5V ESP8266 WiFi Relay Module

5V ESP8266 WiFi Relay Module Documentation

Overview

The 5V ESP8266 WiFi Relay Module is a compact, low-cost Internet of Things (IoT) component that integrates a WiFi enabled microcontroller (ESP8266) with a relay module. This module allows users to control devices remotely using WiFi connectivity and provides a simple way to automate devices using the ESP8266's microcontroller capabilities.

Features

WiFi enabled ESP8266 microcontroller
 On-board relay module (max 5V, 10A)
 Supports HTTP, UDP, and TCP protocols
 Compatible with various programming languages (e.g., MicroPython, Lua, C++)

Pinouts

| Pin | Function |
| --- | --- |
| VCC | Power supply (5V) |
| GND | Ground |
| RX | Serial receive (TX on ESP8266) |
| TX | Serial transmit (RX on ESP8266) |
| S | Relay switch control |
| IN | Input for relay module |

Code Examples

### Example 1: Remote Relay Control using HTTP Requests

This example demonstrates how to control the relay module remotely using HTTP requests. We'll use a simple web server running on the ESP8266 to control the relay.

Hardware Requirements

5V ESP8266 WiFi Relay Module
 Power supply (5V, 10A)
 Computer or mobile device with internet connection

Software Requirements

MicroPython firmware installed on the ESP8266
 Web browser or HTTP client software (e.g., Postman)

Code
```python
import machine
import network
import urequests

# Initialize WiFi
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('Your_WiFi_SSID', 'Your_WiFi_Password')

# Initialize relay module
relay = machine.Pin(4, machine.Pin.OUT)

# Create a simple web server
def web_server():
    while True:
        req = urequests.get('http://localhost:80/control')
        if req.status_code == 200:
            data = req.json()
            if data['cmd'] == 'on':
                relay.value(1)
            elif data['cmd'] == 'off':
                relay.value(0)

web_server()
```
How to use

1. Connect to the ESP8266's WiFi network using your computer or mobile device.
2. Send an HTTP GET request to `http://localhost:80/control?cmd=on` to turn on the relay, or `http://localhost:80/control?cmd=off` to turn off the relay.

### Example 2: Automatic LED Lighting Control using ESP8266 and DHT11 Sensor

This example demonstrates how to control an LED connected to the relay module using temperature and humidity data from a DHT11 sensor.

Hardware Requirements

5V ESP8266 WiFi Relay Module
 DHT11 temperature and humidity sensor
 LED
 Breadboard and jumper wires
 Power supply (5V, 10A)

Software Requirements

MicroPython firmware installed on the ESP8266
 DHT11 library for MicroPython

Code
```python
import machine
import dht
import time

# Initialize DHT11 sensor
d = dht.DHT11(machine.Pin(5))

# Initialize relay module
relay = machine.Pin(4, machine.Pin.OUT)

while True:
    # Read temperature and humidity data
    temp, hum = d.read()
    
    # Check if temperature is above 25C
    if temp > 25:
        # Turn on LED
        relay.value(1)
    else:
        # Turn off LED
        relay.value(0)
    
    # Wait 1 minute before taking another reading
    time.sleep(60)
```
How to use

1. Connect the DHT11 sensor to the ESP8266 as shown in the diagram.
2. Connect the LED to the relay module as shown in the diagram.
3. Power on the circuit and the ESP8266 will automatically control the LED based on the temperature reading.

These examples demonstrate the basic functionality of the 5V ESP8266 WiFi Relay Module. You can modify the code to fit your specific use cases and create more complex automation projects.