Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates various sensors and modules with an ESP32 microcontroller. The circuit includes an MQ-3 alcohol sensor, an MPU6050 accelerometer and gyroscope, an IR sensor, a GPS module, a GSM module, and an LED. The ESP32 microcontroller is programmed to read data from these sensors, control the LED, and send data to a cloud server and via SMS.

Component List

1. ESP32 (30 pin)

   • Description: A powerful microcontroller with built-in WiFi and Bluetooth capabilities.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

2. MQ-3 Breakout

   • Description: An alcohol sensor used to detect the presence of alcohol in the air.
   • Pins: VCC, GND, DO, AO

3. LED: Two Pin (red)

   • Description: A simple red LED.
   • Pins: cathode, anode

4. MPU6050 Accelerometer + Gyroscope (Wokwi Compatible)

   • Description: A sensor module that provides accelerometer and gyroscope data.
   • Pins: INT, AD0, XCL, XDA, SDA, SCL, GND, VCC

5. IR Sensor

   • Description: An infrared sensor used to detect objects.
   • Pins: out, gnd, vcc

6. Sim A7670c

   • Description: A GSM module used for sending SMS.
   • Pins: Vin, Gnd, Tx, Rx

7. GPS NEO 6M

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

Wiring Details

ESP32 (30 pin)

• D13: Connected to the anode of the LED.
• GND: Connected to the cathode of the LED, GND of GPS NEO 6M, GND of MQ-3 Breakout, GND of IR sensor, GND of MPU6050, and GND of Sim A7670c.
• D23: Connected to DO of MQ-3 Breakout.
• D22: Connected to SCL of MPU6050.
• TX0: Connected to RX of GPS NEO 6M.
• RX0: Connected to TX of GPS NEO 6M.
• D21: Connected to AD0 of MPU6050.
• TX2: Connected to Rx of Sim A7670c.
• RX2: Connected to Tx of Sim A7670c.
• D4: Connected to out of IR sensor.
• D2: Connected to AO of MQ-3 Breakout.
• 3V3: Connected to VCC of MQ-3 Breakout, VCC of IR sensor, VCC of MPU6050, and VCC of GPS NEO 6M.

MQ-3 Breakout

• DO: Connected to D23 of ESP32.
• AO: Connected to D2 of ESP32.
• GND: Connected to GND of ESP32, GND of IR sensor, GND of MPU6050, and GND of Sim A7670c.
• VCC: Connected to 3V3 of ESP32.

LED: Two Pin (red)

• anode: Connected to D13 of ESP32.
• cathode: Connected to GND of ESP32 and GND of GPS NEO 6M.

MPU6050 Accelerometer + Gyroscope (Wokwi Compatible)

• SCL: Connected to D22 of ESP32.
• AD0: Connected to D21 of ESP32.
• GND: Connected to GND of ESP32, GND of MQ-3 Breakout, GND of IR sensor, and GND of Sim A7670c.
• VCC: Connected to 3V3 of ESP32.

IR Sensor

• out: Connected to D4 of ESP32.
• gnd: Connected to GND of ESP32, GND of MQ-3 Breakout, GND of MPU6050, and GND of Sim A7670c.
• vcc: Connected to 3V3 of ESP32.

Sim A7670c

• Rx: Connected to TX2 of ESP32.
• Tx: Connected to RX2 of ESP32.
• Gnd: Connected to GND of ESP32, GND of MQ-3 Breakout, GND of IR sensor, and GND of MPU6050.
• Vin: Not connected.

GPS NEO 6M

• RX: Connected to TX0 of ESP32.
• TX: Connected to RX0 of ESP32.
• GND: Connected to GND of ESP32 and GND of LED.
• VCC: Connected to 3V3 of ESP32.

Documented Code

ESP32 Code

#include <Wire.h>
#include <Adafruit_MPU6050.h>
#include <Adafruit_Sensor.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <SoftwareSerial.h>

// WiFi credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

// Cloud server details (optional if you want cloud integration)
const char* serverName = "https://your-cloud-server.com/api";

// GSM Module pins for A7670C
#define A7670C_RX 16  // ESP32 RX pin (for A7670C TX)
#define A7670C_TX 17  // ESP32 TX pin (for A7670C RX)

SoftwareSerial gsmSerial(A7670C_RX, A7670C_TX);  // Create a software serial for A7670C communication

// Sensors and pins
const int analogPin = 2;  // MQ-3 AO connected to ESP32 D2
const int digitalPin = 23; // MQ-3 DO connected to ESP32 D23
const int ledPin = 13; // Onboard LED
const int irPin = 4; // IR sensor output connected to ESP32 D4

Adafruit_MPU6050 mpu; // MPU6050 instance

// Phone number and message for SMS
const char *phoneNumber = "+1234567890"; // Replace with the recipient's phone number
String message = "";

void setup() {
  Serial.begin(115200);
  gsmSerial.begin(9600);  // Initialize GSM communication (A7670C baud rate)

  pinMode(digitalPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(irPin, INPUT);

  // Initialize MPU6050
  if (!mpu.begin()) {
    Serial.println("Failed to find MPU6050 chip");
    while (1) delay(10);
  }
  Serial.println("MPU6050 initialized!");

  // Configure MPU6050
  mpu.setAccelerometerRange(MPU6050_RANGE_2_G); // ±2g
  mpu.setGyroRange(MPU6050_RANGE_250_DEG);     // ±250°/s
  mpu.setFilterBandwidth(MPU6050_BAND_21_HZ);  // 21 Hz filter

  // Connect to WiFi
  connectToWiFi();
}

void loop() {
  // Read sensor values
  int analogValue = analogRead(analogPin);
  int digitalValue = digitalRead(digitalPin);
  int irValue = digitalRead(irPin);

  // Print sensor values to serial
  Serial.print("Analog Value: ");
  Serial.println(analogValue);
  Serial.print("IR Sensor Value: ");
  Serial.println(irValue);

  // LED control based on digital pin
  digitalWrite(ledPin, digitalValue);

  // Fetch GPS data
  String gpsData = fetchGPSData();

  // If GPS data is valid, send to cloud and SMS
  if (!gpsData.isEmpty()) {
    sendToCloud(gpsData, analogValue, irValue);
    message = "GPS: " + gpsData + " | Alcohol Level: " + String(analogValue) + " | IR Value: " + String(irValue);
    sendSMS(phoneNumber, message);  // Send SMS with sensor data
  }

  delay(1000); // Delay 1 second
}

void connectToWiFi() {
  Serial.print("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
}

String fetchGPSData() {
  // Simulated GPS data (replace with actual GPS fetch logic)
  String latitude = "17.385044"; // Replace with parsed