T-Panel S3 get it now

Overview

T-Panel S3 is a compact smart-home control panel built around a dual-MCU architecture: the ESP32-S3 serves as the primary application processor while the ESP32-H2 provides IEEE 802.15.4 / Thread / Zigbee wireless coprocessor capability. The board integrates a 4.0" 480×480 IPS RGB touchscreen, SD card storage, a 16-bit I2C IO expander (XL9535), and an optional field-bus module supporting either RS485 or CAN FD — making it suitable for industrial HMI, smart-home panels, and embedded IoT dashboards.

Quick Start

Hardware Assembly

Arduino

ESP-IDF

Requires ESP-IDF ≥ v5.5.4. Clone the repository and open any example under project/:

git clone https://github.com/Xinyuan-LilyGO/T-Panel.git
cd T-Panel
idf.py set-target esp32s3
idf.py build flash monitor

Related Videos

Key Features

• 4.0" 480×480 IPS LCD with SPI init + RGB parallel data bus (ST7701S controller)
• Dual-MCU: ESP32-S3 (16 MB Flash, 8 MB PSRAM) + ESP32-H2 (4 MB Flash)
• Wi-Fi 2.4 GHz + Bluetooth 5 LE (ESP32-S3) and IEEE 802.15.4 + Bluetooth 5 LE (ESP32-H2)
• Capacitive touch via CST3240 (I2C)
• MicroSD card slot (SPI interface)
• 16-bit IO expander via XL9535 (I2C, address 0x20)
• Optional RS485 (500 kbps) or CAN FD field-bus transceiver module
• Input voltage range: 7–24 V
• Compatible with Arduino, PlatformIO, and ESP-IDF

Specifications

Parameter	Value
SOC	ESP32-S3
Flash	16 MB
PSRAM	8 MB
Co-processor	ESP32-H2-MINI-1 (4 MB Flash)
Display	4.0" 480×480 IPS, ST7701S, SPI+RGB
Touch	CST3240, I2C
Wireless	Wi-Fi 2.4 GHz, BT 5 LE (S3); IEEE 802.15.4, BT 5 LE (H2)
IO Expander	XL9535, 16-bit, I2C
Field-bus	RS485 or CAN FD (optional module)
Input Voltage	7–24 V
Weight
Package size

Pin Diagram

Display (ST7701S)

ST7701S	BL	VSYNC	HSYNC	PCLK	R0	R1	R2	R3	R4	G0	G1	G2	G3	G4	G5	B0	B1	B2	B3	B4
ESP32-S3	GPIO14	GPIO40	GPIO39	GPIO41	GPIO1	GPIO2	GPIO42	GPIO46	GPIO45	GPIO6	GPIO7	GPIO8	GPIO9	GPIO10	GPIO11	GPIO3	GPIO4	GPIO5	GPIO12	GPIO13
XL9535	RESET

Touch (CST3240)

CST3240	SDA	SCL	INT	RESET
ESP32-S3	GPIO17	GPIO18	GPIO21
XL9535				IO4

SD Card

SD Card	CS	SCK	MOSI	MISO
ESP32-S3	GPIO38	GPIO36	GPIO35	GPIO37

IO Expander (XL9535)

XL9535	SDA	SCL
ESP32-S3	GPIO17	GPIO18

XL9535 expanded pins (I2C address 0x20):

Function	XL9535 Pin
ST7701 SPI CS	IO17
ST7701 SPI CLK	IO15
ST7701 SPI MOSI	IO16
LCD RESET	IO5
Touch RESET	IO4
RS485 CON	IO7
ESP32-H2 IO12	IO1
ESP32-H2 IO4	IO2
ESP32-H2 IO5	IO3

RS485 / CAN

RS485 / CAN	TX	RX
ESP32-S3	GPIO16	GPIO15

ESP32-H2

ESP32-H2	TX	RX	EN	BOOT
ESP32-S3	GPIO48	GPIO47	GPIO34	GPIO33

Dimensions

Schematic

T-Panel V1.2 Schematic (PDF)

Datasheet

• ST7701S Display Controller
• YDP395BT001 Display Panel
• CST3240 Touch Controller
• XL9535 IO Expander
• ESP32-H2-MINI-1

Software Libraries

• T-Panel GitHub Repository

FAQ

Changelog

Version	Date	Notes
V1.2		Latest hardware revision
V1.0		Initial release