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LilyGo logo

🌟LilyGo A7670X ESP32 Version🌟

Overview

  • This page introduces the hardware parameters related to LilyGo A7670X ESP32 Version

Product

Product SOC Flash PSRAM
T-A7670E ESP32 ESP32-WROVER-E 4MB(Quad-SPI) 8MB(Quad-SPI)
T-A7670SA ESP32 ESP32-WROVER-E 4MB(Quad-SPI) 8MB(Quad-SPI)
T-A7670G ESP32 ESP32-WROVER-E 4MB(Quad-SPI) 8MB(Quad-SPI)

Modem differences

Model GPS Phone Call SMS Frequency band
A7670E-FASE ✅ ✅ ✅ LTE-FDD:B1/B3/B5/B7/B8/B20 GSM:900/1800
A7670SA-FASE ✅ ✅ ✅ LTE-FDD:B1/B2/B3/B4/B5/B7/B8/B28/B66 GSM:850/900/1800/1900
A7670E-LNXY-UBL ❌ ❌ ❌ LTE-FDD:B1/B3/B5/B7/B8/B20
A7670SA-LASE ❌ ✅ ✅ LTE-FDD:B1/B2/B3/B4/B5/B7/B8/B28/B66 GSM:850/900/1800/1900
A7670SA-LASC ❌ ✅ ✅ LTE-FDD:B1/B2/B3/B4/B5/B7/B8/B28/B66 GSM:850/900/1800/1900
A7670G-LLSE ❌ ✅ ✅ LTE-FDD:B1/B2/B3/B4/B5/B7/B8/B20/B28/B66 LTE-TDD:B34/B38/B39/B40/B41 GSM:850/900/1800/1900
A7670G-LABE ❌ ✅ ✅ LTE-FDD:B1/B2/B3/B4/B5/B7/B8/B12/B13/B18/B19/B20/B25/B26/B28/B66 LTE-TDD:B34/B38/B39/B40/B41 GSM:850/900/1800/1900
A7670E-LASE ❌ ✅ ✅ LTE-FDD:B1/B3/B5/B7/B8/B20 GSM:900/1800

Important

How to check the specific model version of the modem? Sending AT+SIMCOMATI can return the firmware version and hardware version used.

Please note that whether the GNSS IPEX antenna connector is on the PCB or not depends on the actual modem version. The A7670G modem does not have internal GPS functionality, regardless of whether GPS is included in your order. If you purchased the A7670G with GPS, you will need to use an external GPS module. A7670G+GPS orders use an external GPS module and can only use ExternalGPS_A7670G_Only Example. Other GPS examples cannot be used.

PlatformIO Quick Start

  1. Install the CH9102 USB bridge driver for the first time.
  2. Install Visual Studio Code and Python
  3. Search for the PlatformIO plugin in the Visual Studio Code extension and install it.
  4. After the installation is complete, you need to restart Visual Studio Code
  5. After restarting Visual Studio Code, select File in the upper left corner of Visual Studio Code -> Open Folder -> select the LilyGo-Modem-Series directory
  6. Wait for the installation of third-party dependent libraries to complete
  7. Click on the platformio.ini file, and in the platformio column
  8. Cancel the ; symbol in front of the line default_envs = T-A7670X and use T-A7670X as the default environment
  9. Uncomment one of the lines src_dir = xxxx to ensure that only one line is valid. For example, to enable src_dir = examples/ATdebug, remove the leading ; symbol and save the file. The ATDebug example will now be compiled.
  10. Click the (✔) symbol in the lower left corner to compile
  11. Connect the board to the computer USB-C , Micro-USB is used for module firmware upgrade
  12. Click (→) to upload firmware
  13. Click (plug symbol) to monitor serial output
  14. If it cannot be written, or the USB device keeps flashing, please check the FAQ below

Arduino IDE quick start

  1. Install the CH9102 USB bridge driver for the first time.

  2. Install Arduino IDE

  3. Install Arduino ESP32

  4. Copy all folders in the lib directory to the Sketchbook location directory. How to find the location of your own libraries, please see here

    • Windows: C:\Users\{username}\Documents\Arduino
    • macOS: /Users/{username}/Documents/Arduino
    • Linux: /home/{username}/Arduino

  5. Open the corresponding example

    • Open the downloaded LilyGo-Modem-Series
    • Open examples
    • Select the sample file and open the file ending with ino

  6. On Arduino ISelect the corresponding board in the DE tool project and click on the corresponding option in the list below to select

    Name Value
    Board ESP32 Dev Module
    Port Your port
    CPU Frequency 240MHZ(WiFi/BT)
    Core Debug Level None
    Erase All Flash Before Sketch Upload Disable
    Events Run On Core1
    Flash Frequency 80MHZ
    Flash Mode QIO
    Flash Size 4MB(32Mb)
    JTAG Adapter Disabled
    Arduino Runs On Core1
    Partition Scheme Huge APP (3MB No OTA/1MB SPIFFS)
    PSRAM Enable
    Upload Speed 921600
    Programmer Esptool
    • Partition Scheme Please select according to the actual application. For example, select Huge APP (3MB No OTA/1MB SPIFFS) , For more partitioning schemes, please see here

  7. In the open sketch, select the utilities.h file and uncomment the line // #define LILYGO_T_A7670X. Delete the // and save the file to use this board as the default configuration.

    board_select

  8. Upload sketch

Important

  1. Unable to upload any code? Please see the FAQ below
  2. When opening the Arduino IDE, you will be prompted that there are new libraries that can be updated. Please do not click update. There is no guarantee that it can be compiled, run, etc. after the update. Make sure that the board is running normally before deciding whether to update. You have to Know that problems may occur after updating due to library differences, or the default configuration (such as TinyGSM) will be overwritten.
  3. If it runs abnormally after the update, please follow Article 4 of the Arduino Quick Start to delete the directory in libraries, and drag the folder in lib into the libraries directory again.

📍 Pins Map

Name GPIO NUM Free
Peripheral power control 12 ❌
Modem TX 26 ❌
Modem RX 27 ❌
Modem PWR 4 ❌
Modem RESET 5 ❌
Modem RING 33 ❌
Modem DTR 25 ❌
SD SCK 14 ❌
SD MISO 2 ❌
SD MOSI 15 ❌
SD CS 13 ❌
Battery ADC Pin 35 ❌
Solar ADC Pin 36 ❌
Default SDA 21 ✅️
Default SCL 22 ✅️
  • Peripheral power control pin. When using SD or modem, this GPIO must be set to high level, otherwise these functions cannot be used.
  • ESP32 models GPIO33 and above can only be set as input, not output

Important

ESP32 version Since the SD card uses IO2 as CS, you cannot upload software in the Arduino IDE when you insert the SD card, so you must remove the SD card when uploading new code

⚡ Electrical parameters

Features Details
🔗USB-C Input Voltage 5V
⚡Solar Input Voltage 5~6V
⚡USB-C/Solar Charge Max Current 500mA
🔋Battery Voltage 3.7V
📍VBUS ( Pin header) 5V
📍VBAT ( Pin header) 4.2V

Tip

  1. The onboard JST2.0 interface is only used to connect the solar panel to charge the battery, and cannot provide power to the board from this interface
  2. It is recommended to use a solar panel with an output voltage of 6V or 5V and a power of about 5-10W. Solar energy can only charge the battery. Without the battery, the panel cannot supply power. Please note that this is only a suggestion. It is not necessary to use a 5-10W solar panel. 1W is also acceptable. The size of the solar panel determines the current and speed of solar charging. Please note that depending on the environment, the sunshine time may not exceed one hour per day. At this time, if the solar panel is too small and the light is not sufficient, it cannot be charged.
  3. Connect the VBUS pin to the USB-C power supply. If USB-C is present, the VBUS voltage is equal to the USB-C voltage. If USB-C is not present, there is no voltage on VBUS.
  4. Connect the VBAT pin to the positive terminal of the battery. This pin can be used to connect an external battery directly to the VBAT pin. When using an external battery, it is best not to connect the battery to the development board's 18650 battery holder unless the battery's parameters are similar to the external battery. Batteries connected to the VBAT pin can be charged using the onboard charge management.

⚡Battery Protector Description

Features Details
Over-Voltage Threshold 4.30V
Under-Voltage Threshold 2.4V
Over-Discharge Current 3A
ChipName DW06D

Button Description

Button Function
IO0(Close to esp) Customizable function/Download mode
RST Reset devices button
BOT(Close to modem) Modem Upgrade mode
  • Press and hold the IO0 button before powering on. The board is now in waiting mode for downloading.
  • Before powering on, keep the BOT button pressed to put the modem into firmware update mode.
  • The above naming method is subject to the board silk screen printing

Antenna Description

Function
SIM LTE Main antenna interface
GNSS GPS active antenna interface
  • The above naming method is subject to the board silk screen printing

LED Description

FUNCTION COLOR
MODEM STATUS RED (Near the modem)
MODEM NETWORK STATE RED (Near the modem)
CHARGE LED BLUE (Near the battery switch)
CHARGE DONE LED BLUE (Near the battery switch)
  • Modem Status light and network status led cannot be turned off

Resource

FAQ

  • ESP32 (V1.x) version T-A7670X known issue

    1. When using battery power mode, BOARD_POWERON_PIN (IO12) must be set to a high level after ESP32 starts, otherwise a reset will occur.
    2. Modem cannot be put into sleep mode when powered by USB-C. For a solution, see here

  • If the above method still fails to upload the sketch, please follow the method below to test whether the USB2TTL communication is normal.

    1. Connect USB-C to PC
    2. Open the serial monitor and adjust the baud rate to 115200
    3. Press the RST button on the board to restart
    4. If you can see the startup information, it means that the USB2TTL communication is normal. If nothing is displayed in the serial monitor, it may be that the USB2TTL bridge is damaged

  • Upgrade modem firmware

    1. T-A76XX Upgrade docs / Video

  • Unable to detect SIMCard?

    1. Need to insert the SIMCard into the board first and then power on to detect the SIM card. If the order is reversed, it will report that the SIMCard cannot be detected.

  • Can't upload any sketch，Please enter the upload mode manually.

    1. Connect the board via the USB cable
    2. Press and hold the IO0 button , While still pressing the IO0 button
    3. Press RST button
    4. Release the RST button
    5. Release the IO0 button
    6. Upload sketch

  • What the onboard switch does

    1. When using the internal battery pack, the switch will work normally to power/power down the board. However, if an external battery pack is used and connected to the VBAT pin, the switch will be bypassed, meaning the only way to shut down is to disconnect the battery.
    2. The switch is only for battery power and has no effect when plugged into USB

  • About VBUS Pin

    1. VBUS Pin and USB-C are on the same line. Only when USB-C is connected, VBUS has voltage
    2. When only the battery is connected, VBUS has no voltage output
    3. If you want to connect an external power supply without connecting USB-C, VBUS Pin is the only voltage input pin. Please note that the maximum input of VBUS Pin is 5V, do not exceed 5V

  • How to use voice call example?

    1. Voice calls require external welding of the condenser microphone and speaker. Generally, the board silk screen is marked SPK. The speaker needs to be welded, and the MIC silk screen position needs to weld the condenser microphone. , T-A7670 the microphone and speaker connections are located issue/130

  • Can other GPS antennas be used?

    1. The external GPS antenna must be an active GPS antenna with a 3.3V power supply. For example, the MK-76 supports 2.5-5.5V and is compatible. Most active GPS antennas support 2.5-5.5V power. Please refer to the GPS antenna datasheet for details.