The ESP32 One-Channel Relay Module is a compact and reliable Wi-Fi and Bluetooth-enabled switching solution designed to control a single high-voltage or high-current load using the ESP32 microcontroller. It features a 5V DC SPDT relay, allowing flexible switching between Normally Open (NO) and Normally Closed (NC) contacts based on application requirements.

For enhanced safety and noise immunity, the module uses opto-isolated relay control through a PC817 optocoupler, electrically separating the ESP32’s 3.3V logic from the relay’s 5V drive circuitry. The board integrates all essential support components, including relay driver circuitry, flyback diode protection, onboard 5V and 3.3V voltage regulators, status indicator LEDs, and convenient connector interfaces.
This module is suitable for both educational use and professional applications in automation, IoT, and remote switching systems.

Specifications:

• Microcontroller: ESP32-WROOM-32D
• Relay type: 5V DC SPDT relay
• Relay contacts: NO / NC / COM
• Control isolation: PC817 optocoupler
• Operating logic voltage: 3.3V
• Relay drive voltage: 5V
• Wireless connectivity: Wi-Fi & Bluetooth
• GPIO availability: 8 accessible GPIO pins
• Communication interface: UART
• Indicator LEDs: Power, Relay status, User-configurable
• Skill Level: Beginner to Professional

Key Features:

• Industrial-grade design for reliable operation
• Optocoupler isolation for safe ESP32-to-relay interfacing
• 5V DC SPDT relay for high-voltage or high-current load control
• On-board 5V and 3.3V voltage regulators for stable power supply
• Indicator LEDs for power status, relay status, and user control
• Reset, Boot, and user-configurable switches included
• UART interface for programming and external communication
• Automatic Reset & Boot support via DTR and RTS signals or manual buttons

User Guide: Click Here

If you have any issues, please contact the manufacturer directly at [email protected].