LILYGO T-SIM7670G S3

Overview

The T-SIM7670G S3 is a comprehensive connectivity development board from LILYGO that combines ESP32 with the SIM7670G 4G LTE cellular modem incorporating an integrated GPS receiver. This combination provides a single-board solution for applications requiring both cellular data connectivity and geolocation tracking.

The SIM7670G supports data-only SIM cards and provides Cat-1 LTE connectivity, suitable for IoT telemetry, asset tracking, remote monitoring, and connected devices in areas without WiFi coverage. The integrated GPS receiver works alongside the cellular modem without requiring additional hardware.

Notable design features include an abundance of free GPIO pins compared to similar boards, and support for deep sleep mode to extend battery life in remote deployments. The LilyGO-T-A76XX GitHub repository provides AT command examples, Arduino sketches for HTTP/HTTPS/MQTT over LTE, and GPS parsing code.

Firmware Compatibility

The T-SIM7670G S3 uses Arduino and ESP-IDF for the ESP32 host processor. The SIM7670G modem is controlled via AT commands over UART. The LilyGO-T-A76XX repository contains comprehensive AT command examples and Arduino library integrations.

Flashing Guide

1. Install Arduino IDE with ESP32 board support
2. Clone the LilyGO-T-A76XX repository for modem examples
3. Connect via USB Type-C
4. Select the appropriate ESP32 board type and COM port
5. Insert a data-only SIM card before powering on
6. Upload firmware and use the AT command library to initialize LTE and GPS