Praveen from CircuitsToday has written up an article on interfacing PIR sensor to 8051 microcontroller:
PIR sensors are widely used in motion detecting devices. This article is about interfacing a PIR sensor to 8051 microcontroller. A practical intruder alarm system using PIR sensor and 8051 microcontroller is also included at the end of this article. Before going in to the core of the article, let’s have a look at the PIR sensor and its working.
Interfacing PIR sensor to 8051 microcontroller – [Link]
Motion sensing is the detection of the change in position of an object relative to its surroundings or vice versa. There are many kinds of motion detector methods: infrared, optics, radio frequency, sound, vibration, and magnetism. These methods differ from each other because each of them uses a different medium and detects different subject (e.g. sound: in Doppler effect, motion is detected by the change in reflected frequency).This project uses PIR (passive infrared) sensor to detect the change in radiation, this can be use on lighting control, temperature control, and motion detection since all objects with temperature above absolute zero emits heat energy in the form of radiation. The term passive refers to the fact that PIR devices do not generate or radiate any energy for detection purposes. It works entirely by detecting the energy given off by other objects.The D204B PIR sensor is used in this project, it contains a material that generates energy when exposed to heat/radiation. The MCP6H94 quad op-amp is used in two stages; amplifier and comparator. The weak signal from the PIR sensor will be amplified by the first two op-amp configured as amplifiers, the amplified signal is then fed to the last two op-amp configured as comparator. The BC548 NPN transistor acting as the switch will be triggered when the comparator’s output gets HIGH, further, switching the transistor will also trigger the relay that is connected to the load (light and/or alarm).
PIR Motion Sensor – [Link]
by talk2bruce @ instructables.com:
Using a Raspberry Pi, a Raspberry Pi camera module, a PIR motion sensor, a USB WiFi adapter, a handful of parts, and a couple of Python programs, you can construct a camera that will automatically snap photos or record short videos when something moves in front of the camera and will automatically upload the photos/videos to Dropbox. This instructable shows how to build a Raspberry Pi Motion Sensitive Camera.
Raspberry Pi Motion Sensitive Camera – [Link]
Project is based on Holteks IC HT7610A, which is a CMOS LSI chip designed for use in automatic PIR lamp, flash or buzzer control. It can operate in 3-wire configuration for relay applications. In our project we have used relay instead of Traic to connect any kind of load in output, HT7610B IC is suitable for traic and HT7610A for Relay application. The chip is equipped with operational amplifiers, a comparator, timer, a zero crossing detector, control circuit, a voltage regulator, a system oscillator, and an output timing oscillator.
Its PIR sensor detects infrared power variations induced by the motion of a human body and transforms it to a voltage variation. If the PIR output voltage variation conforms to the criteria (refer to the functional description), the lamp is turned on with an adjustable duration. The circuit doesnt required step down transformer and can work directly by applying 110V AC or 220V AC (Capacitor C7 needs to change for 220V AC (0.33uF/275V) and 110V AC (0.68uF/275V)
PIR Sensor – [Link]
by MakerSpark Industries @ instructables.com:
This Instructable is about how to create an Arduino PIR motion sensor for your room or office, using parts available from your local Radio Shack! Whether you’re looking for a cool and easy-to-build security sensor, or an awesome first project to dive into the world of Arduino, Microcontrollers, and electronics, this project is for you. (This project really is easy. Take it from me, I’m 12, and I’ve only had my Arduino for a week and a half.)
Arduino PIR Motion Sensor – [Link]
by brmarcum @ instructables.com:
I hate Christmas tree lights.
Well not really, I just don’t enjoy having to climb under the tree every time I want to plug in or unplug the lights. In the interest of saving my sanity, I decided to build a motion activated switch that can power the lights for me. It has an integrated adjustable timer so they will stay on for as long or as short as I want. Here’s a video showing the final test on the fish tank light.
Motion Activated AC Switch – [Link]
New movement detectors (PIR) represent a Professional solution with up to 30 m range and wide possibilities of assembly.
On the market, there are many movement detectors based on a PIR sensor. For a simple usage, like for example lighting of a garage entry. Probably, it´s not necessary to use a top quality sensor with exactly defined specification and with wide possibilities of adjustment if you´d like to use it for example for a simple lighting of a garage entry. But a for a frequented corridors, security devices, lighting switching, … it´s surely beneficial if having a detector which we can rely on. Detectors from company Finder belong to such category. Finder offers five basic series:
● 18.01/18.11 – detector with a wide detection angle and a universal assembly with a possibility of an easy selection of a spce to survey. Typ 18.01 is suitable for indoor applications, 18.11 also outdoor.
● 18.21/18.31 – detector for ceilings with a surface or recessed assembly
● 18.41 – detector for hotel or office corridors, up to 30x4m range (depending on a height of a ceiling)
● 18.51 – highly sensitive ceiling type with a square detection pattern (up to 8x8m), suitable for schools, offices and also low activity zones. High sensitivity enables operation in 2 modes – “presence” and “movement”. In this case even a minimum movement, like for example a work on a PC is sufficient to activate the detector. Such a sensitivity can help to prevent for example an unwanted locking of building and activation of alarm, when you already think, that there´s nobody inside (but in fact, somebody is still there :-)).
● 18.61 – specific product for a wall assembly, 180° angle of survey, detects a half-circle with up to 18m diameter.
All types have elements for adjustment – ambient light sensitivity and a switch-on time of a contact (from a last detection). New types – 18.41, 18.51 and 18.61 also have the third adjusting element – sensitivity of the sensor itself. Thanks to them, it´s possible to adjust a detector to meet requirements of a given application. Logic of switching is an “addition”, i.e. if in time of a switched-on contact occurs another detection, the sensor will prolong the switch-on time for the selected time, i.e. no switch-off of the output contact (neither a short one) will occur. All types are designed for mains applications (96-253VAC) and they have a relay output (10A contact). Contact at types 18.41, 18.51 and 18.61 is also able to switch 400VAC.
Types 18.41, 18.51 and 18.61 are supplied with a rich set of accessories enabling a comfortable and aesthetic mounting as suspended ceiling, recess mounting (for example into a wall) and surface mounting.
Detailed information will provide you the Finder 18.01-31 and Finder 18.41-61 datasheets as well as the Finder 18 flyer (DE) and the attached video.
Detectors Finder will detect you even if you don’t move – [Link]
Boris Landoni writes:
It’s small but packed with features. The GSM alarm we present today, sports a PIR motion sensor, can be battery operated and it’s capable to communicate via GSM. It can transmit alarm conditions and receive commands from remote. It’s also capable to indicate problems such as is insufficient voltage supply or tampering.
It’s not so conventional for antitheft system: to integrate a movement sensor, a PIR motion sensor and a temperature probe in a single appliance: all this accompanied by an SMS sending GSM / GPRS module. This circuit was born as a very versatile, ready to use, built-in alarm system: no installation is required, you can just drop it and it’s ready to work. It’s not by chance that is designed to be battery operated: it also features a battery state control to check the power.
GSM Multifuction Alarm with SIM900 – [Link]
I have recently stumbled upon some LED strip at my local electronics shop and decided to give them a try. I bought some which I used to replace the spot lights in the kitchen. It is cold white, which is surprisingly good, especially for night time illumination (think moonlight like hue). It works at 12V and consumes about 0.25A per meter.
After installing the strip, some automation proved to be necessary, and so the following circuits were built. The goal in mind was to keep things as simple as possible and use only parts I had at hand, which is why the solution might not be the best.
The hallway spotlights got new white LEDs as well and a light sensor. Tiny PIR sensors will turn on the lights in the kitchen and bathroom when someone comes in range. The sensors are rather popular modules using a BISS0001 IC; they provide a 3.3V level for an adjustable time when motion is detected.
Overall the results are great. The hallway is lit at night, the there is a small automatic light for the bathroom and the automatic kitchen light is bright enough even for day time illumination of the sink and counter. The slow turn off provides both a visually pleasing effect and a warning in case someone stood still long enough to make the light go off. I am still looking for a simple solution to produce the same effect on turn on, but without the delay.
Fun with LEDs – [Link]
This project describes a motion sensor alarm based on a Passive Infra-Red (PIR) sensor module. There are many vendors that manufacture the PIR sensor modules and almost all of them are pretty much the same in function. They have a single output that goes high (or low, based on specification) when the motion is detected. In this project, a PIC12F635 microcontroller continuously monitors the output from the sensor module and turns a buzzer on when it goes active.
Motion detection alarm using a PIR sensor module with a PIC Microcontroller – [Link]