ESP32 GPS Tracker with GSM (SIM800L / A7672S)
An ESP32-based GPS tracking system that sends real-time location data using GSM modules like SIM800L or A7672S via SMS or cloud.
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₹4472.00
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Components
9 items
Difficulty
Advanced
Build Time
3 – 4 hours
Project Details
How It Works
How It WorksThe GPS module receives satellite signals and provides NMEA sentences via serial communication to the ESP32. The ESP32 uses the TinyGPS++ library to parse latitude and longitude data. The GSM module connects to the cellular network using AT commands. When location data is ready, the ESP32 sends it via SMS or HTTP to a specified phone number or cloud server. The user receives real-time tracking information with Google Maps links.
Prerequisites
Basic knowledge of Arduino programming, understanding of serial communication, familiarity with ESP32 GPIO pins, and experience with AT commands for GSM modules. Users should also understand power requirements for GSM modules.
What You'll Learn
What You'll LearnUnderstanding how GPS modules receive and decode satellite signals
Learning to control GSM modules using AT commands for SMS and data transmission
Implementing serial communication between ESP32 and peripheral modules
Building IoT systems that operate without Wi-Fi using cellular networks
Managing power requirements for power-hungry GSM modules
Key Features
Continuously reads and transmits GPS coordinates
Sends location data via SMS to specified phone numbers
Generates clickable Google Maps links from GPS coordinates
Operates entirely on cellular networks, ideal for mobile applications
What's Included in the Kit
| Component | Qty | Price |
|---|---|---|
 | 1 | ₹1682.00 |
 | 1 | ₹557.00 |
 | 1 | ₹245.00 |
External GSM Antenna | 1 | ₹0.00 |
| 1 | ₹0.00 |
 | 1 | ₹48.00 |
SIM Card (with SMS/Data) | 1 | ₹0.00 |
 | 1 | ₹0.00 |
 | 1 | ₹171.00 |
Operating Instructions
Pin Connections
Pin Connections| MCU Pin | Connected To | Purpose | Notes |
|---|---|---|---|
| GPIO 16 | GPS Module TX | Serial receive (RX) from GPS | GPS TX connects to ESP32 RX |
| GPIO 17 | GPS Module RX | Serial transmit (TX) to GPS | GPS RX connects to ESP32 TX |
| GPIO 26 | GSM Module TX | Serial receive (RX) from GSM | GSM TX connects to ESP32 RX |
| GPIO 27 | GSM Module RX | Serial transmit (TX) to GSM | GSM RX connects to ESP32 TX |
| 3.3V | GPS Module VCC | Power supply for GPS module | GPS typically runs on 3.3V |
| GND | GPS Module GND | Common ground for GPS module | - |
| External 4V Supply | GSM Module VCC | Power supply for GSM module | NEVER power from ESP32 - requires 3.7-4.2V @ 2A peak |
| GND | GSM Module GND | Common ground for GSM module | - |
Tools Required
Tools RequiredSafety Precautions
Electrical
- ⚠SIM800L requires 3.7–4.2V @ 2A peak — NEVER power from ESP32
- ⚠Use proper GSM power supply with adequate current capacity
- ⚠Ensure correct polarity when connecting power supplies
Handling
- ⚠Attach antennas before powering the modules
- ⚠Avoid touching GSM module while transmitting to prevent interference
Operating
- ⚠Avoid indoor GPS testing - GPS requires clear sky visibility
- ⚠Secure SIM PIN to prevent unauthorized use
- ⚠Limit SMS transmissions to avoid carrier restrictions
Frequently Asked Questions
Frequently Asked QuestionsQ:Does GPS work indoors?
Q:Can location be sent to cloud?
Q:Is A7672S better than SIM800L?
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