Loud Security Alarm Using PIR Sensor Module

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In this tutorial, we are demonstrating a project of a “Loud Security Alarm using PIR Sensor Module”. A loud security alarm is a structure intended to identify intrusion, unauthorized entry into a “building” or other areas such as school or home. Security alarms are used in private, industrial, business, and military properties for assurance against robbery or property damage.

There are numerous strategies to make a security alarm, for instance, it may be made by using touch sensors, laser systems, vibration sensors, infrared systems, and so on. Be that as it may, in this circuit, we have utilized a PIR sensor module to identify the entry of an individual in the limited zone.

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Hardware Component

The following components are required to make Security Alarm Circuit

S.no	Component	Value	Qty
1.	PIR Sensor Module	–	1
2.	IC	UM3561	1
3.	Resistor	10K, 180K, 120Ω, 4.7Ω 1W	1,1,1,1
4.	Transistor	BD140	1
5.	Speaker	8Ω	1
6.	DC Power Supply	5v-12v	1,1

UM3561 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of UM3561

Security Alarm Circuit

Working Explanation

In this section, we will talk about the circuit operation of the project “Loud Security Alarm using PIR Sensor Module”. The circuit is not using many segments. In this circuit, we are using PIR Sensor Module, IC UM3561, resistors, transistor BD140 and a speaker of 8Ω 2-5 Watt. The ”PIR sensor” utilized in the circuit will identify human IR radiations, when the sensor recognizes the human radiations, its output goes high and enacts the UM3561 IC. The UM3561 is a four-siren sound generator IC and in this circuit, we are just utilizing one of its sirens. At the output of the UM3561 IC, a BD140 transistor is utilized to intensify the yield alarm sound of the IC. The working voltage of the circuit is 5V to 12V DC.