STM32 Ethernet network connection using module W5500.

About

Application to control led lights, display temperature and humidity by DHT22, gas leak alarm by MQ2 through a web interface STM32 Blue Pill connected to Wiznet W5500 to connect, send data, and control signals from the web down to devices and sensors.

Components Required

• STM32F103C8T6
• Wiznet W5500
• DHT22
• MQ2
• LED

Circuit Diagram and connections

STM32	Device
PA4	MOSI (W5500)
PA5	MISO (W5500)
PA6	SCLK (W5500)
PA7	SCS (W5500)
PA8	SIREN
PA0	OUT (MQ2)
PC13	LED
PB9	DATA (DHT22)

Working & Code Explanation

Use ST-Link V2 to upload the code to STM32

G   -- GND
CLK -- SWCLK
IO  -- SWDIO
V3  -- 3.3V

Library

Ethernet.h
SPI.h
DHT.h
ioLibrary_Driver

Configuration

MAC, IP, Mask, Gateway, and Remote Server IP

Edit in main.cpp

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};  // physical mac address
byte ip[] = {192, 168, 0, 200};                     // ip in LAN (that's what you need to use in your browser. ("192.168.1.178")
byte gateway[] = {192, 168, 0, 1};                  // internet access via router
byte subnet[] = {255, 255, 255, 0};                 // subnet mask
EthernetServer server(80);                          // server port

Compile

Using PlatformIO to build

platformio.exe run

To fix the web interface

main.html

Test

Connect Ethernet to the W5500 and type your IP address into the browser.

192.168.0.200

Reference

• Official Library: https://github.com/Wiznet/ioLibrary_Driver
• Home page: https://www.wiznet.io/product-item/w5500/
• Official WIKI: http://ww7.wizwiki.net/wiki/doku.php/products:w5500:driver