Pendent SOS Button for Women Along With Defence Bracelet

♦️Problem Statement:

Imagine your child walking home from school.

Suddenly, she finds herself in a dangerous situation and starts running in fear. She keeps running without knowing where she is going, until she reaches an unfamiliar place.

Now, she is alone. There is no one around to help her. She doesn’t know her location, and she has no way to contact her family or ask for help.

In such critical moments, every second matters.

This is where a smart safety system can make a life-saving difference.

♦️Equipments:

1. Pendent SOS button for women

Battery, A9G Board GPS Tracker, Sim Card, C3 Board Microcontroller, Voltage Regulator IC, SOS

Button, On of Off Switc

2. Defence bracelet

Slab Bracelet, Cutter

♦️Procedure:

A. Pendent SOS button for women

1. To make this project we are going to use A9G Board which comes with inbuilt GPS, GSM and built in

Battery Charging circuit

2. To give commands to this A9G Board we are using external microcontroller C3 Board.

3. To Power the above units we are using the Battery and Voltage Regulator IC

4. Also we are using SOS button and also we are using on off button

5. We are going to connect the above material as per Diagram shown above

6. We are attaching the code below where we are defining the emergency contact and the locations

module

B. Defence Bracelet

1. Any Bracelet in Market can be made Defence Bracelet

2. We Hide small cutter in that Bracelet which opens via switch. It have protection of plastic so it can

won’t harm the user

3. In the time of emergency anyone can use it till help arrives after pressing SOS button of Pendant.

♦️Working:

1. Pendent SOS button for women

For example, if a girl is walking alone on the road and feels someone is following her or if she feels

unsafe in any condition she can press the SOS button on this pendant for five seconds. Then her

current location will be sent to the person whose number we will select in code also they will receive

our call too so they can hear whats going on there and react accordingly. She can call them for

immediate help using this pendant.

2. Defence Bracelet

As per the above condition for Pendant she called her parents or police for help but in meantime, to

tackle that middle time till the help arrives she can use this Defence Bracelet for her protection. This

Bracelet will have cutter hidden inside it, which she can use for defence until the help arrives.

♦️Using this code, the system works effectively

#include "WiFi.h"

#define SOS D3

#define SLEEP_PIN D2 // Make this pin HIGH to make A9G board to go to sleep mode

boolean stringComplete = false;

String inputString = "";

String fromGSM = "";

int c = 0;

String SOS_NUM = "+91xxxxxxxxxx";

int SOS_Time = 5; // Press the button 5 sec

bool CALL_END = 1;

char* response = " ";

String res = "";

void setup()

{

// Making Radio OFF for power saving

WiFi.mode(WIFI_OFF); // WiFi OFF

btStop(); // Bluetooth OFF

pinMode(SOS, INPUT_PULLUP);

pinMode(SLEEP_PIN, OUTPUT);

Serial.begin(115200); // For Serial Monitor

Serial1.begin(115200, SERIAL_8N1, D0, D1); // For XIAO C3 Board

// Waiting for A9G to setup everything for 20 sec

delay(20000);

digitalWrite(SLEEP_PIN, LOW); // Sleep Mode OFF

Serial1.println("AT"); // Just Checking

delay(1000);

Serial1.println("AT+GPS = 1"); // Turning ON GPS

delay(1000);

Serial1.println("AT+GPSLP = 2"); // GPS low power

delay(1000);

Serial1.println("AT+SLEEP = 1"); // Configuring Sleep Mode to 1

delay(1000);

digitalWrite(SLEEP_PIN, HIGH); // Sleep Mode ON

}

void loop()

{

//listen from GSM Module

if (Serial1.available())

{

char inChar = Serial1.read();

if (inChar == '\n') {

//check the state

if (fromGSM == "OK\r") {

Serial.println("---------IT WORKS-------");

}

else if (fromGSM == "RING\r") {

digitalWrite(SLEEP_PIN, LOW); // Sleep Mode OFF

Serial.println("---------ITS RINGING-------");

Serial1.println("ATA");

}

else if (fromGSM == "ERROR\r") {

Serial.println("---------IT DOESNT WORK-------");

}

else if (fromGSM == "NO CARRIER\r") {

Serial.println("---------CALL ENDS-------");

CALL_END = 1;

digitalWrite(SLEEP_PIN, HIGH);// Sleep Mode ON

}

//write the actual response

Serial.println(fromGSM);

//clear the buffer

fromGSM = "";

} else {

fromGSM += inChar;

}

delay(20);

}

/ read from port 0, send to port 1:

if (Serial.available()) {

int inByte = Serial.read();

Serial1.write(inByte);

}

// When SOS button is pressed

if (digitalRead(SOS) == LOW && CALL_END == 1)

{

Serial.print("Calling In.."); // Waiting for 5 sec

for (c = 0; c < SOS_Time; c++)

{

Serial.println((SOS_Time - c));

delay(1000);

if (digitalRead(SOS) == HIGH)

break;

}

if (c == 5)

{

//------------------------------------- Getting Location and making Google Maps link of it

digitalWrite(SLEEP_PIN, LOW);

delay(1000);

Serial1.println("AT+LOCATION = 2");

Serial.println("AT+LOCATION = 2");

while (!Serial1.available());

while (Serial1.available())

{

char add = Serial1.read();

res = res + add;

delay(1);

}

res = res.substring(17, 38);

response = &res[0];

Serial.print("Recevied Data - "); Serial.println(response); // printin the String in lower character

form

Serial.println("\n");

if (strstr(response, "GPS NOT"))

{

Serial.println("No Location data");

}

else

{

int i = 0;

while (response[i] != ',')

i++;

String location = (String)response;

String lat = location.substring(2, i);

String longi = location.substring(i + 1);

Serial.println(lat);

Serial.println(longi);

String Gmaps_link = ( "http://maps.google.com/maps?q=" + lat + "+" + longi);

//http://maps.google.com/maps?q=38.9419+-78.3020

//------------------------------------- Sending SMS with Google Maps Link with our Location

Serial1.println("AT+CMGF=1");

delay(1000);

Serial1.println("AT+CMGS=\"" + SOS_NUM + "\"\r");

delay(1000);

Serial1.println ("I'm here " + Gmaps_link);

delay(1000);

Serial1.println((char)26);

delay(1000);

}

response = "";

res = "";

//------------------------------------- Calling on that same number after sending SMS

Serial.println("Calling Now");

Serial1.println("ATD" + SOS_NUM);

CALL_END = 0;

}

}

//only write a full message to the GSM module

if (stringComplete) {

Serial1.print(inputString);

inputString = "";

stringComplete = false;

}

}

♦️When Every Second Matters

Dream a Better World – Make It Heal

Imagine… a girl or a woman suddenly finds herself in a dangerous situation.

There is no one around to help, and every second becomes critically important.

In such moments, this project becomes a ray of hope.

Through a pendant SOS button and a defence bracelet, it provides immediate access to help during emergencies.

This project is not just about technology,

but a meaningful effort to build a sense of safety, confidence, and trust.

Because safety is not a choice… it is a right.