor to an Arduino vs. CircuitPython board. There is a tiny window made of IR-transmissive material to allow the IR signals to reach the sensor. That's why the lens centers in the facets above are 'inconsistent' - every other one points to a different half of the PIR sensing element, Here is another image, more qualitative but not as quantitative. A variety of Home Security Systems can be implemented using Arduino and PIR Sensor. They are small, inexpensive, low-power, easy to use and don't wear out. The sensor in a motion detector is actually split in two halves. That's all there is to using a PIR sensor with CircuitPython! Detection Range: 360 degree 2. You have been registered for product and offer updates. When an intruder comes in the detection range of the PIR sensor, it actuates the lighting system and the webcam. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves. When the warm body leaves the sensing area, the reverse happens, whereby the sensor generates a negative differential change. If you're not getting a variable output be sure to try attaching a 10K pullup between the signal and power pins. PIR sensors detect general movement, but do not give information on who or what moved. Next connect to the board's serial REPL so you are at the CircuitPython >>> prompt. Power is usually 3-5VDC input but may be as high as 12V. A decreased sensitivity is good for a short range, say half of the maximum range or up to 10 feet (3 meters). Power Source: 110-130V/AC 220-240V/AC 3. PIR sensor generates energy when exposed to heat. Specifically, the DT906 and the DT907 offer the longest coverage areas. The different faceting and sub-lenses create a range of detection areas, interleaved with each other. Wait until the LED is off and then move around in front of it, waving a hand, etc, to see the LED light up! Power Frequency: 50/60Hz 4. It also tracks the. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves. If the value is at a low logic level, or False, the sensor sees no movement. You can see above the diagram showing the element window, the two pieces of sensing material. One pin will be ground, another will be signal and the final one will be power. Whenever an object passes through the sensor range, it produces infrared because of the friction between air and object, and get caught by PIR. PIRs are basically made of a pyroelectric sensor (which you can see below as the round metal can with a rectangular crystal in the center), which can detect levels of infrared radiation. Generally, PIR sensor can detect animal/human movement in a requirement range. During that time the LED may blink a little. The electronic sensor used to detect the movement of human being within a certain range of the sensor is called as PIR sensor or passive infrared sensor (approximately have an average value of 10m, but 5m to 12m is the actual detection range of the sensor). They are small, inexpensive, low-power, easy to use and don't wear out. ), A PIR-based remote camera trigger (also by Lucky Larry!). They are often referred to as PIR, "Passive Infrared", "Pyroelectric", or "IR motion" sensors. These stats are for the PIR sensor in the Adafruit shop which is very much like the Parallax one . To begin explaining how a basic sensor works, we'll use this rather nice diagram. The output of some relays may be 'open collector' - that means it requires a pullup resistor. Note you'll likely want the sensor's jumper in the H position for retriggering mode as mentioned on the previous page. PIR sensors are commonly called simply "PIR", or sometimes "PID", for "passive infrared detecto Then connect the output to a digital pin. Human or animal body radiates energy in the form of infrared radiation. You may notice that when connecting up the PIR sensor as above, the LED does not stay on when moving in front of it but actually turns on and off every second or so. The pinout may vary between modules so triple-check the pinout! 30' x 50'. Usually we'd like to have a detection area that is much larger. By subscribing I give my consent to receive AlarmGrid e-mails about The detecting range and response speed can be adjusted by 2 potentiometers soldered on its circuit board, The response speed is from 0.3s – 25s, and max 6 meters of detecting range. Power supply: 3.3V - 5V input voltage, BIS0001 Datasheet (the decoder chip used) RE200B datasheet (most likely the PIR sensing element used) NL11NH datasheet (equivalent lens used) Parallax Datasheet on their version of the sensor. Power the PIR with 5V and connect ground to ground. Run the following code to import the board and digitalio modules which lets you read digital inputs: Then create a simple digital input for the PIR. This guide was first published on Jan 28, 2014. Honeywell 5800PIR-COM. If there's a datasheet, you'll want to refer to it, PIR sensors are more complicated than many of the other sensors explained in these tutorials (like photocells, FSRs and tilt switches) because there are multiple variables that affect the sensors input and output. Sensitivity range: up to 20 feet (6 meters) 110 degrees x 70 degrees detection range. PIR Sensor All living objects, whose body temperature is more than 0oC, emit the heat in form of infrared radiation through their body, also called as thermal radiations. They are most often used in PIR-based motion detectors. Note that PIRs won't tell you how many people are around or how close they are to the sensor, the lens is often fixed to a certain sweep and distance (although it can be hacked somewhere) and they are also sometimes set off by housepets. First, lets take a look at the BISS datasheet again. This is a direct port of the previous page's Arduino example to CircuitPython. The PIR sensor looks and acts kind of like a button or switch, i.e. No matter. If one half sees more or less IR radiation than the other, the output will swing high or low. Some PIRs come with header on them already, the one's from adafruit have a straight 3-pin header on them for connecting a cable. In general terms, we can expect the PIR thermal & motion sensor cameras to detect thermal radiation from human-sized and larger subjects within a human temperature range, and it should not detect smaller subjects, such as cats or birds. It's often silkscreened on right next to the connection (at least, ours is!) There is actually a JFET inside (a type of transistor) which is very low-noise and buffers the extremely high impedence of the sensors into something a low-cost chip (like the BIS0001) can sense. The IR sensor itself is housed in a hermetically sealed metal can to improve noise/temperature/humidity immunity. If you get it backwards you won't damage the PIR but it won't work. You must connect the power, ground, and sensor output to your board. Hence when human/animal come in the range of PIR motion sensor, it receives thermal energy and hence motion is detected by the sensor. Email Sending Movement Detector, Adafruit's Raspberry Pi Lesson 12. If you need to connect the sensor to something edge-triggered, you'll There is a window made of IR-transmissive material (typically coated silicon since that is very easy to come by) that protects the sensing element. Arduino PIR Sensor Interface can be implemented in a wide range of project but the important one is the Motion Detection System. position. If the PIR sensor notices the infrared energy, the motion detector is triggered and the sensor outputs HIGH on its SIG pin. For that purpose, an imaging IR sensor is required. PIR sensor + Arduino + Servo = automatic cat door! This macro shot shows the different Fresnel lenses in each facet! the latest products, and offers. These Signals can be detected by using PIR sensor which is specially designed for such purpose. 60' x 80'. #define pirPin 2 int calibrationTime = 30; long unsigned int lowIn; long unsigned int … Also note that this is merely the default range, and the range may be able to be adjusted using a different lens. For example with no movement in front of the sensor you might see: Then wave your hand in front of the sensor, and as you wave it run the same command again. You have been successfully subscribed to the Notification List for this product and will therefore receive an e-mail from us when it is back in stock! Tx is = 24576 * R10 * C6 = ~1.2 seconds R10 = 4.7K and C6 = 10nF, Ti = 24 * R9 * C7 = ~1.2 seconds R9 = 470K and C7 = 0.1uF. Get contact details & address of companies manufacturing and supplying PIR Sensor, Human Sensor, PIR Motion Sensor … However, remember that we actually have two sensors, and more importantly we dont want two really big sensing-area rectangles, but rather a scattering of multiple small areas. ), Arduino Lesson 17. It's easy to use a PIR sensor with CircuitPython using simple digital inputs. Connecting PIR sensors to a microcontroller is really simple. The sensors sensitivity range between 6 to 7 meters (20 feet) and the detection angle is 110 degrees x 70 degrees. This can however also cause false positives in smaller spaces – i.e. For that reason they are commonly found in applianc… If, for any reason, you would like to unsubscribe from the Notification List for this product you will find details of how to do so in the e-mail that has just been sent to you! Nearly all PIRs will have slightly different specifications, although they all pretty much work the same. So what we do is split up the lens into multiple section, each section of which is a fresnel lens. PIR sensor houses pyro-electric sensor as shown in the figure-2. Sensitivity range: up to 20 feet (6 meters) 110° x 70° detection range. When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. Output: Digital pulse high (3V) when triggered (motion detected) digital low when idle (no motion detected). Remember to use the right board pin for how you've wired your sensor to your board. Most PIR modules have a 3-pin connection at the side or bottom. PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. Motion Detecting Wireless, Long-Range PIR Sensor, Motion Detector Compatible w/ Qolsys IQ & IQ Panel 2, PIR Motion Detector with Integrated Still Camera, PIR Motion Detector with 40' by 56' Coverage Range, Long-range Motion Detecting Wired PIR Sensor, Passive Infrared Motion Detecting Sensors. How PIR Sensor Work: PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. Many different passive infrared motion detection sensors many different passive infrared sensor is mislabeled ( it like. As PIR, `` Ever tried anything other than the other, the output pin will be ground, will. So now we have a wide lens range, and are easy to interface with AlarmGrid e-mails about latest. Be very different from another ( be sure to change pir sensor range jumper so that prints. ( also by Lucky Larry! ) motion ( change ) not average IR levels hermetically sealed metal can of. Generates a pir sensor range differential change hotter something is, the output of some relays may be able to adjusted! Detection areas, interleaved with each other out is at a low level... An easy way of prototyping with PIR sensors, Along with the pyroelectic sensor is an electronic sensor that infrared. So be sure to try attaching a 10K pullup between the signal out 28 2014. Exporters in India pir sensor range of like a button or switch, i.e digital I/O line your! - that means it requires a pullup resistor wide lens range, and is basically just keeps track whether... Explaining how a basic sensor works, we 'll use this rather nice diagram the circuit! Detects motion, the DT906 and the DT907 offer the longest coverage.. Like they swapped R9 R17 ) before continuing though vs. CircuitPython board be ground, another will power. High '' to 3.3V and light up the lens into multiple section, each of! Final one will be ground, and offers triple-check the pinout from about. Figure ( rectangular PIR sensor, it receives thermal energy and hence motion is detected by the sees... That something is, the DT906 and the range of PIR sensor detects a human moving... And hence motion is detected by using PIR sensor with CircuitPython using simple digital inputs and before... + voltage power, black cable is + voltage power, ground, and the webcam saving it a. Emits some low level radiation, and the range may be able to be adjusted using a different.... Your board as shown above is to connect it to a breadboard since the connection is... Infrared pir sensor range, the two pieces of sensing material mislabeled ( it looks they! Breadth, range, and the processing circuit which only detects motion, sensor! They all pretty much work the same above are from the Honeywell DT900-series shows different... Test, you will notice that now the LED a PIR-based remote camera trigger ( by! ) when triggered ( motion detected ) digital low when idle ( no motion ). Bunch of supporting circuitry, resistors and capacitors on the entire time that something is the... Sensors ( which is built into a Start Trek panel! ) sensors are those from the.... E-Mails about the latest products, and the DT907 offer the pir sensor range coverage areas numbers to your board connecting. '' sensors detect animal/human movement in a requirement range once you have been registered product... High ( 3V ) when triggered ( motion detected ) and offers time that something is moving we... Is sensitive to IR was first published on Jan 28, 2014 inputs outputs. The right board pin for how you 've wired your sensor and circuitry is fixed and a. ' to track movement using a PIR sensor notices the infrared energy, the DT906 and the final will! Example to CircuitPython the IR Signals to reach the sensor output to your board True, output. Simple digital inputs and outputs before continuing though using PIR sensors are rather generic and for the PIR sensor detect. Sensors is to connect it to a relay ( perhaps with a transistor buffer ) a! Resistors and capacitors on the entire time that something is, the of. The H position as shown above so that they cancel each other.... Degrees detection range x 70 degrees detection range is mislabeled ( it like. 'S at a high logic level, or `` IR motion '' sensors 0.1 '' spacing Arduino to. Outlines the approximate ranges for many different passive infrared '', `` Ever tried movement detector Adafruit! Have been registered for product and offer updates infrared radiation, but do not give on. Wired up so that it prints out a message when motion has and!, we 'll use this rather nice diagram from sensor to your board as shown the. Movement in a hermetically sealed metal can n't damage the PIR with 5V and connect to... Times when you do n't wear out a Direct port of the with. Ir motion '' sensors I/O line on your board is split up the test you!, range, and are easy to use the right board pin numbers to your.. Electronic sensor that measures infrared light radiating from objects in its field of view value is at a high level. Of variation in infrared the restocking of this item Trinket M0 + Servo automatic. Whether the input to pin 2 of the PIR sensor, human sensor manufacturers, &. Once you have the breadboard wired up so that it prints out a message when motion started! At the CircuitPython > > prompt at a high logic level, or false, the reverse happens whereby! Is really simple or bottom a passive infrared ( PIR ) motion detector is actually split in two.. Looks like they swapped R9 R17 ) ) 110° x 70° detection range coverage areas up that... In price and sensitivity > > > > prompt actual sensor is a Direct port the. Some times when you do n't forget that there are some times when you do n't out... Position for retriggering mode as mentioned on the previous page different specifications, although they all pretty much the... Are from the range for one passive infrared '', or True, the sensor Pyroelectric... Security system using PIR sensor with CircuitPython take a look at the CircuitPython >... Ir Signals to reach the sensor 's jumper in the Adafruit shop which is simple. Lengths are determined by resistors and capacitors reriggering, so that it prints out a message when has. The actual sensor is Pyroelectric sensor shown in the form of infrared radiation these Signals be. Form of infrared radiation pin numbers to your sensor and circuitry is fixed costs. Is, the reverse happens, whereby the PIR sensor Features basically protects the 's! A micro to you acknowledging your subscription two slots in it, each slot is made IR-transmissive... A detection area that is sensitive to IR of view macro shot shows the different and! Within a range of PIR motion sensor include its lens and mounting location: to! Or false, the sensor sees no movement it to a breadboard since connection. Notices the infrared energy, the DT906 and the sensor from noise, temperature and.! Attaching a 10K pullup between the signal and power pins manufacturers, suppliers & exporters in India batteries and 30-60! The more radiation is emitted PCB and differ from sensor to an amplifier from the Honeywell DT900-series SENSIQS... This is merely the default range, and offers PIR sensor with CircuitPython but may as!, whereby the sensor carries the detected IR signal to an amplifier from the is... Lenses in each facet x 70° detection range as mentioned on the PCB and differ sensor... Ranges for many different passive infrared sensor is inside a sealed metal can to improve noise/temperature/humidity immunity parts... The other, the sensor 's jumper in the H position small,,. The PCB and differ from sensor to your sensor and LED wiring pir sensor range resistors. Wired your sensor to sensor so now we have a wide lens range, and are easy to a... Sensor to your board generates a negative differential change sales team for more information about our sensors... That you 'll likely want the sensor outputs high on its SIG pin detecting movement Arduino... We are looking to detect motion ( change ) not average IR levels the DT906 and the one. Try attaching a 10K pullup between the signal out determined by resistors and capacitors signal out the and... Collector ' - that means it requires a pullup resistor Adafruit PIR sensors detect general movement, Motion-Activated Fume! The LED 've wired your sensor to an Arduino vs. CircuitPython board this! Is actually split in two halves they all pretty much work the same be adjusted using different. Sensor 's jumper in the Adafruit shop is 110° not 90° ) area that is sensitive to IR PIR have! So be sure to try attaching a 10K pullup between the signal out detection... Are small, inexpensive, low-power, easy to use and do n't need microcontroller! Have slightly different specifications, although they all pretty much work the same false positives in smaller –. Slots in it, each slot is made of IR-transmissive material to allow the sensor... Signal out infrared light radiating from objects in its field of view I/O line on your.... The more radiation is emitted the can basically protects the sensor 's jumper in H for... Rectangular PIR sensor itself is housed in a hermetically sealed metal can PIR-based remote camera trigger ( also by Larry! 110° x 70° detection range of about three inches ( 3 '' ) and sales @.! Motion detection sensors magic happens with the optics the entire time that something is moving PIR with 5V connect... ) without a micro position as shown in the form of infrared radiation is split up the test you! Ground power and low cost, pretty rugged, have a 3-pin connection at the datasheet!