WT9901C2-SN2 Feature Introduction

1. Introduction

The WT9901C2-SN2 development board, launched by Wireless-tag, is an embedded development board based on the WT018684-S5 module which is designed around Espressif's ESP32-C2. Its core module WT018684-S5 supports dual-mode communication with Wi-Fi and low-power Bluetooth (BLE), uses a PCB onboard antenna, and has built-in 2MB SPI Flash storage, making it suitable for IoT terminal device development.
Additionally, this development board can also function as a simple flasher. It has the same pin sequence as the Wireless-tag flasher ESP-T02.

1.1 🔧 Core Hardware Configuration

• Communication Module: Onboard Wireless-tag's self-developed WT018684-S5 module, integrating Wi-Fi and BLE wireless communication protocols. It features long-range, low-power consumption, and high-connection capacity, suitable for various IoT scenarios.
• Pin Expansion: Most of the module's GPIOs are brought out to pin headers on both sides, facilitating users to connect peripherals via jumpers or directly plug the development board into a breadboard for rapid prototyping and debugging.
• Hardware Flexibility: The development board features a compact structure and rich interfaces, suitable for building wireless sensor networks, remote data acquisition, industrial edge nodes, and other application scenarios.

1.2 🛠️ Design Features

• Onboard RGB LED: Onboard RGB LED for user custom development.
• Can Function as Flasher: Can be used as a flasher or serial monitor by connecting EN and GND.
• Breadboard Compatible: Pin spacing supports breadboard development, facilitating users to quickly set up hardware environments.
• High Cost-Effectiveness: Supports both Wi-Fi and BLE at an affordable price.

1.3 📡 Main Application Scenarios

1. Smart Home: The module supports AT commands and can also be used for secondary development. Suitable for use as a Wi-Fi or Bluetooth module in IoT smart home scenarios to assist the main controller in communication for various scenarios. It is a highly cost-effective development board.
2. Innovative Development and Education: Rich interfaces (I2C/SPI/UART) facilitate connecting peripherals, suitable for IoT laboratory prototyping in universities.

1.4 ⚙️ Development Advantages

• Supports development with AT firmware, facilitating users to quickly integrate Wi-Fi and Bluetooth functionality with their existing MCU.
• Supports official ESP-IDF development, allowing users to freely control peripherals and customize communication methods.
• Supports Arduino development, making multi-module development convenient and easy.
• Supports MicroPython development, lowering the entry barrier as no flashing is required.

2. Pin Description

2.1 Left Pins

2.2 Right Pins

3. Power Characteristics

You can choose one of the following power supply methods for the WT9901C2-SN2 series development board:

• External power supply via the USB Type-C interface;
• Use the VCC power input port and connect the corresponding voltage via Dupont wires;
• Use the 5V power input port and connect the corresponding voltage via Dupont wires;