RF wireless allarm magnetic switch PIC16F84

Posted on Jan 23, 2013

This circuit was formed to create a wireless alarm from a normal magnetic contact. By fixing the magnet to the leaf of a door, or swing of a drawer, it is easy to reveal the opening. To transmit the signal to a control anti-theft we modify the circuit of a remote control to activate it only for as long as necessary . Without the change, leaving the door open for the batteries would run out in a few hours! This transmitter is powered by a battery of 9 volts for a period of one year. You can connect to any kind of contact , including that of infrared sensors (PIR) to create a wireless burglar alarm. Every time one of its three entrances is closed, is a radio code to entremets Nutchip or any other circuit compatible with the encoding MM53200 , UM3750 or UM86409 . This diagram illustrates a remote fixed codes , ready to work immediately without adjustments. Moving a jumper, you can also get codes like.

RF wireless allarm magnetic switch PIC16F84
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The circuit is powered by a battery of 9 volts, connected to the terminal ends of the M1. The negative terminal of the battery goes to "mass", while the positive comes in integrating IC2 , which stabilizes the voltage to 5 volts. IC2 78L05 is equivalent to the more common, but has a much lower consumption making it ideal for battery applications. IC1 is the heart of the transmitter, a microcontroller PIC16F84, the legendary American company integrated Microchip , which is programmed with the software "picrmt.bin" . The foot DEFAULT (2) is connected to a jumper (JP1) by linking two three will get the codes pre-programmed into the chip, instead of connecting two three will get the code (to be included with the ' special procedure ). Each of the three inputs (terminals M2, M3 and M4) has an RC network (respectively R3-C5-C6 R4, R5-C7) Interval timer that action. A simple network delay (R1, C1) provides the RESET power. The power to reach 5Volt IC1 through the legs 14 (+5 V) and 5 (ground). The capacitor C2 (weld as close as possible to the pin of IC1) clears any feeding problems. The clock is generated by OSC1, a ceramic resonator 4MHz 3-pin: to use to use a quartz (2 feet), you add two small capacitors as shown in the diagrams of the base Nutchip. The foot RF (3) connected to the positive way in the radio chip. The foot LED (17) driver LD1 is turned on at each transmission. The pulses leaving the pin OUT (18) and go to...

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