# LILYGO T-SIM A7670E

> ESP32-WROVER-E development board with A7670E LTE Cat-1 modem supporting voice calls, SMS, and GPS positioning. Available with multiple regional frequency variants for global 4G deployments.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** ESP32
- **Price:** ~$29.98
- **Product Readiness:** developer
- **CPU:** ESP32-WROVER-E
- **CPU Architecture:** Xtensa LX6 dual-core
- **RAM:** 520 KB
- **PSRAM:** 8MB
- **Flash:** 4MB
- **USB:** USB-C (CH9102)
- **Power:** 5V
- **Operating Voltage:** 3.3V
- **Battery:** 18650 Li-Ion (external holder)
- **Charging Port:** USB-C
- **Antenna:** U.FL/IPEX
- **SD Card:** microSD

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 4.2
- **Cellular:** 4G LTE Cat-1

## Open Source

- **Status:** open-firmware
- **Firmware:** Yes
- **Schematics:** No
- **PCB Layout:** No

## Compatible Firmware

arduino, esp-idf

## Use Cases

- iot-sensors
- asset-tracking
- remote-monitoring
- smart-agriculture
- vehicle-tracking
- alarm-systems

## Components

- **ESP32-WROVER-E** (mcu): Dual-core 240 MHz Xtensa LX6 MCU with 4 MB flash and 8 MB PSRAM, integrated Wi-Fi 802.11 b/g/n and Bluetooth 4.2. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-sim-a7670e&source=md-export)
- **A7670E** (cellular-modem): SIMCOM A7670E LTE Cat-1 modem supporting voice calls, SMS, and data over LTE-FDD B1/B3/B5/B7/B8/B20 and GSM 900/1800 MHz. Optional GNSS (GPS/GLONASS/BeiDou) positioning. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.ai-thinker.com%2Fpro_view-58.html&ref=openhardware.directory&product=lilygo-t-sim-a7670e&source=md-export)
- **CH9102** (usb-bridge): WCH CH9102 USB-to-TTL serial converter for USB programming and debugging. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.wch-ic.com%2Fproducts%2FCH9102.html&ref=openhardware.directory&product=lilygo-t-sim-a7670e&source=md-export)

## Protocols

- **I2C**
- **SPI**
- **UART**
- **SDIO**
- **I2S**
- **CAN**

## Available Software

- **[Arduino IDE]()** (open-source)
- **[ESP-IDF]()** (open-source)

## Description

## Overview

The LILYGO T-SIM A7670E is a compact cellular development board featuring the ESP32-WROVER-E module (4 MB flash, 8 MB PSRAM) paired with the SIMCOM A7670E LTE Cat-1 modem. It supports voice calls, SMS, and data connectivity across European LTE-FDD bands (B1/B3/B5/B7/B8/B20) and GSM 900/1800 MHz bands. Optional GPS variants add GNSS positioning via an integrated IPEX antenna connector. The board uses a CH9102 USB-to-serial bridge for programming, supports MicroSD storage, and includes a Nano SIM card slot and 18650 battery holder for portable operation.

## Where to Buy

- [LILYGO Official Store](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-sim-a7670e&ref=openhardware.directory&product=lilygo-t-sim-a7670e&source=md-export) — $29.98

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-sim-a7670e&ref=openhardware.directory&product=lilygo-t-sim-a7670e&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FLilyGo-Modem-Series&ref=openhardware.directory&product=lilygo-t-sim-a7670e&source=md-export)

## Tags

`esp32`, `4g`, `lte`, `a7670e`, `cellular`, `gps`, `iot`, `lilygo`, `voice`, `sms`

## Images

![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/d3a4d920ff4b.jpg)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/16b7262373bc.jpg)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/fb7c9b2f892f.jpg)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/106384dc314f.png)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/cac64d7b93f4.jpg)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/2e44472f50a3.jpg)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/9c00585880d7.jpg)
![LILYGO T-SIM A7670E](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-sim-a7670e/0ab6e4eaac9a.jpg)

> **Battery Powered:** 18650

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