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Pir sensor based security alarm system using um 3561 (2)

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PIR sensor based security alarm system

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Pir sensor based security alarm system using um 3561 (2)

  1. 1. PIR SENSOR BASED SECURITY ALARM SYSTEM USING UM 3561 By Ushaswini chowdary.M 14204115
  2. 2.  Generally, in security systems, infrared or laser transmitters and receivers are used. But these methods are cost effective.  This article explains about PIR based security system in which PIR sensor is used instead of transmitter or receiver.  This saves the power consumption and is low cost.
  3. 3. PIR sensor based security system principle  The main principle of the circuit is to provide security. This is based on PIR sensor with an IC that produces siren.  The PIR sensor detects the IR radiations emitted from the humans and it produces a digital output.  This digital output is applied to the UM 3561 siren IC. Thus it produces the sound when any human is detected.
  4. 4. Circuit diagram
  5. 5. Circuit components  PIR sensor  UM 3561 siren IC  Transistor NPN  Resistors R1,R2,R3,R4  Speaker 8 ohms  Battery
  6. 6. PIR sensor  PIR sensor is a passive sensor abbrevated as pyroelectric infrared sensor.  A pyroelectric infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.  It is important to note that PIR sensors don't detect or measure "heat" instead they detect the radiation from an object.
  7. 7. UM 3561  UM3561 is a low-cost, low-power CMOS LSI designed for use in alarm and toy applications  UM 3561 is a siren IC  It is a ROM IC  It generates multi siren tones like ambulance siren, fire engine siren, police siren, machine gun sound.
  8. 8. PIR sensor based security alarm system design  The proposed system mainly consists of PIR sensor, UM3561 IC, Speaker, transistors.  The UM3561 has 8 pins. Fifth and sixth pins are shorted and are connected to the PIR sensor output through a resistor.  One end of the 220K resistor is connected to the seventh pin of the IC and the other end is connected to the eighth pin of the IC.  Output is taken from the third pin of the IC.
  9. 9. Working of PIR sensor based security system  Switch on the circuit initially.  The PIR sensor is powered and it detects the IR rays emitted from any human.  This PIR sensor has a range of 5meters. One can adjust the pot provided for the sensor to vary this distance.  When any human is detected, this PIR sensor outputs a logic high value i.e. voltage of 3.5v to 5v.  This voltage is applied as input to the siren generator IC.
  10. 10.  The siren generator has an oscillator internally, to produce the sound.  Thus oscillations along with selected tone are sent to the address counter. The address counter then sends the data to the ROM.  ROM then sends the tone on the output pin 3.  The output is given to the NPN transistor to amplify the siren.  Thus sound produced can be heard from the speaker when human is detected.
  11. 11. Applications  This can be used in the museums to protect the valuable things.  This can also be used as an automatic door bell circuit that rings the bell when human is detected.  This can be used in defense applications to detect the humans in war field.  This can be used in toy applications that produce sound.

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