ESP32-S3-Touch-LCD-4.3B
Product Introduction
Product Overview
ESP32-S3-Touch-LCD-4.3B is a low-cost, high-performance MCU board designed by Waveshare. It supports 2.4GHz Wi-Fi and BLE 5, integrates large-capacity Flash and PSRAM, and features an onboard 4.3inch wide capacitive touch LCD screen, enabling smooth operation of GUI applications such as LVGL. Combined with various peripheral interfaces (e.g., CAN, I2C, and RS485), it allows for rapid development of HMI applications based on the ESP32-S3. The rich functions and interfaces meet the power consumption requirements for application scenarios such as the Internet of Things (IoT), mobile devices, and smart homes.
| SKU | Product |
|---|---|
| 27848 | ESP32-S3-Touch-LCD-4.3B |
| 28141 | ESP32-S3-Touch-LCD-4.3B-BOX |
Product Parameters
| Basic Parameters | |
|---|---|
| Processor | High-performance Xtensa 32-bit LX7 dual-core processor, up to 240 MHz |
| Wi-Fi/Bluetooth | Supports 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5 (LE), onboard antenna |
| Embedded Memory | 512KB SRAM and 384KB ROM |
| Flash | 16MB Flash |
| PSRAM | 8MB PSRAM |
| Power Supply Range | Type-C 5V / DC 7-36V |
| Screen Parameters | |
| Resolution | 800 x 480 |
| Display Colors | 65K colors |
| Display Interface | RGB |
| Display Panel | IPS |
| Viewing Angle | 160° |
| Brightness | 550 Cd/m² |
| Touch Type | Capacitive |
| Touch Panel | Tempered Glass |
| Touch Features | Supports I2C interface control for capacitive touch, 5-point touch, interrupt support |
| Peripheral Interfaces | |
| Communication Interfaces | CAN, RS485, I2C, USB |
| Digital Input | 5~36V, bidirectional optocoupler isolation, supports dry contact and wet contact (NPN or PNP) switch inputs |
| Digital Output | 5~36V, optocoupler isolation, output uses high-current transistor, sink current up to 450mA |
| USB | Integrated full-speed USB |
| Others | |
| Power Consumption | 5V 450mA |
| Operating Temperature | 0℃ ~ 65℃ |
| Dimensions (L×W) | Standard Version: 112.4×75.1mm With Case Version: 116.3×79mm |
Features
- Powered by a high-performance Xtensa 32-bit LX7 dual-core processor, with a main frequency of up to 240MHz
- Supports 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5 (LE) with an onboard antenna
- Built-in 512KB SRAM and 384KB ROM, stacked with 16MB Flash and 8MB PSRAM
- Onboard 4.3inch LCD screen, 800 × 480 resolution, 65K colors
- Supports I2C interface control for capacitive touch, with 5-point touch, and supports interrupts
- Onboard CAN, RS485, I2C interfaces, TF card slot, and integrated full-speed USB
- Supports precise control features like flexible clocking and independent module power supply settings, enabling low-power modes for multiple scenarios
Onboard Resources
- ESP32-S3-WROOM-1-N16R8
Wi-Fi/Bluetooth SoC module, 240MHz operating frequency
Stacked 8MB PSRAM and 16MB Flash - TF Card Slot
For connecting TF cards - USB Type-C Port
For power supply and program flashing - BOOT Button
Press and hold while powering on for program flashing - RESET Button
Press to reset the ESP32S3 - Optocoupler Isolation
Isolates and protects I/O pins on the board - Screen Touch Connector
Connects the touch screen FPC - 4.3inch Screen Connector
Connects the LCD display FPC - CAN and RS485 Termination Resistor Switches
Balance resistor switches for the bus, disabled by default - Battery Connection Switch
ON: Connect battery
OFF: Disconnect battery - 3.7V Single-Cell Lithium Battery 1.25 Interface
MX1.25 interface, compatible with all 3.7V lithium batteries
- Status Indicators
DONE: Lithium battery charging complete indicator
CHG: Lithium battery charging indicator
PWR: Power indicator
(When power is connected, but no battery is connected or the switch is off, CHG will blink, and DONE will light on) - 7-36V DC Power Supply
Wide voltage input interface, supports 7-36V DC power - I2C Interface
VOUT outputs 5V/3.3V (switchable via onboard resistor, select one) - CAN Interface
CAN 2.0 compliant - RS485 Terminal Block
Supports 485 bus communication - Digital Output
5～36V, open-drain output, output load 450mA/channel (MAX) - Input Signal Common Terminal
Not connected (floating): Dry contact (passive) input
Connected to power positive: Low-level trigger, NPN-type wet contact (active) input, voltage 5V-36V DC
Connected to power negative: High-level trigger, PNP-type wet contact (active) input, voltage 5V-36V DC - Digital Input
5～36V, dry contact / wet contact (NPN or PNP type) - RTC Battery Holder
Specification: CR927
Interface Description
When using the ESP32-S3-Touch-LCD-4.3B, it is important to understand the hardware connections of the different peripherals.
LCD Interface: Connector for the LCD cable (click to expand)
| ESP32-S3 | LCD | Description |
|---|---|---|
| GPIO0 | G3 | Green data bit 3 |
| GPIO1 | R3 | Red data bit 3 |
| GPIO2 | R4 | Red data bit 4 |
| GPIO3 | VSYNC | Vertical sync signal |
| GPIO5 | DE | Data enable signal |
| GPIO7 | PCLK | Pixel clock signal |
| GPIO10 | B7 | Blue data bit 7 |
| GPIO14 | B3 | Blue data bit 3 |
| GPIO17 | B6 | Blue data bit 6 |
| GPIO18 | B5 | Blue data bit 5 |
| GPIO21 | G7 | Green data bit 7 |
| GPIO38 | B4 | Blue data bit 4 |
| GPIO39 | G2 | Green data bit 2 |
| GPIO40 | R7 | Red data bit 7 |
| GPIO41 | R6 | Red data bit 6 |
| GPIO42 | R5 | Red data bit 5 |
| GPIO45 | G4 | Green data bit 4 |
| GPIO46 | HSYNC | Horizontal sync signal |
| GPIO47 | G6 | Green data bit 6 |
| GPIO48 | G5 | Green data bit 5 |
| CH422G | LCD | - |
| EXIO2 | DISP | Backlight enable pin |
Touch Interface: Connector for the touch cable (click to expand)
| ESP32-S3 | Touch | Description |
|---|---|---|
| GPIO4 | TP_IRQ | Touch interrupt pin |
| GPIO8 | TP_SDA | Touch data pin (I2C) |
| GPIO9 | TP_SCL | Touch clock pin (I2C) |
| CH422G | Touch | - |
| EXIO1 | TP_RST | Touch reset pin |
USB Interface: Used for power supply and flashing (click to expand)
| ESP32-S3 | USB | Description |
|---|---|---|
| GPIO19 | USB_DN | Data line D- |
| GPIO20 | USB_DP | Data line D+ |
TF Card Interface: Connector for the TF card (click to expand)
| ESP32-S3 | TF | Description |
|---|---|---|
| GPIO11 | MOSI | TF card input pin |
| GPIO12 | SCK | TF card clock pin |
| GPIO13 | MISO | TF card output pin |
| CH422G | TF | - |
| EXIO4 | SD_CS | TF card chip select, active low |
RS485 Interface: Automatic transceiver mode switching (click to expand)
| ESP32-S3 | RS485 | Description |
|---|---|---|
| GPIO43 | RS485_RXD | Data input |
| GPIO44 | RS485_TXD | Data output |
CAN Interface: Implements CAN bus transceiver control (click to expand)
| ESP32-S3 | CAN | Description |
|---|---|---|
| GPIO15 | CANTX | Data output |
| GPIO16 | CANRX | Data input |
RTC Interface: Onboard PCF85063 provides clock and calendar information (click to expand)
| ESP32-S3 | RTC | Description |
|---|---|---|
| GPIO8 | RTC_SDA | RTC Data Pin |
| GPIO9 | RTC_SCL | RTC Clock Pin |
I2C Interface: Connects to the I/O expander chip, touch interface, and external interfaces (click to expand)
| ESP32-S3 | I2C | Description |
|---|---|---|
| GPIO8 | SDA | I2C data pin |
| GPIO9 | SCL | I2C clock pin |
I2C Interface: Connects to the IO expander chip, touch interface, and external interfaces (click to expand)
| CH422G | DI/DO | Description |
|---|---|---|
| EXIO0 | DI0 | Digital Input 0 |
| EXIO5 | DI1 | Digital Input 1 |
| OD0 | DO0 | Digital Output 0 |
| OD1 | DO1 | Digital Output 1 |
MX1.25 Battery Interface: The development board uses the efficient charging/discharging management chip CS8501, which can boost a single-cell lithium battery to 5V. The current charging current is 580mA. Users can change the charging current by replacing resistor R45. For details, please refer to the ESP32-S3-Touch-LCD-4.3B Schematic
Dimensions
Development Methods
The ESP32-S3-Touch-LCD-4.3B supports two development frameworks: Arduino IDE and ESP-IDF, providing developers with flexible choices. You can select the appropriate development tool based on project requirements and personal preference.
Both development methods have their own advantages. Developers can choose based on their needs and skill levels. Arduino is simple to learn and quick to start, suitable for beginners and non-professionals. ESP-IDF provides more advanced development tools and stronger control capabilities, suitable for developers with professional backgrounds or higher performance requirements, and is more appropriate for complex project development.
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Arduino IDE is a convenient, flexible, and easy-to-use open-source electronics prototyping platform. It requires minimal foundational knowledge, allowing for rapid development after a short learning period. Arduino has a huge global user community, providing a vast amount of open-source code, project examples, and tutorials, as well as a rich library ecosystem that encapsulates complex functions, enabling developers to implement various features rapidly. You can refer to the Working with Arduino to complete the initial setup, and the tutorial also provides related demos for reference.
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ESP-IDF, short for Espressif IoT Development Framework, is a professional development framework launched by Espressif Systems for its ESP series of chips. It is based on C language development and includes compilers, debuggers, flashing tools, etc. It supports development via command line or integrated development environments (such as Visual Studio Code with the Espressif IDF plugin), which provides features like code navigation, project management, and debugging. We recommend using VS Code for development. For the specific configuration process, please refer to the Working with ESP-IDF. The tutorial also provides relevant demos for reference.