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plz help me to make me understand this code

F

fhtechiiuc

New Coder
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <Hash.h>
#include <ESPAsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <FS.h>
#include <String.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_MPU6050.h>
#include <Adafruit_SSD1306.h>
#include <SoftwareSerial.h>
SoftwareSerial sim808(D6,D7); //Rx, Tx

#define gsm sim808 // gsm as sim module
#define vibPin D5 // Vibration Sensor
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET 4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display = Adafruit_SSD1306(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);

/* Assign a unique ID to this sensor at the same time */
Adafruit_MPU6050 mpu;
/* Variables for holding axis data*/
float x_axis, y_axis, z_axis; //0, 0 ,~9.8 ms^-2
int pos;
String collision = "No";
long t_time = millis();
long c_time = millis();
String posi;
String data[5];
#define DEBUG true
String state,timegps,latitude,longitude;
String sms, cellno = "+8801869441097"; // USE INTERNATIONAL FORMAT CODE FOR MOBILE NUMBERS
int sms_token = 0;
// Replace with your network credentials
const char* ssid = "fahimajmal";
const char* password = "fahim360@";

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

void read_adxl(float* x_axis, float* y_axis, float* z_axis, int* pos){
/* Get a new sensor event */
sensors_event_t event, g, temp;
mpu.getEvent(&event, &g, &temp);
*x_axis = event.acceleration.x;
*y_axis = event.acceleration.y;
*z_axis = event.acceleration.z;
/* Display the results (acceleration is measured in m/s^2) */
Serial.print("X: "); Serial.print(*x_axis); Serial.print(" ");
Serial.print("Y: "); Serial.print(*y_axis); Serial.print(" ");
Serial.print("Z: "); Serial.print(*z_axis); Serial.print(" ");Serial.println("m/s^2 ");
if(*x_axis > 7.0){
*pos = 1;
}
else if (*x_axis < -7.0){
*pos = 2;
}
else if (*y_axis > 7.0){
*pos = 3;
}
else if (*y_axis < -7.0){
*pos = 4;
}
else if (*z_axis < -7.0){
*pos = 5;
}
else{
*pos = 0;
}
delay(500);
}

void get_location(){
sendTabData("AT+CGNSINF",1000,DEBUG);
if (state !=0) {
Serial.println("State :"+state);
Serial.println("Time :"+timegps);
Serial.println("Latitude :"+latitude);
Serial.println("Longitude :"+longitude);
sim808.flush();
} else {
Serial.println("GPS Initialising...");
}
}

void accident_alert(){
// //wait for the pin to get HIGH and returns measurement
long measurement=pulseIn (vibPin, HIGH);
Serial.println(measurement); // Print the measurement.
if(collision.equals("Heavy") || collision.equals("Medium")){
digitalWrite(D3, HIGH);
if((c_time+60000) < millis()){
collision = "No";
}
if(sms_token){
sendMessage(collision, posi);
sms_token = 0;
}
}
else{
digitalWrite(D3, LOW);
if (measurement > 90000){
collision = "Heavy";
c_time = millis();
sms_token = 1;
}
else if (measurement > 10000){
collision = "Medium";
c_time = millis();
sms_token = 1;
}
else if (measurement > 30){
collision = "Mild";
}
else{
collision = "No";
}
}

}

void setup() {
pinMode(D5, INPUT);
pinMode(D3, OUTPUT);
digitalWrite(D3, LOW);
sim808.begin(9600);
Serial.begin(115200);
/* Initialise the sensor */
if (!mpu.begin()) {
Serial.println("Sensor init failed");
while (1)
yield();
}
Serial.println("Found a MPU-6050 sensor");

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32
Serial.println(F("SSD1306 allocation failed"));
for(;😉; // Don't proceed, loop forever
}
display.display();
delay(500); // Pause for 2 seconds
display.setTextSize(1);
display.setTextColor(WHITE);
display.setRotation(0);
display.clearDisplay();
display.setCursor(1, 0);
display.println(F("Starting File System..."));
display.display();
delay(100);
// Initialize SPIFFS
if(!SPIFFS.begin()){
Serial.println("An Error has occurred while mounting SPIFFS");
display.println(F("Error Loading File System..."));
return;
}
// Clear the buffer
display.clearDisplay();
display.setTextSize(1); // Draw 2X-scale text
display.setTextColor(WHITE);
display.setCursor(1, 0);
display.println(F("Connecting to WiFi.."));
display.display();
delay(100);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}

// Print ESP8266 Local IP Address
// Clear the buffer
display.clearDisplay();
display.setTextSize(1); // Draw 2X-scale text
display.setTextColor(WHITE);
display.setCursor(1, 0);
display.print(F("IP:"));
display.println(WiFi.localIP());
display.display(); // Show initial text
delay(100);
Serial.println(WiFi.localIP());

delay(50);

/*Initiate the GSM Module*/
sendData("AT",1000,DEBUG);
delay(50);
sendData("AT+CSQ",1000,DEBUG); //Signal Quality Report
delay(150);
sendData("AT+CREG?",1000,DEBUG); //Attach or Detach from Gprs Service
delay(150);
/*Initiate the GPS Module*/
sendData("AT+CGNSPWR=1",1000,DEBUG);
delay(50);
sendData("AT+CGNSSEQ=RMC",1000,DEBUG);
delay(150);

// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send(SPIFFS, "/index.html");
});
server.on("/position", HTTP_GET, [](AsyncWebServerRequest *request){
//read_adxl(&x_axis, &y_axis, &z_axis);
request->send_P(200, "text/plain", (String(x_axis)+","+String(y_axis)+","+String(z_axis)).c_str());
});
server.on("/location", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", (latitude+","+longitude).c_str());
});
server.on("/alert", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", (collision+","+posi).c_str());
});

// Start server
server.begin();
}

void loop() {
read_adxl(&x_axis, &y_axis, &z_axis, &pos);
accident_alert();
if(pos>0){
if (pos == 1){
posi = "Flipped Left";
}
else if (pos == 2){
posi = "Flipped Right";
}
else if (pos == 3){
posi = "Flipped Backward";
}
else {
posi = "Flipped Forward";
}
}
else{
posi = "Normal";
}
if((t_time+4000) < millis()){
get_location();
t_time = millis();
}
display.clearDisplay();
display.setCursor(1, 0);
display.print(F("IP:"));
display.println(WiFi.localIP());
display.print("X:");
display.print(x_axis, 1);
display.print(",Y:");
display.print(y_axis, 1);
display.print(",Z:");
display.print(z_axis, 1);
display.println("");
display.println("Postion: "+ posi);
display.println(collision + " Collision Detected");
display.display();
delay(100);
}

void sendTabData(String command , const int timeout , boolean debug){

sim808.println(command);
long int time = millis();
int i = 0;

while((time+timeout) > millis()){
while(sim808.available()){
char c = sim808.read();
if (c != ',') {
data +=c;
delay(100);
} else {
i++;
}
if (i == 5) {
delay(100);
goto exitL;
}
}
}exitL:
if (debug) {
state = data[1];
timegps = data[2];
latitude = data[3];
longitude = data[4];
}
}

String sendData (String command , const int timeout ,boolean debug){
String response = "";
sim808.println(command);
long int time = millis();
int i = 0;

while ( (time+timeout ) > millis()){
while (sim808.available()){
char c = sim808.read();
response +=c;
}
}
if (debug) {
Serial.print(response);
}
return response;
}

void sendMessage(String coll, String posi){
display.clearDisplay();
display.setCursor(1, 0);
display.println("Sending SOS Alert...");
gsm.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
ShowSerialData();
gsm.print("AT+CMGS=\"");
gsm.print(cellno);
gsm.println("\"\r");
ShowSerialData();

sms = coll + " Collision Detect!!!";
sms += "Position of vehicle is "+ posi;
sms += ". Vehicle can be found at:";

if(latitude.toDouble()!= 0.0 || longitude.toDouble()!= 0.0 ){
sms += "https://maps.google.com/maps?q="+latitude+","+longitude;
}else{
sms += "https://maps.google.com/maps?q=22.355318,91.838569";
}

gsm.println(sms);// The SMS text you want to send
delay(100);
gsm.println((char)26);// ASCII code of CTRL+Z
ShowSerialData();
gsm.println("AT+CMGF=0"); //Sets the GSM Module in PDU Mode
ShowSerialData();
display.println("SMS sent");
display.display();
Serial.println("SMS sent");
delay(5000);
}

void ShowSerialData() //Show serial data
{ delay(1000);
while(sim808.available()!=0)
Serial.write(sim808.read());
Serial.println();
}
 

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