LILYGO T-HMI Development Board User Manual

T-HMI
User Guide
Version 1.0
Copyright © 2023

About This Guide

This document is intended to help users set up the basic software development environment for developing applications using hardware based on the T-HMI.
Through a simple example, this document illustrates how to use Arduino, including the menu based configuration wizard, compiling the Arduino and firmware download to the ESP32-S3 module.
Release Notes

Introduction

1.1. T-HMI

T-HMI is a development board. It can work independently.
It consists of ESP32-S3 MCU supporting Wi-Fi + BLE communication protocol and motherboard PCB. The screen is 2.8 inch IPS LCD ST7789V.
At the core of this module is the ESP32S3R8 chip.
ESP32-S3 integrates Wi-Fi (2.4 GHz band) and Bluetooth 5.0 solutions on a single chip, along with dual high performance cores and many other versatile peripherals. Powered by 40 nm technology, ESP32-S3 provides a robust, highly integrated platform to meet the continuous demands for efficient power usage, compact design, security, high performance, and reliability.
Xinyuan provides the basic hardware and software resources that empowers application developers to build their ideas around the ESP32-S3 series hardware. The software development framework provided by Xinyuan is intended for rapidly developing Internetof-Things (IoT) applications, with Wi-Fi, Bluetooth, flexible power management and other advanced system features.
The RF frequency range is BLE: 2402-2480MHz，Wi-Fi: 2412-2472MHz
The T-HMI manufacturer is Shenzhen Xin Yuan Electronic Technology Co., Ltd.
1.2. Arduino
A set of cross-platform applications written in Java. The Arduino Software IDE is derived from the Processing programming language and the integrated development environment of the Wiring program. Users can develop applications in Windows/Linux/
MacOS based on Arduino. It is recommended to use Windows 10. Windows OS has been used as an example in this document for illustration purposes.
1.3. Preparation
To develop applications for ESP32-S3 you need:

• PC loaded with either Windows, Linux or Mac operating system
• Tool chain to build the Application for ESP32-S3
• Arduino that essentially contains API for ESP32-S3 and scripts to operate the Tool chain
• The ESP32-S3 board itself and a USB cable to connect it to the PC

Function Indicator Diagram

No.1: Boot Button. No.2: Reset Button. No.3: Power Button.
No.4: Type-C USB: Burning programs, power supply, debugging
No.5: ST7789 RGB IPS LCD Display
No.6: TF Card Seat, TF card function can be used
No.7: Battery connection holder for independent power supply
No.8: 5V DC input holder (Does not work with USB at the same time)
No.9: Grove Seat1. No.10: Grove Seat2. No.11: Grove Seat3.
No.12: On-Board Antenna, enhanced WiFi or Bluetooth signal
No.13: Main Chip MCU ESP32-S3
No.14: External antenna connection holder
E-Label
T-HMI is a development board. Use of electronic label The display method is as follows:

1. Connect USB or lithium battery for power supply, and the program starts to run.
2. The screen will display Label first, and the duration is 2 seconds.

Get Started

2.1. Download the Arduino Software
The quickest how to install the Arduino Software (IDE) on Windows machines
2.1.1. Quick Start Guide
The website provides a quick start tutorial

• Windows: https://www.arduino.cc/en/Guide/Windows
• Linux: https://www.arduino.cc/en/Guide/Linux
• Mac OS X: https://www.arduino.cc/en/Guide/MacOSX

2.1.2. Installation steps for Windows platform Arduino

Enter the download interface, select Windows installer to install directly
2.2. Install the Arduino Software

Wait for installation

Configure

3.1. Download Git
Download the installation package Git.exe

3.2. Pre-build configuration
Click Arduino icon, then right click and select “Open folder where “
Select hardware ->
Mouse Right click ->
Click Git Bash Here
3.3. Cloning a remote repository
$ mkdir espressif
$ cd espressif
$ git clone –recursive https://github.com/espressif/arduino- esp32.git esp32

Connect

You are almost there. To be able to proceed further, connect ESP32-S3 board to PC, check under what serial port the board is visible and verify if serial communication works.

Test Demo

Select File>>Example>>WiFi>>WiFi Scan

Upload Sketch

6.1. Select Board
Tools<<Board<<ESP32S3 Dev Module

6.2. Upload
Sketch -> Upload
6.2. Serial Monitor
Tools ->Serial Monitor

SSC Command Reference

Here lists some common Wi-Fi commands for you to test the module.
7.1. op
Description
op commands are used to set and query the Wi-Fi mode of the system.
Example
op -Q
op -S -o mode
Parameter
Table 6-1. op Command Parameter

• mode = 1: STA mode
• mode = 2: AP mode
• mode = 3: STA+AP mode

7.2. sta
Description
sta commands are used to scan the STA network interface, connect or disconnect AP, and query the connecting status of STA network interface.
Example
sta -S [-s ssid] [-b bssid] [-n channel] [-h] sta -Q
sta -C [-s ssid] [-p password] sta -D
Parameter
Table 6-2. sta Command Parameter

7.3. ap
Description
ap commands are used to set the parameter of AP network interface.
Example
ap -S [-s ssid] [-p password] [-t encrypt] [-n channel] [-h] [-m max_sta] ap –Q
ap –L
Parameter
Table 6-3. ap Command Parameter

7.4. mac
Description
mac commands are used to query the MAC address of the network interface.
Example
mac -Q [-o mode] Parameter
Table 6-4. mac Command Parameter

• mode = 2: MAC address in AP mode.

7.5. dhcp
Description
dhcp commands are used to enable or disable dhcp server/client.
Example
dchp -S [-o mode] dhcp -E [-o mode] dhcp -Q [-o mode] Parameter
Table 6-5. dhcp Command Parameter

• mode = 2 : DHCP server of AP interface.
• mode = 3 : both.

7.6. ip
Description
ip command are used to set and query the IP address of the network interface.
Example
ip -Q [-o mode] ip -S [-i ip] [-o mode] [-m mask] [-g gateway] Parameter
Table 6-6. ip Command Parameter

• mode = 2 : IP address of interface AP.
• mode = 3 : both
-S| Set IP address.
-i ip| IP address.
-m mask| Subnet address mask.
-g gateway| Default gateway.

7.7. reboot
Description
reboot command is used to reboot the board.
Example
reboot
7.8. ram
ram command is used to query the size of the remaining heap in the system.
Example
ram
FCC Caution:
Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
IMPORTANT NOTE:
Note: This equipment has been tested and found to comply with the limits for a Class B digital  device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment .This equipment should be installed and operated with minimum distance 20cm between the radiator& your body.

References

• GitHub - espressif/arduino-esp32: Arduino core for the ESP32
• arduino.cc/en/Guide/Linux
• arduino.cc/en/Guide/MacOSX

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