ESP-01 Wi-Fi Relay Module

ESP-01 Wi-Fi Relay Module Overview

The ESP-01 Wi-Fi Relay Module is a compact ESP8266-based Wi-Fi relay designed to add wireless control to lights, fans and other appliances. By combining the popular ESP-01 module with a single-channel 5V relay, this board provides an affordable, easy-to-integrate solution for smart home and IoT projects.

Key Benefits

• Wi-Fi enabled switching using the reliable ESP8266 (ESP-01) chipset.
• High switching capacity for common household loads.
• Firmware flexibility: works with Tasmota, ESPHome, Blynk, Home Assistant and custom code.
• Compact size for mounting inside enclosures or retrofit switches.

Specifications

• Wi-Fi module: ESP8266 ESP-01
• Relay: Single-channel 5V relay
• Relay rating: 250V AC / 10A or 30V DC / 10A
• Isolation: Optocoupler isolation between control and relay circuits
• Power: Onboard power supply (5V input recommended for the relay and ESP-01 adapter)
• Indicators: Status LED(s) for power and relay state

Supported Firmware and Integrations

The module supports a variety of firmware and IoT platforms for easy integration into existing smart home systems:

• Tasmota: Quick flashing for MQTT and HTTP control.
• ESPHome: Native Home Assistant integration using YAML configuration.
• Blynk: Mobile app control and cloud integration for DIY projects.
• Custom firmware: Program via serial or use OTA (over-the-air) updates for remote firmware deployment.

Applications

• Smart lighting and switched circuits
• Remote control of fans, pumps and low-to-medium power appliances
• DIY Wi-Fi controlled switches and smart plugs (inside suitable enclosures)
• Home security and automation scenes triggered by sensors or schedules
• IoT prototypes and proof-of-concept projects

Installation and Wiring Tips

• Use proper gauge wiring and follow local electrical codes when switching AC mains.
• Provide a stable 5V supply for the relay coil and ensure the ESP-01 has a regulated 3.3V supply when programming or running custom firmware.
• Use the optocoupler isolation when available to separate low-voltage control signals from mains switching for added safety.
• Test the relay with the load disconnected before final installation to confirm firmware and control logic.

Safety and Best Practices

• Disconnect mains power before wiring the relay to avoid electric shock.
• Enclose the module in a suitable insulated housing if used with mains voltages.
• Observe the relay ratings: do not exceed 250V AC / 10A or 30V DC / 10A.
• Consider using external contactors or SSRs for high inrush or inductive loads (motors, compressors).

What is Included

• ESP-01 Wi-Fi Relay Module (ESP8266 ESP-01 mounted with single 5V relay)
• Documentation and basic wiring diagram

Compatibility Notes

The board is ideal for hobbyists, makers and integrators building smart switches and IoT devices. It is compatible with popular smart home platforms, but may require flashing of third-party firmware (Tasmota, ESPHome) for full platform integration.

Note: Images are for illustration purposes. Actual product may vary slightly in design or component layout.