eSync ESP32-C3 Smart Switch DIY Dev Board

The eSync ESP32-C3 Smart Switch DIY Dev Board is a compact and powerful IoT automation solution designed for smart home and industrial control projects. Built around the ESP32-C3 RISC-V processor, it offers integrated Wi-Fi and Bluetooth 5.0 (BLE) for seamless wireless connectivity. This board directly operates on 220V AC mains using an onboard Hi-Link power module, eliminating the need for external power supplies. Equipped with dual 7A relays, it allows reliable control of electrical appliances like lights, fans, and sockets. The USB Type-C interface ensures easy programming and debugging, while GPIO-based manual switch inputs enable local control. Pre-soldered and ready to use, it supports OTA firmware updates, making it ideal for developers, hobbyists, and automation enthusiasts building scalable IoT solutions. Features: ESP32-C3-WROOM-02 with RISC-V 32-bit core up to 160 MHz Built-in Wi-Fi (802.11 b/g/n) and BLE 5.0 connectivity Dual 7A relays for AC load control Direct 220–240V AC input (no external PSU required) Onboard Hi-Link HLK-PM01 AC-DC converter USB Type-C for flashing and serial communication Manual wall-switch interface with GPIO inputs OTA firmware update capability Specifications: MCU: ESP32-C3-WROOM-02 CPU: RISC-V 32-bit, up to 160 MHz Wi-Fi: IEEE 802.11 b/g/n (2.4 GHz) Bluetooth: BLE 5.0 Input Voltage: 110–240 V AC, 50/60 Hz Input Current: 0.2A Output Voltage: 5V DC Output Current: 0.6A Output Power: 3W PSU: Hi-Link HLK-PM01 (5V DC) Regulator: AMS1117 (3.3V) Relay: 2 × G5LE-1, 7A @ 220V AC Relay Logic: Active High Switch Inputs: 2 × GPIO (Active Low) Interface: USB Type-C UART: GPIO20 (TX), GPIO21 (RX) LED: GPIO1 status indicator Dimensions: 65 x 44 x 20 mm Weight: 57 g Package Includes: 1 x eSync ESP32-C3 Smart Switch DIY Dev Board

Specifications

MCU	ESP32-C3-WROOM-02
CPU	RISC-V 32-bit, up to 160 MHz
Wi-Fi	IEEE 802.11 b/g/n (2.4 GHz)
Bluetooth	BLE 5.0
Input Voltage	110–240 V AC, 50/60 Hz
Shipping Weight	0.060 kg
Shipping Dimensions	9 × 6 × 3 cm