Arduino Panic Alarm Project

The circuit is an Arduino-based Panic Alarm. The wiring is straightforward, enabling even novices to construct this interesting circuit with ease. Arduino is a family of microcontrollers and a software environment (Arduino IDE) that facilitates the creation of programs, referred to as sketches, which can interact with the physical world. The Arduino environment is designed for beginners without prior software or electronics experience. However, it is advisable to learn more about the Arduino platform before constructing this circuit. For those new to Arduino, resources are available to assist in getting started. An active and supportive Arduino community can be accessed worldwide through forums, offering project examples and solutions to problems for inspiration and assistance. The Panic Alarm circuit consists of two essential components: a ready-made Arduino Microcontroller board and an interface circuit that can be assembled on a prototyping board. A standard 9V battery can power the entire circuit, and a Push-ON switch (S1) is used to activate the alarm function. Additionally, an Electro-Magnetic Relay (EMR) is connected to the interface circuit, enabling the energization of external high-power blinkers or beepers if necessary.

The Panic Alarm program is structured as follows: it defines the pin assignments for the relay, switch, LED, and piezo speaker. The setup function configures these pins for input or output as required. In the loop function, the program continuously checks the state of the switch. If the switch is activated (input is HIGH), the relay and LED are turned on, and a tone is played through the piezo speaker. If the switch is not activated, the relay and LED are turned off, and the tone is silenced. The playTone function generates sound by toggling the piezo speaker on and off at a specified frequency and duration.

The circuit design allows for flexibility in alarm signaling, accommodating various external devices that can be controlled via the relay. The integration of the Arduino platform not only simplifies the programming and hardware interaction but also provides a robust framework for expanding functionality, such as integrating additional sensors or communication modules for remote monitoring. This makes the Panic Alarm not only an effective personal security device but also a platform for further exploration and experimentation in electronics.Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that even a novice can construct this interesting circuit without any difficulty. Arduino is a family of microcontrollers (tiny computers) and a software creation environment (Arduino IDE) that makes it easy for you to create programs (called sketches) that can inter

act with the physical world. The Arduino environment has been designed to be easy to use for beginners who have no software or electronics experience. However, try to learn more/refresh your knowledge about arduino platfrom, before constructing this circuit.

If you are new to Arduino, this link will help you get started. In addition, there is an active and supportive Arduino community that is accessible worldwide through the Arduino forums. The forums offer project development examples and solutions to problems that can provide inspiration and assistance as you pursue your own projects.

Here is a simple Arduino guide for beginners Panic Alarm circuit consists of two equally important parts. The first part is the ready-made Arduino Microcontroller board, and the second part is an interface circuit which can be wired on a piece of prototyping board.

You can use any standard 9V battery to power the whole circuit, and the Push-ON (push n` hold) switch (S1) to activate the alarm function. An additional Electro-Magnetic Relay (EMR) is also attached to the interface circuit. With the help of this relay, it is easy to energize other (external) high-power blinkers or beepers, if necessary.

// PANIC ALARM - ARDUINO // // by T. K. Hareendran // int rlyPin = 12; // Relay Output Pin int sensPin = 2; // Switch Input Pin int ledPin = 13; // LED output Pin int pzSpeaker = 10; //Piezo-speaker Output Pin int val = 0; // variable for reading the Input Pin status void setup() { pinMode(rlyPin, OUTPUT); // Set Relay as output pinMode(sensPin, INPUT); // Set Switch as input pinMode(pzSpeaker, OUTPUT); // Set Piezo-Speaker as output pinMode(ledPin, OUTPUT); // Set LED as output } void loop(){ val = digitalRead(sensPin); // read input value if (val = HIGH) { // check if the input is HIGH digitalWrite(rlyPin, HIGH); // turn Relay ON digitalWrite(ledPin, HIGH); // turn LED ON playTone(500, 600); delay(100); playTone(500, 800); delay(100); } else { digitalWrite(rlyPin, LOW); // turn Relay OFF digitalWrite(ledPin, LOW); // turn LED OFF playTone(0, 0); delay(300); } } // duration in mSecs, frequency in hertz void playTone(long duration, int freq) { duration *= 1000; int period = (1. 0 / freq) * 1000000; long elapsed_time = 0; while (elapsed_time < duration) { digitalWrite(pzSpeaker, HIGH); delayMicroseconds(period / 2); digitalWrite(pzSpeaker, LOW); delayMicroseconds(period / 2); elapsed_time += (period); } }

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