ESP32 8-Channel Wi-Fi & Bluetooth Relay Module | IOT and Smart Home

Description

ESP32 8-Channel Wi-Fi & Bluetooth Relay Module | IOT and Smart Home

Streamline your IoT and smart home projects with this all-in-one ESP32 8-Channel Relay Module. This board combines the versatility of the popular ESP32-WROOM-32 microcontroller (featuring integrated Wi-Fi and Bluetooth) with eight independently controlled relays, allowing you to switch mains voltage appliances or high-current DC devices directly from your code.

Powered by a standard 12V DC input, the board handles the necessary logic conversion and relay driving (using the onboard ULN2803AG Darlington array), simplifying your circuit design. Each relay channel provides Normally Open (NO), Normally Closed (NC), and Common (COM) contacts accessible via secure screw terminals, making wiring safe and straightforward.

Key Features:

• Integrated ESP32-WROOM-32: Powerful dual-core processor with built-in Wi-Fi and Bluetooth connectivity for wireless control and communication.

• 8 Independent Relay Channels: Control up to eight separate devices.

• Reliable Relays: Equipped with HTV8-DC12V-SH relays.

  • AC Load Rating: 5A @ 250VAC / 10A @ 125VAC

  • DC Load Rating: 20A @ 14VDC (Always verify suitability for your specific load)

• Easy Wiring: Screw terminals for relay outputs (NO, COM, NC) and power input.

• Onboard Relay Driver: ULN2803AG simplifies driving the 12V relays from the ESP32’s 3.3V logic.

• GPIO Breakouts: Unused ESP32 GPIO pins, plus power rails (5V, 3.3V, GND), are brought out to screw terminals or pin headers for connecting sensors or other peripherals. (Check board version for exact pins)

• Status Indicators: Individual LEDs for each relay show its activation status, plus power/status LEDs for the board.

• 12V DC Powered: Operates from a common 12V DC power supply (required, not included).

• Onboard Buttons: Reset and Boot (Flash mode) buttons for development convenience.

Important Programming Note:

This board typically does not include an onboard USB-to-Serial converter. Programming the ESP32 requires an external USB-to-TTL Serial adapter (like FTDI or CH340 based) connected to the dedicated programming header pins (usually marked TX, RX, GND, 5V/3.3V).

Technical Specifications:

• Core Module: Espressif ESP32-WROOM-32

• Connectivity: Wi-Fi 802.11 b/g/n, Bluetooth v4.2 BR/EDR & BLE

• Number of Relay Channels: 8

• Relay Model: HTV6-DC12V-SH (or compatible)

• Relay Coil Voltage: 12V DC

• Relay Contact Rating: 5A/250VAC, 10A/125VAC, 20A/14VDC

• Relay Driver: ULN2803AG (or similar)

• Logic Level: 3.3V (ESP32)

• Input Power: 12V DC (via screw terminal)

• Programming Interface: Requires external USB-to-Serial adapter via header pins (TX/RX/GND/VCC).

• Dimensions: Approx. 147mm x 78mm

(Note: Always adhere to safety precautions when working with mains voltage. Ensure your wiring and load ratings are appropriate.)

Typical Applications:

• Smart Home Automation (Lights, Fans, Appliances)

• IoT Remote Control Systems

• Industrial Process Control

• Aquarium or Terrarium Automation

• Automated Irrigation Systems

• Access Control Systems

Take control of your environment wirelessly! Order the ESP32 8-Channel Relay Module today for your next automation project.