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Arduino Wireless Alarm System Using Existing Sensors: This project can be built in about half an hour at a cost of about $20.00 if you have existing 433Mhz or 315Mhz wireless alarm sensors. It can also be a complete new project with wireless alarm sensors…1. Some images above of the supplies you will need for this project2. Piezo between pin 5 of the Arduino and earthLED between pin 8 of the Arduino and to a 220ohm resistor then to earth433 or 315 Mhz receiver, VCC...3. The Arduino Sketch to run the alarm uses some libraries that are not already installed on the Arduino IDE by default.To add RCSwitch library to...4. I have provided the template of the Arduino code below but you will need to find the values for each of your sensors and paste them into the cod...5. Below is a copy of my Arduino code as a .ino file called Wireless_Alarm. You can click on it and it should open in the Arduino IDE. I am not a p...6. Now the steps to customize the code for the sensors and remote keyfobs you are using.If you open the Wireless_Alarm sketch in your IDE you will...7. With the Arduino still connected to your PC by USB upload the sketch to the Arduino Board. Once the upload is successfully completed the LCD sho...8. Hopefully your RTC was already set with the correct time but if not open the IDE, select 'File" and from the dropdown click on "Examples", scrol...9. When selecting a 433 or 315 MHz receiver module for Arduino you should pick the frequency to match the alarm sensors you intend to use. I sugges...HX1838 VS1838 Arduino Infrared IR Wireless Remote Control ...

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