E&TC / ECE · Healthcare electronics · Final year project
Arduino Based Alcohol Sense Engine Lock & GPS
A drunk-driving prevention system with location alerts. An Arduino reads an MQ-3 alcohol sensor near the driver; if alcohol is detected it stops the vehicle motor and sends an SMS with the GPS location to a family member through a GSM module.
What is the Arduino Based Alcohol Sense Engine Lock & GPS project?
A drunk-driving prevention system with location alerts. An Arduino reads an MQ-3 alcohol sensor near the driver; if alcohol is detected it stops the vehicle motor and sends an SMS with the GPS location to a family member through a GSM module.
Key facts
- Type
- Final year project · Advanced
- Suitable for
- Diploma capstone and B.E / B.Tech final year
- Build time
- 6 to 8 weeks
- Estimated component cost
- ₹3,300 – ₹4,800
- Guidance from
- ₹9,999 (Hardware / IoT Final Year)
How the Arduino Based Alcohol Sense Engine Lock & GPS works
- 12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V.
- The Alcohol sensor detects alcohol in the driver's breath.
- The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs.
- The GSM module sends SMS alerts or makes calls to the registered phone number using a normal SIM card.
- The GPS module receives satellite signals and gives the latitude and longitude of the device.
- The 16×2 LCD with I2C adapter shows readings, status and messages to the user.
- The LEDs indicate status.
Block diagram
Inputs
Alcohol sensorController
Arduino Uno R3Communication
GSM moduleGPS moduleOutputs
16×2 LCD with I2C adapterLEDsComponents list and cost
Typical prices from Indian online stores and electronics markets (Lamington Road, Budhwar Peth, SP Road). Buy from one store where you can to save on shipping.
| Component | Qty | What it does | Approx. cost |
|---|---|---|---|
| Arduino Uno R3 | 1 | Reads the inputs, runs the decision logic written in C/C++ and drives the outputs. | ₹550 |
| Alcohol sensor (MQ-3) | 1 | Detects alcohol in the driver's breath. | ₹140 |
| GSM module (SIM800L) | 1 | Sends SMS alerts or makes calls to the registered phone number using a normal SIM card. | ₹450 |
| GPS module (NEO-6M) | 1 | Receives satellite signals and gives the latitude and longitude of the device. | ₹650 |
| 16×2 LCD with I2C adapter | 1 | Shows readings, status and messages to the user. | ₹220 |
| LEDs (assorted) | 1 | Indicate status. | ₹20 |
| 12 V power adapter / step-down transformer | 1 | Supplies stable low-voltage power from the mains. | ₹250 |
| Passive components, PCB and wiring kit | 1 | Resistors (assorted), capacitors (assorted), PCB / breadboard and cables, connectors and jumper wires. | ₹310 |
| Wiring, PCB, soldering and enclosure | 1 | Project overhead | ₹450 |
| Demo model base / mounting board | 1 | Project overhead | ₹500 |
| Testing spares and replacements | 1 | Project overhead | ₹300 |
| Estimated total | Varies with brand, quality and city | ₹3,300 – ₹4,800 |
Prices are estimates for budgeting. We confirm the bill of materials when your design is frozen, and components are charged at actual cost with bills.
How much does this project cost?
| Option | What you get | Cost |
|---|---|---|
| Components only | You buy the parts and build it yourself | ₹3,300 – ₹4,800 |
| Hardware / IoT Final Year | Working model or guided build, Circuit diagram and bill of materials, Firmware / code with explanation | from ₹9,999 + components |
| Capstone Project (CPE) | Working project or model, Black book in MSBTE format, Step-by-step explanation | ₹9,999 + components |
| Diploma ITR | 100% working source code, Project report PDF, PPT | ₹1,999 + components |
No GST and no hidden charges. Use the cost calculator for a quote with your deadline and add-ons, or see all plans.
Download the project brief (PDF)
Summary, working, components and cost and viva questions on one branded PDF to show your guide or team. To get it developed, contact us on WhatsApp.
What you submit with this project
- Working model with circuit diagram and program code
- Project report or black book in your university's chapter order (block diagram, circuit, calculations, results)
- Presentation for the review and final viva
- Synopsis for topic approval, if your college asks for one
E&TC / ECE viva questions on this project
What is the aim of the Arduino Based Alcohol Sense Engine Lock & GPS project?
A drunk-driving prevention system with location alerts. An Arduino reads an MQ-3 alcohol sensor near the driver; if alcohol is detected it stops the vehicle motor and sends an SMS with the GPS location to a family member through a GSM module.
Explain the working of your project in short.
12 V power adapter / step-down transformer supplies the circuit; a regulator gives the controller and sensors a steady 5 V. The Alcohol sensor detects alcohol in the driver's breath. The Arduino Uno R3 reads the inputs, runs the decision logic written in C/C++ and drives the outputs. The GSM module sends SMS alerts or makes calls to the registered phone number using a normal SIM card.
What microcontroller is on the Arduino Uno and what are its key specifications?
The Uno uses the ATmega328P: 8-bit, 16 MHz clock, 32 KB flash, 2 KB SRAM, 14 digital I/O pins (6 PWM) and 6 analog inputs with a 10-bit ADC.
How does the MQ-3 detect alcohol?
Its SnO2 sensing layer becomes more conductive in the presence of ethanol vapour. The analog output rises with concentration and the code compares it with a threshold.
How does the GSM module send an SMS?
The microcontroller sends AT commands over serial, for example AT+CMGF=1 to select text mode and AT+CMGS with the phone number followed by the message. The module transmits it over the mobile network.
How does a GPS module find its location?
It receives timing signals from at least four satellites, calculates the distance to each from the signal delay and solves for its position. The module outputs NMEA sentences like $GPGGA with latitude, longitude and time.
Why is an I2C adapter used with the LCD?
It reduces the wiring from about 10 pins to 2 (SDA and SCL), leaving more controller pins free for sensors.
Explain the block diagram of your project.
The input section senses the real-world quantity, the Arduino Uno R3 processes it according to the program, and the output section acts locally and sends the data or alert wirelessly. The power supply section feeds every block.
Which communication protocols are used between the modules?
UART (serial) for the GSM, GPS, Bluetooth or fingerprint modules, I2C for the display, RTC or motion sensor (only SDA and SCL lines) and analog inputs read by the ADC for the analog sensors. Each protocol was chosen because the module supports it and it uses the fewest pins.
What is the operating voltage of the circuit?
The controller and most sensors work at 5 V (ESP boards and some modules at 3.3 V). A 12 V adapter powers the board, and a regulator steps it down. Motors and relays get their own supply line so they do not reset the controller.
Related projects
Academic use: Project Buddyy offers mentoring, guidance and reference material for learning. You stay responsible for following your institution's academic integrity rules and for understanding everything you submit.
Want to build Arduino Based Alcohol Sense Engine Lock & GPS?
Send your college, deadline and team size. We confirm the scope, cost and what you will submit.