Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to detect alcohol levels, alert the driver, and send the GPS location via SMS. The circuit utilizes an Arduino UNO microcontroller, various sensors, a GSM module, a GPS module, a motor driver, and other components to achieve its functionality.

Component List

1. Arduino UNO

   • Description: Microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. MQ-3 Breakout

   • Description: Alcohol sensor module.
   • Pins: VCC, GND, DO, AO

3. MPU-6050

   • Description: 6-axis motion tracking device.
   • Pins: VCC, GND, SCL, SDA, XDA, XCL, AD0, INT

4. Sim800l

   • Description: GSM/GPRS module.
   • Pins: NET, RST, VCC, RXD, TXD, GND

5. Polymer Lithium Ion Battery - 850mAh

   • Description: Rechargeable battery.
   • Pins: GND, VCC

6. Resistor (10 Ohms)

   • Description: Resistor with 10 Ohms resistance.
   • Pins: pin1, pin2

7. Resistor (20 Ohms)

   • Description: Resistor with 20 Ohms resistance.
   • Pins: pin1, pin2

8. GPS NEO 6M

   • Description: GPS module.
   • Pins: VCC, RX, TX, GND

9. L298N DC motor driver

   • Description: Dual H-Bridge motor driver.
   • Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB

10. 12v Battery

    • Description: 12V power source.
    • Pins: -, +

11. DC Motor

    • Description: DC motor.
    • Pins: pin 1, pin 2

12. Buzzer

    • Description: Sound alert device.
    • Pins: PIN, GND

13. LED: Two Pin (yellow)

    • Description: Yellow LED.
    • Pins: cathode, anode

14. Resistor (200 Ohms)

    • Description: Resistor with 200 Ohms resistance.
    • Pins: pin1, pin2

15. Electrolytic Capacitor

    • Description: Capacitor with 0.000001 Farads capacitance.
    • Pins: -, +

Wiring Details

Arduino UNO

• 5V connected to VCC of MPU-6050, GPS NEO 6M, and MQ-3 Breakout.
• GND connected to GND of MPU-6050, GPS NEO 6M, MQ-3 Breakout, 12v Battery, L298N DC motor driver, Polymer Lithium Ion Battery, Electrolytic Capacitor, Buzzer, and Sim800l.
• A0 connected to AO of MQ-3 Breakout.
• A4 connected to SDA of MPU-6050.
• A5 connected to SCL of MPU-6050.
• D12 connected to ENA of L298N DC motor driver.
• D11 connected to IN2 of L298N DC motor driver.
• D10 connected to IN1 of L298N DC motor driver.
• D9 connected to anode of LED: Two Pin (yellow).
• D8 connected to PIN of Buzzer.
• D7 connected to TXD of Sim800l.
• D4 connected to TX of GPS NEO 6M.
• D3 connected to RX of GPS NEO 6M.

MQ-3 Breakout

• VCC connected to 5V of Arduino UNO.
• GND connected to GND of Arduino UNO.
• AO connected to A0 of Arduino UNO.

MPU-6050

• VCC connected to 5V of Arduino UNO.
• GND connected to GND of Arduino UNO.
• SDA connected to A4 of Arduino UNO.
• SCL connected to A5 of Arduino UNO.

Sim800l

• GND connected to GND of Arduino UNO.
• TXD connected to D7 of Arduino UNO.
• VCC connected to VCC of Polymer Lithium Ion Battery.
• RXD connected to pin2 of Resistor (10 Ohms).

Polymer Lithium Ion Battery

• GND connected to GND of Arduino UNO.
• VCC connected to - of Electrolytic Capacitor and VCC of Sim800l.

Resistor (10 Ohms)

• pin1 connected to PIN of Buzzer and D8 of Arduino UNO.
• pin2 connected to RXD of Sim800l.

Resistor (20 Ohms)

• pin1 connected to PIN of Buzzer and D8 of Arduino UNO.
• pin2 connected to GND of Polymer Lithium Ion Battery.

GPS NEO 6M

• VCC connected to 5V of Arduino UNO.
• GND connected to GND of Arduino UNO.
• TX connected to D4 of Arduino UNO.
• RX connected to D3 of Arduino UNO.

L298N DC motor driver

• GND connected to GND of Arduino UNO.
• ENA connected to D12 of Arduino UNO.
• IN2 connected to D11 of Arduino UNO.
• IN1 connected to D10 of Arduino UNO.
• OUT1 connected to pin 2 of DC Motor.
• OUT2 connected to pin 1 of DC Motor.
• 5V connected to + of 12v Battery.

12v Battery

• - connected to GND of Arduino UNO.
• + connected to 5V of L298N DC motor driver.

DC Motor

• pin 1 connected to OUT2 of L298N DC motor driver.
• pin 2 connected to OUT1 of L298N DC motor driver.

Buzzer

• PIN connected to pin1 of Resistor (10 Ohms).
• GND connected to GND of Arduino UNO.

LED: Two Pin (yellow)

• anode connected to D9 of Arduino UNO.
• cathode connected to pin2 of Resistor (200 Ohms).

Resistor (200 Ohms)

• pin1 connected to cathode of LED: Two Pin (yellow).
• pin2 connected to GND of Arduino UNO.

Electrolytic Capacitor

• - connected to VCC of Polymer Lithium Ion Battery.
• + connected to GND of Polymer Lithium Ion Battery.

Documented Code

#include <SoftwareSerial.h> // Include for GSM communication
#include <Wire.h>           // Include for I2C communication (if needed)

// Define hardware pins
#define ALCOHOL_PIN      A0  // Analog pin for alcohol sensor
#define BUZZER_PIN       8   // Digital pin for buzzer
#define LED_PIN          9   // Digital pin for LED
#define MOTOR_IN1_PIN    10  // Digital pin for motor driver IN1
#define MOTOR_IN2_PIN    11  // Digital pin for motor driver IN2
#define MOTOR_ENA_PIN    12  // Digital pin for motor driver ENA

// SoftwareSerial for GSM module
SoftwareSerial gsmSerial(7, 6); // RX, TX for GSM module

// Function prototypes
void stopMotor();
void alertDriver();
void sendLocation();
void sendSMS(const char* text);
bool getGPSLocation(double* latitude, double* longitude);

// Setup function
void setup() {
    Serial.begin(9600);         // Initialize serial communication for debugging
    gsmSerial.begin(9600);      // Initialize GSM communication
    
    // Configure pin modes
    pinMode(ALCOHOL_PIN, INPUT);
    pinMode(BUZZER_PIN, OUTPUT