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electrobob.com writes:
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]
embedded-lab.com writes:
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]
dangerousprototypes.com writes:
Deepak from Mindfront.net acquired a PIR alarm sensor module which transmitted a digital code over 433 MHz RF to signal an alarm receiver. The problem: he didn’t have the factory receiver. So he set out to sniff the transmitted RF signal using a RCR-433-AS receiver module with the data out fed into an oscilloscope. This allowed him to monitor the digital coded signal pattern and decode it into individual bits.
Hacking a PIR RF signal with PIC 12F683 – [Link]
dangerousprototypes.com writes:
Sometimes it’s handy to have a message display when persons enter a specific area. Having the message appear only when someone approaches brings more attention it, and can be useful for holiday displays, directions or warnings. In this project by Jer from Volts and Bytes, an Atmega8 is used to activate a Sure Electronics 0832 LED matrix display when motion is detected by the attached PIR sensor.
The C source and supporting files are available in this zip file.
PIR controlled LED matrix display – [Link]
This project describes an automatic light system for kitchen sink where you need sufficient light to properly clean your dishes and vegetables. It uses an ATTiny84 microcontroller with a PIR motion sensor. When motion is detected, the microcontroller turns on the light. The light source consists of 10 bright white LEDs that are driven by a IRF612 MOSFET. One advantage of using a microcontroller is you can create light fade-in and fade-out effects using PWM. [via]
Automate lights in your kitchen area – [Link]
embedded-lab.com writes:
This entry for the 555 timer contest is from Andrew Smith who built a motion activated switch for a digital camera. The 555 timer is operating in monostable mode which is triggered by a PIR sensor when motion is detected. The monostable output of 555 then activates the camera through a remote.
555 Contest Entry: Motion activated camera – [Link]
Jeri (with an I) is back with a new amazing video. This time, she was asked to design a circuit to trigger “artistic” events, when someone approaches. The device had to be inexpensive and small. So Jeri used a PIR sensor to do the job. Watch the following video to see her explaining how these sensors operate and also how can someone use them in a circuit to detect the infrared radiation of our body heat. [via]
Proximity sensor using PIR sensor+theory – [Link]
Jer writes:
Recently, I tested the 0832 LED Matrix Board that I purchased from Sure Electronics. Since I have a simple AVR microcontroller breakout board and a PIR sensor that senses motion, I decided to make something fun using the 0832 LED Matrix Board.
Motion Activated Message Display – [Link]
This project demonstrates how pyroelectric IR sensor can be applied in the detection of moving object. Passive IR detector does not emits any IR light by itself. It is triggered by the variation of IR light that comes from warm & moving objects such as human body. Dogs, cats & other household pets have smaller bodies & do not radiate sufficiently strong IR to trigger the detector. Therefore it is pretty well immune to false alarm caused by pets.
PIR Motion Detector - [Link]
PIR sensor modules are popular among hobbyists as they are inexpensive, easily available, and are easy to interface. This project describes how to interface a PIR sensor module with a PIC microcontroller to make a motion sensor alarm system. The PIC12F635 microcontroller continuously monitors the sensor output and when the motion is sensed, triggers the alarm.
Motion sensor alarm with PIC Micro - [Link]
