1.It Is An ESP32-C3 Single-channel Relay Development Board, equipped With ESP-C3-12F Fidelity & BLE Module. All I/O ports are exposed, and it supports AC 90V-250V and DC 7V-12V two power supply modes. It is suitable For ESP32-C3 secondary development and learning, smart home control and other occasions. 2.It Uses Mature and Stable ESP-C3-12F Module and Supports Large-capacity 4M Byte Flash. The I/O Port of the ESP32-C3 Module and the UART program download port are all LED-out, which is convenient for secondary development. 3.It Has Onboard AC-DC and DC-DC Switching Power Supply Modules, and Supports Both AC/DC Power Supply Modes. Onboard ESP32-C3 Module EN power button and IO9 programmable button. 4.ESP32-C3 Supports the Use of IDE Development Tools. It Has 1 Channel 5V Relay, outputs a switch signal, and uses a load whose control working voltage is within AC250V/DC30V. It has a power indicator, a relay indicator, and the module can be observed through the indicator. Key benefits and uses - Flexible power options: operates with AC 90-250V or DC 7-12V, enabling easy use in different environments without separate power adapters. - Ready for development: built around the ESP32-C3-12F module with BLE, suitable for ESP32-C3 secondary development, learning projects, and integration with smart home systems. - Clear access to I/O and programming: all I/O ports are exposed for external connections, and the UART download port is accessible for firmware updates and experiments. - Reliable control: one 5V relay provides a simple digital switch for controlling mains or DC loads within the rated voltage, useful for automation and control tasks. - Simple indicators and controls: onboard power and relay indicators help monitor status at a glance; EN power button and a programmable IO9 button provide convenient control options. - IDE compatibility: supports standard IDE development tools, enabling straightforward programming and testing with familiar workflows. Technical specifications (based on original details) - MCU/Module: ESP32-C3 with 12F Fidelity & BLE module - Memory: supports large-capacity 4M Byte Flash - Relay: 1 channel, 5V control signal - Load compatibility: AC 250V max or DC 30V max - Power supply: supports AC 90V-250V and DC 7V-12V two power modes - I/O access: all I/O ports exposed (LED-out design referenced) - Onboard power features: AC-DC and DC-DC switching power supply modules - User interface: EN power button on ESP32-C3 module; IO9 programmable button - Indicators: power indicator and relay indicator - Development tools: compatible with IDE development environments Use scenarios - Smart home automation: use the relay to switch lighting, fans, or other mains-powered devices under control of BLE-enabled ESP32-C3 routines or a home automation hub. - Prototyping and learning: ideal for ESP32-C3 secondary development, firmware experiments, and BLE-enabled projects, with easy access to I/O and UART programming. - Small automation tasks: implement simple automation or control routines for hobby projects, industrial monitoring, or DIY projects that require a safe, isolated relay switch. This board provides a compact, practical platform for learning, prototyping, and deploying ESP32-C3 based control projects, with flexible power options and clear indicators to support reliable operation.