Circuit Documentation

Summary

This circuit is designed to integrate an Arduino Nano with a GPS module, a GSM module, pushbuttons, a piezo buzzer, resistors, a toggle switch, a 9V battery, and a battery charging protection module. The primary function of the circuit is to send an SMS with GPS coordinates or make a call when a button is pressed.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. Piezo Buzzer

   • Description: A small audio signaling device.
   • Pins: pin 1, pin 2

3. Pushbutton

   • Description: A simple pushbutton switch.
   • Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)

4. Neo 6M GPS Module

   • Description: A GPS module for obtaining location data.
   • Pins: GND, TX, RX, VCC

5. Resistor (10k Ohms)

   • Description: A resistor with a resistance of 10k Ohms.
   • Pins: pin1, pin2

6. sim 800l

   • Description: A GSM module for sending SMS and making calls.
   • Pins: NFT, RING, VCC, DTR, RST, MIC +, RXD, MIC-, TXD, SPK+, GND, SPK-

7. 9V Battery

   • Description: A 9V battery for powering the circuit.
   • Pins: -, +

8. TP4056 Battery Charging Protection Module (Type C)

   • Description: A module for charging and protecting the battery.
   • Pins: OUT +, B+, B-, OUT -, +, -

9. Toggle Switch

   • Description: A switch for toggling the power.
   • Pins: L1, COM, L2

Wiring Details

Arduino Nano

• D0/RX connected to TX of Neo 6M GPS Module
• GND connected to:
  • pin1 of Resistor
  • GND of sim 800l
  • - of 9V Battery
  • B- of TP4056 Battery Charging Protection Module
  • GND of Neo 6M GPS Module
  • pin1 of another Resistor
• D7 connected to TXD of sim 800l
• D8 connected to RXD of sim 800l
• 5V connected to:
  • Pin 1 (in) of Pushbutton
  • Pin 1 (in) of another Pushbutton
  • VCC of sim 800l
  • VCC of Neo 6M GPS Module
  • L2 of Toggle Switch

Piezo Buzzer

• pin 1 connected to MIC + of sim 800l
• pin 2 connected to MIC- of sim 800l

Pushbutton

• Pin 4 (out) of one Pushbutton connected to pin2 of Resistor
• Pin 4 (out) of another Pushbutton connected to pin2 of another Resistor

Neo 6M GPS Module

• TX connected to D0/RX of Arduino Nano
• GND connected to GND of Arduino Nano
• VCC connected to 5V of Arduino Nano

Resistor (10k Ohms)

• pin1 connected to GND of Arduino Nano
• pin2 connected to Pin 4 (out) of Pushbutton

sim 800l

• TXD connected to D7 of Arduino Nano
• RXD connected to D8 of Arduino Nano
• VCC connected to 5V of Arduino Nano
• GND connected to GND of Arduino Nano
• MIC + connected to pin 1 of Piezo Buzzer
• MIC- connected to pin 2 of Piezo Buzzer

9V Battery

• - connected to GND of Arduino Nano
• + connected to B+ of TP4056 Battery Charging Protection Module

TP4056 Battery Charging Protection Module (Type C)

• B- connected to GND of Arduino Nano
• B+ connected to + of 9V Battery

Toggle Switch

• COM connected to + of 9V Battery
• L2 connected to 5V of Arduino Nano

Documented Code

//Prateek
//www.justdoelectronics.com

#include <TinyGPS.h>
#include <SoftwareSerial.h>
#include <Wire.h>
SoftwareSerial Gsm(7, 8);
char phone_no[] = "+9188305848xx";  //For SMS
TinyGPS gps;
int state;
String textMessage;

void setup() {
  Serial.begin(9600);
  Gsm.begin(9600);
  delay(2000);

  Serial.print("AT+CMGF=1\r");
  delay(100);
  Serial.print("AT+CNMI=2,2,0,0,0\r");
  delay(100);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
}

void loop() {

  bool newData = false;
  unsigned long chars;
  unsigned short sentences, failed;

  for (unsigned long start = millis(); millis() - start < 1000;) {
    while (Serial.available()) {
      char c = Serial.read();
      Serial.print(c);
      if (gps.encode(c))
        newData = true;
    }
  }
  if (Gsm.available() > 0) {
    textMessage = Gsm.readString();
    textMessage.toUpperCase();
    delay(10);
  }

  state = digitalRead(4);
  if (state == 1)  //When Button is Press
  {
    float flat, flon;
    unsigned long age;
    gps.f_get_position(&flat, &flon, &age);
    Gsm.print("AT+CMGF=1\r");
    delay(400);
    Gsm.print("AT+CMGS=\"");
    Gsm.print(phone_no);
    Gsm.println("\"");
    Gsm.println("Alert I need help.............");
    Gsm.print("http://maps.google.com/maps?q=loc:");
    Gsm.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
    Gsm.print(",");
    Gsm.print(flon == TinyGPS ::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
    delay(200);
    Gsm.println((char)26);
    delay(200);
    Gsm.println();
    delay(10000);
  } else {
    delay(10);
  }

  state = digitalRead(5);
  if (state == 1)  //When Button is Press
  {

    Serial.println("OK");
    delay(20000);
    Gsm.println("ATD+9188305848xx;");  //For Call
    delay(150000);
    Gsm.println("ATH");
    delay(1000);

  } else {
    delay(10);
  }
  Serial.println(failed);
}

This code initializes the GPS and GSM modules, reads GPS data, and sends an SMS with the GPS coordinates or makes a call when a button is pressed.