How many days you can run your system by using a 9V battery ? Hardly 2 to 3 days.The main power consuming element in the board is led for power indication and the voltage regulator.So how can you run this system for a month or year by using a smaller battery pack ?All these possible by using some additional hardware and software. After connecting the battery, I measured the voltage across 5v and GND pin it is 4.97v which is safe for our operation. putting the wires on there makes a great difference.ĭuring the uploading of code,the board is powered by USB cable but when ever you want to use it in the real world,you need an external power is usually impractical to run long power cables out to the sensor’s location.So for external power supply battery is the best option I think.There are several types of battery exist in the market.So choose according to your choice.In this project I used 9V battery.A high capacity battery pack can be used for longer life.Ĭonnecting a 9V battery directly to the arduino board is some what tricky.Connect the positive terminal of the battery to the Vin pin of the arduino and negative terminal of the battery to the GND pin of the arduino. Just cut a piece of wire 6.8 inches long and solder it into that hole marked with ANT, on each module. Wavelength = Speed of light (c) / Frequency (f) The way to calculate the antenna length is to divide the speed of light by the frequency to calculate the wavelength, and divide that by 4 to get a quarter length. A small hole " ANT" is provided in the module to solder an external antenna. If you look carefully in to the RF transmitter and receiver module there is no external antenna included. Most of the people think the tiny spiral copper wire on the module is an antenna but in reality it is an inductor. Putting an antenna on only the TX or RX will greatly extend your range, but putting one on each will extend it even farther. The range without antennae is very limited. When there is motion in front of the sensor the LED will glow.You can see the message also by opening your serial monitor. In the software part I attached the pics for setting the board and serial port. You can also refer the fritzing schematic.īefore uploading the code set the correct board and serial port in the Arduino IDE. Of course your Arduino Uno also works fine.You can also use a Arduino mini Pro which cheaper than nano.As now I do not have a FTDI module to program the mini board I choose the nano board.īefore going to make the entire transmitter module check the PIR sensor and have a fun. Passive infrared sensors(sometimes called pyro electric detectors) detect this energy and give a signal to the ARDUINO.įor working of the PIR sensor you can click hereįor transmitter I used a Arduino Nano board to reduced the cost. Humans and animals both release infrared energy. They do not emit energy themselves, which is why they are called "passive". Passive infrared sensors work by measuring incoming infrared from human or animal. RF transmitter to transmit the data to the receiver You can see my new instructable ARDUINO MPPT SOLAR CHARGE CONTROLLER (version-3.0)Ģ.Arduino to process the data from PIR sensorģ. RECEIVER : Receive the data from transmitter and activate alarm system and camera or sending a sms etcģ.SOFTWARE : That operates the entire hardware used in this project. I divide the entire project in to 3 major parts ġ.TRANSMITTER : To sense the human motion and transmit the data to receiverĢ. You could use IR, but that has a limited range and can only work within a line of sight of the receiver.But using the cheap RF module we can communicate within the range of around 100m.Īt the end I will give you few tips to reduce the power consumption. My device uses a PIR motion sensor to detect the human motion and this information is transmitted without wire by using a RF transmitter-receiver module to give some sort of alert.I choose a RF module for wire less communication because compared to the existing wireless systems like blue tooth,XBee or WiFi ,it is user friendly and very cheap.You can get it from eBay less than $ 2. One of my friend always worried for his new born baby when sleeping on a bed but no one is there to monitor him.īy modifying few things in my device you can solve all these problems very easily. Few years ago my friend's new bike was stolen from the parking premises of our apartment.ģ. In this project I will discuss how you can make a cheap wireless home security system.Though during starting of this project the main objective was only for security alarm but later I found this device can be used to solve several problems.These are the few practical problems which I have faced in the past :ġ.
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