ESP8266 ESP-01S WiFi Transceiver  Module with 1 Channel Relay Module

The ESP8266 ESP-01S WiFi Transceiver Wireless Module with a Built-in One Channel Relay Module is a compact and cost-effective solution for adding Wi-Fi control to your electronics projects. It combines the popular ESP-01S Wi-Fi module with a relay, allowing you to remotely switch devices on and off over a network.

Core Components and Features:

• ESP-01S Module: This is the core of the device, providing Wi-Fi connectivity (802.11 b/g/n) and processing capabilities. It’s a small, self-contained module with a built-in antenna.
   
• One Channel Relay: This electromechanical switch allows you to control a higher-voltage or higher-current circuit using the ESP8266. It’s typically a Single-Pole Double-Throw (SPDT) relay, giving you both Normally Open (NO) and Normally Closed (NC) contacts.
• Simplified Design: The module is designed to be compact and easy to use, often plugging directly into a breadboard or custom PCB.
• GPIO Pins: The ESP-01S has a limited number of GPIO pins available, some of which are used to control the relay.
• Power Supply: The module typically requires a 3.3V power supply.

How it Works:

The ESP8266 on the module connects to your Wi-Fi network. You can then control the relay remotely using various methods:

• Web Interface: You can create a simple web page hosted on the ESP8266 that allows you to toggle the relay.
• Mobile App: You can develop a mobile app that communicates with the ESP8266 to control the relay.
   
• Home Automation Systems: You can integrate the module with popular home automation platforms like Home Assistant or OpenHAB.
• Custom Protocols: You can create your own communication protocols to control the relay from other devices or software.

Advantages:

• Remote Control: The primary advantage is the ability to control devices remotely over Wi-Fi.
• Simple Integration: The module’s compact design and straightforward functionality make it easy to integrate into projects.
• Cost-Effective: ESP8266-based solutions are generally very affordable.

Versatile Applications:

This module is suitable for a variety of projects, including:

• Smart Home: Controlling lights, fans, appliances, or garage doors remotely.
• Automation: Automating tasks based on schedules or sensor inputs.
• Remote Monitoring: Switching devices on or off based on sensor readings.
• DIY Projects: Creating custom automation solutions for various applications.

Development and Programming:

The ESP-01S can be programmed using various methods:

• Arduino IDE: A popular and user-friendly platform with extensive libraries for the ESP8266.
• ESP-IDF: Espressif’s official SDK for developing ESP8266 applications in C/C++.
   
• MicroPython: A lean and efficient Python implementation that runs on the ESP8266.
   

Key Consideration:

• Limited GPIO: The ESP-01S has a limited number of GPIO pins, so you may need to consider this when designing your project.
   
• Power Supply: Ensure you provide a stable 3.3V power supply to the module.
• Relay Specifications: Pay attention to the relay’s voltage and current ratings to ensure it can handle the load you intend to control.
• Safety: When working with relays and mains voltage, exercise caution and take appropriate safety measures.

In Summary:

The ESP8266 ESP-01S with a built-in relay module is a convenient and affordable way to add Wi-Fi control to your electronic projects. It’s ideal for simple on/off switching applications where remote control is desired. While it has limited GPIO, its ease of use and low cost make it a popular choice for hobbyists and DIY enthusiasts.

Pin Diagram:

Useful Products:

ESP8266 DHT11CH340 Development Board with built-in DHT-11 Sensor

ESP8266 ESP-01 Wifi Module

ESP8266 ESP-01S WIFI Transceiver Module

ESP8266 ESP-12S WIFI Transceiver Module

Arduino UNO R3 Development Board

Arduino Nano Development Board

Arduino Mega Development Board

Raspberry Pi Development Board

USART HMI LCD

Documents:

• NURDspace Wiki (Schematic, Datasheet, & More!)
• Instructables Tutorial
• ESP8266 Community Forum
• AT Command Set
• GitHub (ESP8266)
• GitHub (GCC-Xtensa)
• Graphical Datasheet