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• SIM800 AT Command
• SIM800 Hardware Design
• AXP192
• IP5306

1. InstallVisual Studio Code andPython
2. Search for thePlatformIO plugin in theVisualStudioCode extension and install it.
3. After the installation is complete, you need to restartVisualStudioCode
4. After restartingVisualStudioCode, selectFile in the upper left corner ofVisualStudioCode ->Open Folder -> select theLilyGo-T-Call-SIM800 directory
5. Wait for the installation of third-party dependent libraries to complete
6. Click on theplatformio.ini file, and in theplatformio column
7. Uncomment one of the linessrc_dir = xxxx to make sure only one line works
8. Click the (✔) symbol in the lower left corner to compile
9. Connect the board to the computer USB
10. Click (→) to upload firmware
11. Click (plug symbol) to monitor serial output
12. If it cannot be written, or the USB device keeps flashing, please check theFAQ below

1. InstallArduino IDE

2. InstallArduino ESP32 V2.0.5 or later or latest

3. DownloadLilyGo-T-Call-SIM800 , move to Arduino library folder (e.g. C:\Users\YourName\Documents\Arduino\libraries)

4. Copy all folders inlib folder to Arduino library folder (e.g. C:\Users\YourName\Documents\Arduino\libraries)

5. Open ArduinoIDE ,Tools , Make your selection according to the table below

   Arduino IDE Setting	Value
   Board	ESP32 Dev Module
   Port	Your port
   USB CDC On Boot	Enable
   CPU Frequency	240MHz (WiFi/BT)
   Core Debug Level	None
   Erase All Flash Before Sketch Upload	Disable
   Events Run On	Core1
   Flash Mode	QIO 80MHZ
   Flash Size	4MB (32Mb)
   Arduino Runs On	Core1
   Partition Scheme	Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS)
   PSRAM	QSPI PSRAM
   Upload Mode	UART0/Hardware CDC
   Upload Speed	921600

   • The options in bold are required, others are selected according to actual conditions.

6. File ->Examples ->LilyGo-T-Call-SIM800 ->Arduino Examples

7. SelectPort

8. Clickupload , Wait for compilation and writing to complete

1. Open the serial monitor

2. Short IO0 to GND

3. Press the RESET button on the board, if the serial port communication is normal, then you should see

   ets Jun 8 2016 00:22:57rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))waitingfor download

4. If you can see the above message, it means that the communication is normal, then all you need is to let it enter the waiting download mode, then you can click upload, usually it can solve the problem of not being able to download automatically

• For IP5306 power supply, the 5V power pin connected to the USB board is the output, and the voltage is boosted by IP5306 power supply chip. According to the manual, its maximum output current is 2.4a. Do not connect USB, can 5V input.
• When using AXP192 power supply, the 5V power pin on the board is the input, and it is connected with USB 5V+. There is no other power output on the board except for the 3.3V output.

• It may be due to insufficient USB power supply current, please connect a lithium battery to the board, then plug in the USB and test again.

• If you use theIP5306 version and use a lithium battery to supply power, you must press the reset button to turn on the board.
• If you use theAXP192 power management chip, you need to press and hold the PWR button for 2 seconds to turn on the power supply. By default, the AXP192 will be powered on when the battery is inserted.

• SIM800 built-in firmware update tool Because SIMCOM has not adapted and updated the new system for a long time, it is not necessarily available to upgrade the built-in firmware tool. Most users are stuck waiting for download. Please be informed
• How to update firmware

• Blue LED, controlled by GPIO13
• Red LED, network status light