Wireless-tag WT32-SC01

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Summary

Overview

Board Size

Details the physical dimensions and mounting hole specifications of the WT32-SC01 development board.

Hardware Resource

ESP32-WROVER-B Module

Describes the ESP32-WROVER-B module, its Wi-Fi/BT capabilities, and memory configuration (Flash/PSRAM).

TP Interface

Specifies the capacitive touchpad interface, including I2C, pin count, and spacing.

LCM Display Interface

Details the 3.5-inch LCM display, its SPI interface, resolution, and screen model.

Power Management

Explains the board's 3.3V power supply and its isolation for system stability.

External Power Interface

Defines the external power input, specifying voltage range (5-9V) and current recommendations.

RST Key

Describes the function of the RST key, used to reset the ESP32 EN pin.

Type-C Interface

Details the USB Type-C interface for power, UART communication, and firmware downloads.

Expansion Board Interface

Covers the 2x20Pin expansion interfaces for adding functionality.

Power Indicator

Explains the red LED power indicator that lights up when the USB cable is connected.

UART Communication Indicator

Describes the TXD and RXD indicators that flash during UART data flow.

SMD-RAP

Specifies the suitability of SMD-RAP for M3 screws and provides dimensions.

Power On Instructions

Power Supply

Recommends input current for USB-C (1A/2A) and external power (5-9V, >2A).

Precautions

Advises on FPC cable insertion and testing TestPad voltages for abnormal behavior.

Board Electrical Parameters

Test Environment

Specifies operating conditions: 25°C ambient temperature and 5.0V voltage ripple < 100mA.

Test Parameters

Lists normal working current (240mA) and sleep current (<18mA) as average values.

Firmware Burning

Step One

Connect WT32-SC01 to PC via USB-C for automatic firmware download.

Step Two

Configure download tool: address, clock, flash size, SPI mode, COM port, baud rate.

Step Three

Press the reset button to run the newly burned firmware.

Function Development

Screen Brightness Adjustment

Control LCD backlight on/off or brightness using GPIO23 via PWM modulation.

Graphical Interface Development

Develop GUIs using an online platform similar to MIT App Inventor for rapid development.

Blockly Development

Refer to the provided link for the Blockly development manual for visual programming.

The WT32-SC01 is a development board designed for visual touch screen applications, offering a comprehensive platform for GUI firmware development. It supports rapid development using building blocks, similar to MIT APP Inventor, and aims to continuously improve graphical interface development and driver code blocks.

Function Description:

The WT32-SC01 serves as a versatile development board for creating custom control panels and smart devices. It integrates an ESP32-WROVER-B module, which is a general-purpose Wi-Fi + Bluetooth + BLE MCU module. This module provides powerful functions and wide applications, suitable for low-power sensor networks and demanding applications such as voice coding, audio streaming, and MP3 decoding.

The board features a 3.5-inch LCD screen with a resolution of 320x480 and a capacitive touch panel that supports two-point touch. The LCD display interface uses SPI, connected to the ESP32's hardware HSPI interface, with an operating clock frequency up to 80MHz. The screen parameters include a pixel density of 165PPI and model WT-352215-A2.

Power management is handled by two LDOs providing 3.3V output to the board and external expansion boards. An external power interface is reserved to prevent interference with the ESP32's power supply. The board also includes a RST Key for resetting the device.

A Universal USB-C interface (Type-C) is used for power supply, UART communication, and firmware download. The hardware download circuit implements data flow control, enabling one-click automatic firmware download.

The board offers expansion capabilities through two 2.0mm pitch, 2x20Pin expansion board interfaces (interfaces 8 and 9). These interfaces are connected Pin to Pin, allowing for flexible installation of expansion boards in different directions. If the IOs of two expansion boards do not conflict, both can be inserted simultaneously to achieve dual expansion functions.

Indicators include a red power indicator that lights up when the USB cable is plugged in, and TXD/RXD indicators for UART communication that flash when data flows.

Important Technical Specifications:

Main Controller: ESP32-WROVER-B Module
MCU Module Parameters: 8Mbyte PSRAM + 4Mbyte Flash
Display: 3.5-inch LCD screen
Resolution: 320xRGBx480
Touch Panel: Capacitive, supports two-point touch
Display Interface: SPI, 0.5mm spacing, 24pin, 80MHz clock frequency
Touch Panel Interface: I2C, 0.5mm spacing, 6pin, flip-down type
Power Supply: USB Type-C 5V, external power input 5V-9V
Recommended Input Current:
- ≥1A (without expansion boards)
- ≥2A (with expansion boards)
Load Current (external power): >2A
Expansion Interfaces: Two 2.0mm pitch, 2x20Pin interfaces (Pin to Pin connection)
Operating Temperature: Room temperature 25 °C
Power Supply Voltage Ripple: V < 100mA
Normal Working Current: 240mA (Average current)
Working Current under Sleep: Less than 18mA (Average current)
SMD-RAP: Suitable for M3 screw

Usage Features:

Firmware Burning: The WT32-SC01 supports automatic firmware download via the USB-TypeC data cable using ESP32 Flash_Download_Tools. Users select the firmware path, set the address (usually 0X00), tick the front, set the system clock to 40MHz, choose Flash size (32Mbit recommended), set SPI MODE to DIO, select the correct COM port, and set the serial port baud rate (up to 1152000bps). After configuration, clicking "Start" initiates the burning process.
Screen Brightness Adjustment: The LCD backlight is controlled by GPIO23 of the ESP32. Users can turn the backlight on/off or adjust its brightness using PWM modulation.
Graphical Interface Development: The online platform (http://esp32.8ms.xyz/login) allows for rapid development of graphical interfaces using a building block approach, similar to MIT APP Inventor. This simplifies the creation of user interfaces and integrates driver code blocks.
Blockly Development: The platform supports Blockly development, with relevant documentation available at https://doc.8ms.xyz/ under "8ms Manual".
Expansion Capabilities: The two expansion board interfaces allow users to add various functional modules, meeting diverse application needs. The Pin to Pin connection simplifies installation and allows for flexible orientation.

Maintenance Features:

Precautions: Before powering on, ensure that the FPC cables of the TP and LCM screens are correctly inserted into their respective sockets to prevent damage.
Troubleshooting: If the development board exhibits abnormal behavior, users should first test the voltage of the three TestPad points: PP5V (USB input 5V), PP3V3_1 (3.3V power for the board), and PP3V3_2 (3.3V power for external expansion boards).
Reset Functionality: After firmware burning, pressing the reset button on the back of the development board will start running the newly installed firmware.