WT9901C3-SN2 Feature Introduction

1. Introduction

The WT9901C3-SN2 development board launched by Wireless-Tag is an embedded development board based on the WT32C3-S5 module, which is designed around the esp32c3 chipset. The core module, WT32C3-S5, supports both Wi-Fi and low-power Bluetooth (BLE) dual-mode communication, featuring a PCB onboard antenna and 2MB SPI Flash storage, making it ideal for IoT terminal device development.
In addition, this development board can also be used as a simple programmer. The pinout sequence is consistent with the Wireless-Tag programmer ESP-T02.

1.1 🔧 Core Hardware Configuration

• Communication Module: Onboard Wireless-Tag self-developed WT32C3-S5 module, integrated with Wi-Fi and BLE wireless communication protocols. It supports long-range, low-power, and high-connection capabilities, suitable for various IoT scenarios.
• Pin Expansion: Most of the module's GPIO pins are exposed to the side pin headers, making it easy for users to connect peripherals via jumper wires or directly insert the development board into a breadboard for rapid prototyping and debugging.
• Hardware Flexibility: The development board is compact with abundant interfaces, making it suitable for building wireless sensor networks, remote data collection, industrial edge nodes, and other application scenarios.

1.2 🛠️ Design Features

• Onboard RGB LED: The board comes with an onboard RGB LED, allowing users to customize their development.
• Can be Used as a Programmer: By connecting EN and GND, the development board can function as a programmer or serial monitor.
• Breadboard Compatible: The pin spacing supports breadboard development, facilitating users in quickly setting up hardware environments.
• Cost-Effective: Offers great value for money, while supporting both Wi-Fi and BLE features.

1.3 📡 Main Application Scenarios

1. Smart Home: The module supports AT commands and can also be further developed. It is suitable as a Wi-Fi or Bluetooth module for communication with the main controller in IoT smart home applications. It is a highly cost-effective development board.
2. Innovative Development & Education: With its rich interfaces (I2C/SPI/UART), it is ideal for university IoT lab prototyping and development.

1.4 ⚙️ Development Advantages

• Supports AT firmware development, enabling users to quickly add Wi-Fi and Bluetooth functionality to their existing MCU projects.
• Compatible with official ESP-IDF development, offering users full control over peripherals and custom communication protocols.
• Supports Arduino development, making it easy and convenient for multi-module projects.
• Supports MicroPython development, with a lower entry barrier and no need for flashing.

2. Pin Description

2.1 Left Pin Header

2.2 Right Pin Header

3. Power Supply Features

The WT9901C3-SN2 series development board can be powered using one of the following methods:

• External power supply via the USB Type-C port;
• Connect the VCC power input pin using a Dupont wire to the corresponding voltage;
• Connect the 5V power input pin using a Dupont wire to the corresponding voltage.