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Panic Alarm Circuit

In this project, I will show how to design and build a simple Panic Alarm Circuit using 555 Timer IC and a few other easily available components. This circuit can be used to activate an alarm in case of any emergencies.


There can be any sudden situation of panic. It could be because of an intruder entering our house or bad health status. Situations can be many for panicking and may vary from person to person.

During such emergencies, we might be unable to intimate to the people around us. In this article we shall see how to make a simple panic alarm, which can help us to intimate others regarding our bad situation without any delay.

Panic Alarm Circuit Diagram

Panic Alarm Circuit Circuit Diagram

Components Required

  • 555 IC
  • Resistor – 1KΩ
  • Resistor – 22KΩ
  • Resistor – 100KΩ
  • Capacitor – 10µF
  • 9V Battery
  • Push Button
  • Mini Buzzer
  • Breadboard
  • Connecting Wires


This circuit is made with a low cost hardware using IC 555 timer, buzzer, a few resistors and capacitors. It is made to be working reliably as it has simple to use and not so sensitive hardware like 555 timer, ceramic buzzer, capacitors, etc.

Although no exclusive arrangement is used to make any compensation for the variable parameters, the circuit by default is made to be robust and easy to use. It is very user friendly with a single button to be pressed to handle the panicking situation without any trouble.

Also get an idea about Working of Burglar Alarm Circuit


The IC 555 is used in the Astable mode with the frequency depending on the values of resistors R2, R3 and C2. The values of R2 = 100KΩ, R3 = 22KΩ and C2 = 10µF.

By substituting the given parameters in the respective formulas for IC 555 in astable mode, we get the following values. The frequency of operation of the circuit is calculated to be 1 Hz. By finding the time period of the circuit by using the frequency information, we get the time period of the circuit as 1 second. This means the circuit has a on -off repeating time period of about 1 second.

Panic Alarm Circuit Image 1

After analyzing the ON and OFF time period of the panic alarm circuit given above, we find that the circuit will remain on for about 0.845 seconds and off for about 0.152 seconds.

The circuit is in the disabled mode when the button is not pressed and hence the alarm will not function when the button is not pressed. Although the power supply will be supplied to the IC 555 all the time, the circuit will operate in the astable mode only when the IC is enabled. The IC is in the enable mode only when pin 4 of the 555 IC is given a high voltage.

This happens only when the button is pressed. The button can be made to have a plastic enclosure to have a better visibility and ease of access to it. For the purpose of demonstration, I have connected a simple Buzzer to the output of the 555 IC. 

Also Read the Post: Thermistor Temperature Sensing Alarm

33 Responses

  1. Can you please send me the details of the components used and the complete video mounting the circuit plz

  2. can I please send me step by step procedure in making this project or video….I need to do this for my mini project this semester

  3. How one can press on button if some one is too sick.Is there any possible to attach the sensing instrument like that if any person is sick immediately the buzzer will be ring without any touch?

    1. yes you can do that.
      for e.g,
      – temperature sensor module with an op-amp. (can be used for the person with fever)
      – Pulse sensor module for measuring heart rate (requires microcontroller for ease of use)
      – Galvanic skin response grove module. ( it used to measure the electrical conductance of the skin ) because sweat glands are controlled by the sympathetic nervous system that can be
      aroused by strong emotions. So, strong emotions will result in more sweating on the skin.
      – Myoware muscle sensor ( this sensor measures the electrical activity of a muscle, giving an output voltage between 0 and 5V (in case you’re powering up the sensor with 5V) depending
      on the amount of activity in a muscle ).

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