Push Button to Send SMS with GPS Location [i.e., Panic Button]

Adafruit has an awesome tutorial on properly wiring and testing your Fona808; you can find it (here). If you want a description of the chip components and required accessories, you can find that (here). This tutorial is based on wiring to an arduino, so make sure you look at the correct tutorial (i.e., not the USB version).

THE CIRCUIT:

WHAT YOU NEED:

ADAFRUIT FONA808
Lithium Ion Polymer Battery-3.7V 1200mAh (required for FONA808 to work–no exceptions!)
Passive GPS Antenna uFL 9mm x 9mm (highly recommended)
Slim Sticker-type GSM/Cellular Quad-band Atenna (required for FONA808 to work–no exceptions!)
2G SIM CARD (required for FONA808 to work–no exceptions!)
ARDUINO UNO R3
BREADBOARD
RGB LED
SIMPLE PUSH BUTTON
330 OHM RESISTOR (3)
10 OHM RESISTOR (1)
JUMPER WIRES (15)
SOLDERING KIT

PART I | Getting Started

1.1 ASSEMBLY

A) Soldering: You must solder the FONA808 to the header strip or it will NOT produce stable electrical contact (and, therefore, will not work). If you’ve never done this before, check out Adafruit’s guide (here) and/or watch this video. I thought I could skip this step, but alas…

B) Wiring: (based on Arduino UNO)

Vio connects to 5V
GND connects to GND
Key connects to GND (always on)
RX connects to digital 2
TX connects to digital 3
RST connects to digital 4
PUSH BUTTON connects to digital 8 (with 10 OHM RESISTOR)
RGB LED connects to digital 9,10,11 (with 330 OHM RESISTORS)

(see image above)

1.2 TEST HARDWARE

C) DOWNLOAD FONA 808 LIBRARY (here) and perform a hardware test (here).

PART 2 | THE CODE

A) BEFORE RUNNING THE CODE

UPDATE the phone number that you want the text sent to (I’ve removed mine). There are two locations where you will have to make this change. (see image above)
Upload the code (below) to your arduino uno.
Open the serial monitor.

B) RUN THE CODE

/*
 * Panic Button!
 * A way to silently alert authorities or someone who can   help with your GPS location.
 
  Created 20-11-2017
  By Deon P.

  The tutorial can be found at:
  http://www.sensingthecity.com
 
 */
 
#include "Adafruit_FONA.h"
#include <SoftwareSerial.h>
#define FONA_RX 2
#define FONA_TX 3
#define FONA_RST 4

#include <SoftwareSerial.h>
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);
SoftwareSerial *fonaSerial = &fonaSS;

// Use this for FONA 800 and 808s
Adafruit_FONA fona = Adafruit_FONA(FONA_RST);

//for replies later
char replybuffer[255];
uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);
uint8_t type;

const int buttonPin = 8;  // pushbutton  pin

//RGB pins
const int RED_PIN = 9;
const int GREEN_PIN = 10;
const int BLUE_PIN = 11;

void setup() {
  while (! Serial);
  Serial.begin(115200);
  Serial.println(F("Initializing FONA... (May take a few seconds)"));

  fonaSerial->begin(4800);
  if (! fona.begin(*fonaSerial)) {
    Serial.println(F("Couldn't find FONA"));
    while(1);
  }
  Serial.println(F("FONA is OK"));
  // Try to enable GPRS

  Serial.println(F("Enabling GPS..."));
  fona.enableGPS(true);
  delay(4000);
  
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void loop() {
      //BLINK RED LED TO SIGNIFY PRE-SMS-SEND (NORMAL) STATUS
      digitalWrite(RED_PIN, HIGH);
      delay(1000);
      digitalWrite(RED_PIN, LOW);
      delay(1000);
  
  int buttonState;    
  buttonState = digitalRead(buttonPin);

  //if holding down button (i.e. panic)
  if (buttonState == LOW)  {

      //get gps location        
      
      float latitude, longitude;//variables to hold initial GPS readings
      boolean gps_success = fona.getGPS(&latitude, &longitude);
      if (gps_success) {
        Serial.print("GPS lat:");
        Serial.println(latitude, 6);
        Serial.print("GPS long:");
        Serial.println(longitude, 6);

      //send sms
      char message[141];  
      char LAT1[10];//string of lat and long unparsed & overflowing bound
      char LAT[10];
      char LONG[10];
      dtostrf(latitude, 10, 7, LAT1); //gathering GPS data in a format that can be sent
      dtostrf(longitude, 10, 7, LONG);
      
      //initialize desired array from unparsed array
      for(int i = 0; i < 9; i++) {
      LAT[i] = LAT1[i];
      }
      LAT[9] = '\0';//truncate array at last desired value
      sprintf(message, "I JUST PUSHED MY PANIC BUTTON! I NEED HELP NOW! https://www.google.com/maps?q=%s,%s", LAT, LONG);
      
      Serial.println(LAT);Serial.println(LAT1);Serial.println(LONG);
      Serial.println(message) ;    //prints the message in the serial monitor before sending

      char sendto[13] = "+19999999999"; //put the desired destination phone number for sms here

      fona.sendSMS(sendto, message) ; //sends the message via SMS}

      //BLINK BLUE LED FOR 30 SECONDS TO NOTIFY THAT TEXT SENT
      for (int i = 0; i < 30; i++){
      digitalWrite(BLUE_PIN, HIGH);//keep blinking light red
      delay(1000);
      digitalWrite(BLUE_PIN, LOW);//keep blinking light red
      delay(1000);
      }
      } else {
        Serial.println("Waiting for FONA GPS 3D fix...");
      }
      
      // Check for network, then GPRS 
      Serial.println(F("Checking for Cell network..."));
      if (fona.getNetworkStatus() == 1) {
        // network & GPRS? Great! Print out the GSM location to compare
        float latitude, longitude;
        boolean gsmloc_success = fona.getGSMLoc(&latitude, &longitude);
        if (gsmloc_success) {
          Serial.print("GSMLoc lat:");
          Serial.println(latitude, 6);
          Serial.print("GSMLoc long:");
          Serial.println(longitude, 6);          
           //send sms
           
      char message[141];  
      char LAT1[10];//string of lat and long unparsed & overflowing bound
      char LAT[10];
      char LONG[10];
      dtostrf(latitude, 10, 7, LAT1); //gathering GPS data in a format that can be sent
      dtostrf(longitude, 10, 7, LONG);
      
      //initialize desired array from unparsed array
      for(int i = 0; i < 9; i++) {
      LAT[i] = LAT1[i];
      }
      LAT[9] = '\0';//truncate array at last desired value
      sprintf(message, "I JUST PUSHED MY PANIC BUTTON! I NEED HELP NOW! https://www.google.com/maps?q=%s,%s", LAT, LONG);
      
      Serial.println(LAT);Serial.println(LAT1);Serial.println(LONG);
      Serial.println(message) ;    //prints the message in the serial monitor before sending

      char sendto[13] = "+19999999999"; //put the desired destination phone number for sms here

      fona.sendSMS(sendto, message) ; //sends the message via SMS}

      //BLINK BLUE LED FOR 30 SECONDS TO NOTIFY THAT TEXT SENT
      for (int i = 0; i < 30; i++){
      digitalWrite(BLUE_PIN, HIGH);//keep blinking light BLUE
      delay(1000);
      digitalWrite(BLUE_PIN, LOW);//keep blinking light BLUE
      delay(1000);
      }     
      } else {
        Serial.println("GSM location failed...");
        Serial.println(F("Disabling GPRS"));
        fona.enableGPRS(false);
        Serial.println(F("Enabling GPRS"));
        if (!fona.enableGPRS(true)) {
        Serial.println(F("Failed to turn GPRS on"));  
          }
        }
      }
   }
}

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* Panic Button!

* A way to silently alert authorities or someone who can help with your GPS location.

Created 20-11-2017

By Deon P.

The tutorial can be found at:

http://www.sensingthecity.com

#include "Adafruit_FONA.h"

#include <SoftwareSerial.h>

#define FONA_RX 2

#define FONA_TX 3

#define FONA_RST 4

#include <SoftwareSerial.h>

SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);

SoftwareSerial *fonaSerial = &fonaSS;

// Use this for FONA 800 and 808s

Adafruit_FONA fona = Adafruit_FONA(FONA_RST);

//for replies later

char replybuffer[255];

uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);

uint8_t type;

const int buttonPin = 8; // pushbutton pin

//RGB pins

const int RED_PIN = 9;

const int GREEN_PIN = 10;

const int BLUE_PIN = 11;

void setup() {

while (! Serial);

Serial.begin(115200);

Serial.println(F("Initializing FONA... (May take a few seconds)"));

fonaSerial->begin(4800);

if (! fona.begin(*fonaSerial)) {

Serial.println(F("Couldn't find FONA"));

while(1);

}

Serial.println(F("FONA is OK"));

// Try to enable GPRS

Serial.println(F("Enabling GPS..."));

fona.enableGPS(true);

delay(4000);

pinMode(RED_PIN, OUTPUT);

pinMode(GREEN_PIN, OUTPUT);

pinMode(BLUE_PIN, OUTPUT);

}

void loop() {

//BLINK RED LED TO SIGNIFY PRE-SMS-SEND (NORMAL) STATUS

digitalWrite(RED_PIN, HIGH);

delay(1000);

digitalWrite(RED_PIN, LOW);

delay(1000);

int buttonState;

buttonState = digitalRead(buttonPin);

//if holding down button (i.e. panic)

if (buttonState == LOW) {

//get gps location

float latitude, longitude;//variables to hold initial GPS readings

boolean gps_success = fona.getGPS(&latitude, &longitude);

if (gps_success) {

Serial.print("GPS lat:");

Serial.println(latitude, 6);

Serial.print("GPS long:");

Serial.println(longitude, 6);

//send sms

char message[141];

char LAT1[10];//string of lat and long unparsed & overflowing bound

char LAT[10];

char LONG[10];

dtostrf(latitude, 10, 7, LAT1); //gathering GPS data in a format that can be sent

dtostrf(longitude, 10, 7, LONG);

//initialize desired array from unparsed array

for(int i = 0; i < 9; i++) {

LAT[i] = LAT1[i];

}

LAT[9] = '\0';//truncate array at last desired value

sprintf(message, "I JUST PUSHED MY PANIC BUTTON! I NEED HELP NOW! https://www.google.com/maps?q=%s,%s", LAT, LONG);

Serial.println(LAT);Serial.println(LAT1);Serial.println(LONG);

Serial.println(message) ; //prints the message in the serial monitor before sending

char sendto[13] = "+19999999999"; //put the desired destination phone number for sms here

fona.sendSMS(sendto, message) ; //sends the message via SMS}

//BLINK BLUE LED FOR 30 SECONDS TO NOTIFY THAT TEXT SENT

for (int i = 0; i < 30; i++){

digitalWrite(BLUE_PIN, HIGH);//keep blinking light red

delay(1000);

digitalWrite(BLUE_PIN, LOW);//keep blinking light red

delay(1000);

}

} else {

Serial.println("Waiting for FONA GPS 3D fix...");

}

// Check for network, then GPRS

Serial.println(F("Checking for Cell network..."));

if (fona.getNetworkStatus() == 1) {

// network & GPRS? Great! Print out the GSM location to compare

float latitude, longitude;

boolean gsmloc_success = fona.getGSMLoc(&latitude, &longitude);

if (gsmloc_success) {

Serial.print("GSMLoc lat:");

Serial.println(latitude, 6);

Serial.print("GSMLoc long:");

Serial.println(longitude, 6);

//send sms

char message[141];

char LAT1[10];//string of lat and long unparsed & overflowing bound

char LAT[10];

char LONG[10];

dtostrf(latitude, 10, 7, LAT1); //gathering GPS data in a format that can be sent

dtostrf(longitude, 10, 7, LONG);

//initialize desired array from unparsed array

for(int i = 0; i < 9; i++) {

LAT[i] = LAT1[i];

}

LAT[9] = '\0';//truncate array at last desired value

sprintf(message, "I JUST PUSHED MY PANIC BUTTON! I NEED HELP NOW! https://www.google.com/maps?q=%s,%s", LAT, LONG);

Serial.println(LAT);Serial.println(LAT1);Serial.println(LONG);

Serial.println(message) ; //prints the message in the serial monitor before sending

char sendto[13] = "+19999999999"; //put the desired destination phone number for sms here

fona.sendSMS(sendto, message) ; //sends the message via SMS}

//BLINK BLUE LED FOR 30 SECONDS TO NOTIFY THAT TEXT SENT

for (int i = 0; i < 30; i++){

digitalWrite(BLUE_PIN, HIGH);//keep blinking light BLUE

delay(1000);

digitalWrite(BLUE_PIN, LOW);//keep blinking light BLUE

delay(1000);

}

} else {

Serial.println("GSM location failed...");

Serial.println(F("Disabling GPRS"));

fona.enableGPRS(false);

Serial.println(F("Enabling GPRS"));

if (!fona.enableGPRS(true)) {

Serial.println(F("Failed to turn GPRS on"));

}

PART 2 | DEMO

A) Once the RGB LED is blinking red, we’re ready to test. HOLD Down the Button (for about 2-3 seconds) then release it.

B) First, look at the serial monitor. Were you able to get a GPS fix? Hint: If you can see GPS coordinates, then you did!

If not, repeat step 1. (You may need to test near a window or in a place with great cellular reception, since the SMS will not send without getting a GPS fix).

C) IN THE SERIAL MONITOR, after you get a fix, you’ll see the number and message you designated in the code (not +11111111111 as you see in the image below). You’ll also notice that the RGB LED now blinks BLUE (for about 30 seconds).

D) THE SMS (you’ll get the message you created at whatever phone number you designated in the code).

E) THE LINK (it works!)

YOU’RE DONE!

Comments are welcome! Congrats, and thanks for panicking!

2 replies on “Push Button to Send SMS with GPS Location [i.e., Panic Button]”

Hello, I am a High School student that is working on a project involving the use of GPS locations and automatic texting services, but we have no use for the push button in your code. Is there a way to get rid of these push button commands, also what are the numbers next to latitude and longitude referring to because we have looked through the code and have no idea what they are referring to.

hello Iam Final year ECE student. why can’t i send bulk of SMS and repetion of SMS to those persons

PART I | Getting Started

1.1 ASSEMBLY

1.2 TEST HARDWARE

PART 2 | THE CODE

PART 2 | DEMO

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2 replies on “Push Button to Send SMS with GPS Location [i.e., Panic Button]”

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