A7672S 4G LTE GNSS Module With Arduino – Complete Interfacing Guide

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A7672S 4G LTE GNSS Module With Arduino – Complete Interfacing Guide

A7672S-Module-Working-Setup.png

You want your Arduino to send GPS coordinates or SMS from anywhere without Wi-Fi? The A7672S 4G LTE GNSS module can do just that. It is a small board that adds cellular internet, GPS tracking, SMS, and even voice call capabilities to any Arduino project with a SIM card, just like your phone.

Whether you're working on asset tracking, remote data logging, or smart vehicle monitoring, A7672S offers:

  1. Mobile internet anywhere via 4G LTE
  2. Built-in GPS (GNSS: GPS, BeiDou, GLONASS, Galileo)
  3. SMS and call support
  4. Simple serial control from Arduino

No Wi-Fi? No problem. This module is ideal for real-world deployments where wired or wireless networks aren't available.

Real-World Applications

  1. Asset and vehicle tracking
  2. Remote monitoring stations
  3. Emergency alert systems
  4. IoT deployments in rural areas

The A7672S combines 4G, GNSS, and SMS in one single board, making it a great fit for DIY IoT projects that need reliable, remote communication. Once set up, it runs just like a phone, but entirely under your Arduino's control.

Supplies

  1. A7672S-FASE module (with GNSS)
  2. Arduino UNO or compatible board
  3. Micro SIM card (Airtel, Jio, or VI)
  4. 4G LTE antenna + GNSS antenna
  5. 5V–12V power supply (3A recommended)
  6. Optional: USB-to-Serial adapter for direct testing

Hardware Connections

Circuit-Diagram-of-A7672S-4G-LTE-with-Arduino_0.png

This is how you connect the module:

  1. TX (A7672S) → RX (Arduino)
  2. RX (A7672S) → TX (Arduino)
  3. VCC → 5V on Arduino
  4. GND → GND

Optionally:

  1. Connect RST to a digital pin or GND to reset the module.
  2. Insert your Micro SIM card and connect the two antennas.

Ensure your power supply can accommodate peak 3A current draw.

Arduino Sketch

You will require a simple Arduino sketch to send AT commands via Serial. Here is a simple passthrough sketch:

// Serial passthrough sketch for communicating with A7672S
void setup() {
Serial.begin(9600); // Monitor
Serial1.begin(115200); // A7672S default baud
}

void loop() {
while (Serial.available()) {
Serial1.write(Serial.read());
}
while (Serial1.available()) {
Serial.write(Serial1.read());
}
}


Upload this to your Arduino, open Serial Monitor at 9600 baud, and start sending AT commands.

Downloads

A7672S_SerialCommunication_Interface_Arduino.ino

Send AT Commands

Here are a few to try out:


  1. AT → Should respond OK
  2. AT+CPIN? → SIM status
  3. AT+CSQ → Signal strength
  4. AT+CGNSSPWR=1 → Turn on GPS
  5. AT+CMGF=1 → SMS text mode
  6. AT+CMGS="+91xxxxxxxxxx" → SMS


These commands allow you to access GPS, SMS, internet, etc., all from the Serial Monitor itself.

GPS and Tracking

Once GNSS is enabled (AT+CGNSSPWR=1), fetch location using:

AT+CGNSSINFO

You’ll get latitude, longitude, speed, and time info. This can be parsed and either:

  1. Displayed in Serial Monitor
  2. Sent via SMS
  3. Also Posted to a web server (via AT+HTTP commands)


For the comprehensive guide on the A7672S module, visit: A7672S 4G LTE GNSS Module with Arduino


If you're exploring how far you can push Arduino boards, here's a tech commentary style deep dive into the daring ESP32-CAM and Arduino UNO combo: Program ESP32-CAM With Arduino UNO? Let's Push Our Luck