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Detect Pir
The Benefits of Exterior Porch Lights
The first thing visitors will notice about your home is its front side. When a visitor approaches your house, he or she will probably pass the front porch on the way to the front door. Your home's appearance says a lot about you, and surely you want your home to appear as a safe, beautiful place when guests arrive. Well chosen porch lights can make a dramatic change to your home's look with a very small investment, as well as creating a safer environment for guests at night time and improving your home's security.
Porch lighting is well known to deter thieves, vandals, and burglars from entering your home. Surely they do not want to be spotted in the light, so they choose to stay away from your home and instead prey on someone else's abode. The lights will also give your guests a warm welcome, as well as showing off your beautiful porch and porch awning at night time.
There are a wide variety of porch lamps to purchase on the market. If you have a large enough space for lamps, you could choose a Georgian pendant, or stainless steel if you prefer the look that is gives off. The key is to pick a style that best matches your porch and your surrounding home so that they look elegant and blend in well.
After installing your new lights, a smart idea is to equip your porch with a PIR sensor. These sensors will detect motion and turn the lights on because of it. It is a nice touch for invited guests who are walking down your front sidewalk, and an uninvited surprise for people who should not be walking across your lawn. Some wall lights have an integral PIR sensor, but if the lights you choose do not, you can install your own separately.
About the Author
Andrew Nowak is an expert author in the field of porch lighting. You can read more of his articles at Porch Awning Guide.
how to connect a PWM with 555 timer,2 limit switch,PIR sensor? i need to program it to sense a human body temp
the function is to make it detect a human body temp,and also i would need the circuitry of these device.
Hello pejanth;
I always try to provide SUCCINCT answers to technical questions, but I am having difficulty with yours. I observe, that this must be the FIRST question, you have posted in Yahoo Answers, (upon observing your profile), and encourage you to TRY, to make your questions more UNDERSTANDABLE.
I'm not at all sure, what it is exactly, you are trying to accomplish, other than to measure the temperature of a human body.
I find it intriguing, to combine the technologies of a pulse width modulator (PWM), implemented with a 555 timer (readily accomplished) and a PIR sensor (likely, you mean an infrared sensor) to implement, a body temperature measuring device. (The "2 limit switch", part is mysterious to me ?)
I encourage you to re-formulate your question, and give much greater detail as to what you are trying to do, so that we can be more helpful.
Is this a science fair project ?
You should also consider, posting such a question in ENGINEERING, rather than CONSUMER ELECTRONICS, as you are likely to reach more people, with in depth knowledge, of your topic. (There is a wealth of knowledge out there, and you need to learn how to tap it.)
But if your ONLY OBJECTIVE, is to build something that will measure body temperature using infrared sensing, I can offer this link to a device, (already implemented) that can do just that, and I know others also already exist:
http://intecasi.en.alibaba.com/product/50124812/50608922/home_use_testing_device/Infrared_Forehead_Temperature_Sensor.html
8051 Microcontroller based Human Motion Detection Project using PIR Sensor