Questions tagged [ethernet]

Ethernet can be used for cabled communication between an Arduino and a computer, server, or website. For question concerning the Arduino Ethernet board, use the tag "arduino-ethernet" instead.

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26 views

How to change the default SPI pin used in SPI and Ethernet library [duplicate]

Hello i have a custom board of the RP2040 and would like to use the ethernet library. But the ethernet example webClient uses the default SPI pins of whatever board it is being used, but what if im ...
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39 views

Arduino mega ethernet Udp client randomly failing

I have a keyestudio board identical to the arduino mega 2560. I use the matching keyestudio ks0156 W5100 ethernet shield. My code uses the following library for ethernet paulstoffregen/Ethernet@0.0.0-...
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40 views

UDP packet loss and very high ping time

Scenario I'm writing a code for Nucleo-144 F429ZI. It receives UDP packets (actually OSC bundles) and send back an answer when the command is completed. Issues It work fine most of the time. But there ...
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76 views

Bluetooth module with lowest latency to communicate with PC

I am making a haptic feedback glove using Arduino and HC-05 bluetooth module to communicate with PC. There are rotary encoders on the finger which send value to PC through Arduino mega. The PC returns ...
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1answer
81 views

Arduino Ethernet Shield: "no matching function for call to 'EthernetClass::begin()'" [closed]

So I sorta have no idea what is happening when it comes to http requests and DHCP. And I think that's part of what I'm doing wrong here. Every time try to compile this code, I get an error. I've ...
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1answer
77 views

Simple GET request is failing silently

I'm trying to make a simple GET request to a server (which has a static IP but does not have a name). I'm using EtherCard library and a cheap ENC28J60 Ethernet Module. The basic configurations are OK (...
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51 views

ARDUİNO MODBUS TCP CONNECTİON

I am trying to communicate with PC by using modbus TCP communicate. When I use this code I can't communicate. Dou you know guys what is the problem? My ethernet Module is working I know that because I ...
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106 views

Writing file from SD card to ethernet client stops sending after about 2980 characters, STM32f7 board

I am attempting to write a file found on an SD card to a connected Ethernet client. The file opens fine, and we have no problems writing to the client. For testing purposes I also write the lines read ...
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Arduino web server-how to get values form URL

I’ve already searched through the internet but cannot find satisfactory answer. Is there an easy way to get value of variable passed through an URL? What I mean is I want to start a web server on my ...
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1answer
135 views

communication between two arduinos using ENC28J60?

How can i connect and send data between two arduinos using a ENC28J60 ethernet adapters on both of them. Is there any guides or example codes for me to take a look from or any library which i can use ...
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1answer
31 views

Ethernet Shield not connecting

I've mounted an Ethernet Shield on top of an Arduino UNO. The Arduino is connected via usb to my pc and to the network via ethernet through a switch. I'm running a simplified verison of the WebServer ...
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1answer
269 views

How to make an arduino webserver over USB? without ethernet shield nor wifi chip

I would like to begin to understand ethernet handshakes by integrating an Ethernet over USB protocol within an arduino mega or nano. Is there something about the ethernet protocol that requires more ...
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1answer
57 views

SD seems too slow for SMTP

I have asked this question on the arduino forum as well. I have used SMTP before using client.print (and client.println) but I am now trying to move as much text as I can from RAM to SD (and so I need ...
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37 views

3 pin ethernet module?

So basically I'm working on a project that uses an Atmega328 like on the Arduino Uno. I need to receive both DMX (with max485) and E131 (Not both at the same time, I'll decide which with a boolean in ...
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1answer
40 views

Leading Zeroes on Arduino Ethernet MAC Address

How can I pass the MAC address to Ethernet shield with leading zeroes? I change the default MAC address from DEADBEEFFEED to something like DEADBEEFFE01. So I only change the last number from 0xED to ...
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147 views

Teensy 4.1 Ethernet Throughput

Using a socket server on a Teensy 4.1, I am sending and receiving data in a loop from a Windows socket client (WinForms C#.NET). I am sending or receiving 530 bytes of data. In each direction, it ...
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1answer
92 views

Modbus TCP together with MQTT over same ethernet

I'm currently in a planning phase for a project. I want to read some sensor data over Modbus TCP, do some simple calculations on the Arduino and publish the results over MQTT. Which means I have 2 RJ-...
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780 views

Modbus TCP/IP using Arduino uno and ENC28J60 module

I have this project where I need a modbus tcp server that will host a series of sensor data for other modbus client devices to read. I use this Library by Andresoarmento This is the code i am using ...
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34 views

Ethernet Shield doesn't work at all

I connected corresponding pins of Arduino Nano and the Ethernet Shield, connected my computer to a router (the light indicated the connection) and Ethernet Shield to the same router. Nevertheless, ...
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62 views

Arduino blocks when serving web pages

I have an Arduino sketch that serves an HTML web page using the standard Ethernet library (https://github.com/arduino-libraries/Ethernet) and the Ethernet Web Server library (https://github.com/khoih-...
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2answers
120 views

Arduino Yun receives UDP packets but prints them with gibberish

Arduino Yun is set to receive UDP packets. It receives those data with some gibberish. How is all set up: Arduino Yun (acts as a server) is connected through Ethernet to a PC which is (through WiFi) ...
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1answer
699 views

2 SPI devices conflict

I want to connect a W5500 ethernet Module and an SD card module to arduino Uno using SPI (with different CS pins of course). When connected separately they work fine but when connected in the same ...
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2answers
357 views

Ethernet Shield Not Working With TFT Screen

I'm trying to stack up Arduino UNO, Ethernet Shield and Waveshare 2.8" TFT Shield. Since I'm new to this I'm mostly doing basic stuff. I successfully manage to get ethernet shield and TFT shield to ...
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1answer
78 views

Arduino Ethernet shield frequently drops its IP address

Im working on a sketch that needs to display some internal variable values and analogue reads in a simple webpage. The only catch is that it needs to be as reliable as possible. Im getting some odd ...
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50 views

STM32Ethernet UDP misses some packets

Using STM32Duino on Nucleo F429ZI: #include <LwIP.h> #include <STM32Ethernet.h> #define UDP_TX_PACKET_MAX_SIZE 512 #include <EthernetUdp.h> IPAddress remoteIP; unsigned int ...
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1answer
804 views

HTTP parsing with authentication in Arduino + ethernet shield

i am trying to parse a page from the route by using Arduino + Ethernet shield. before Arduino testing. I tested my code via python as it shows below. from this code i can get the data as i wish where ...
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1answer
131 views

Ethernet shield connected to local network, not to internet

Using the WebServer example file I have been able to confirm that my arduino is connected to my local network and I can open the page in my browser. However any attempt at contacting addresses outside ...
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2answers
1k views

When connecting, client.connect() returns 0

I'm using an arduino UNO with ethernet shield. When following a few guides online for a school project I came across this issue. First code sample: #include <SPI.h> #include <...
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1answer
1k views

Is there an Arduino library that uses ARP to get list of connected devices on network?

I have been looking for a library that can execute an ARP (Address Resolution Protocol) command to return a list of connected devices on the network. The idea is that it would send the request to the ...
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1answer
107 views

Refreshing a web-page hangs after few times

I'm using a Nucleo F429ZI board and I wrote a sketch that enables a simple web-server: #include <LwIP.h> #include <STM32Ethernet.h> const int WEB_PORT = 80; EthernetServer server(...
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1answer
85 views

EthernetClient not initializing properly

I am trying to make a connection with the EthernetClient, but it always fails with code 0. I decided to write a small code just to test if the client ever becomes ready, and as I suspected it does not....
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1answer
677 views

MQTT on nano with Ethernet shield not working

I'm using an arduino nano with an ethernet shield (ENC28J60), and ethernet eem to be working (I can create a webserver with Ethercard library).However, i'm stuck when i try to connect to a MQTT ...
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1answer
35 views

command keeps echoing because web page tries refreshing

I want to execute a action only once when I press web page button but as the page tries refreshing the action gets executed in a loop. I am using the wifimanualwebserver example for esp8266. Please ...
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101 views

Ethernet.h Ethernet.Begin(mac) only connects if i have a LiquidCrystal object from LiquidCrystal.H

I have the following code; #include <Ethernet.h> #include <SPI.h> #include <LiquidCrystal.h> LiquidCrystal lcd(31, 30, 29, 28, 27, 26, 25, 24, 23, 22); byte mac[] = { 0xDE, 0xAD, ...
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170 views

Arduino Mega failing to connect to XAMPP database/php server to send HTTP requests

I have developed an application with a SunFounder Mega2560 with a W5100 Ethernet shield that acts as a server and successfully parses TCP message packets from a client sending in updates. I am now ...
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32 views

Remote Arduinos polling a master Ardrino over ethernet/wifi

I'm setting up a "Panic Button" for our Front Office. The concept is to have a master Arduino with the button and 4 other Arduinos with Strobes and/or alarms to alert the rest of the staff. The bells ...
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1answer
269 views

Arduino HTTP Request Fails Slow Cellular Connection

Setup: Arduino Mega 2560 w/ Wiznet W5500 Ethernet Sheild Using TP-Link TL-MR6400 LTE router to connect to internet over cellular connection in Uganda. Using an HTTP Post with the following, ...
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1k views

Ethernet Shield Issue

I just bought a Ethernet Shield for my Arduino UNO. I connected it to my arduino and flashed the Example code for Ethernet Shield, but the code didn't work. The COLL LED on ethernet shield is glowing ...
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1answer
209 views

one Arduino with RS485 and Ethernet shields: does this work?

I'm planning to wire a few Arduinos together via RS485, and have one of them act as a hub that collects information from the others and presents it via http on an Ethernet connection. For instance ...
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1answer
619 views

Public IP for Arduino with Ethernet shield and Arduino Uno

I'm new Arduino and I would like you to help me. I would like to have a public IP so that anyone can get access to it, not only from domestic domain. What could I do?. I'm using Arduino Uno, Arduino ...
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1answer
36 views

My webswerver works fine when there is only 1 servo used/defined in my code

I am trying to make a webserver which controls my 3 servos for a robotic arm. When I define and use 1 servo it is nice and quick, but whereas if I use more than 1 the webserver is very slow and barely ...
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1k views

How to create a Arduino socket server to receive messages

From linux I can send a socket message using netcat echo "Hello" | nc 88.109.110.161 100 But I don't know how to setup the socket server for listening incoming messages using the ethernet shield. ...
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224 views

UDP behavior different for STM32

I'm facing a weird situation, where the UDP behavior seems different in STM32 porting (stm32duino). Short question Besides port and address, what are the other parameters that characterize the UDP ...
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99 views

Arduino with Ethernet Shield with PC to upload data to Microsoft Azure

i am a student doing a project related to datalogging. My project is a rehabilitation device that uses 2 rotary encoders to record data for rotation and linear movement of a human arm. The data ...
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436 views

Can't parse large json file

For a project I've to parse a big json file. Unfortunately it does not work as expected. Here is the json file: { "data1": "...
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1answer
256 views

Limitations of connecting to many Arduinos via Ethernet?

I'm planning a project where I need to control a lot of Arduino Unos from a single PC. I'll need to send commands to the Arduinos and receive responses, as well as have the ability to update each ...
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1answer
340 views

Mini ethernet shield pins don't have SI

Please somebody who had the same issue help me. The question is how to connect this Mini Ethernet shield to an Arduino. The main problem is the pins that my shield have or haven't; my current ...
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1answer
720 views

Send files via network [duplicate]

I want to send a file from an Arduino to the server or another Arduino. I wrote a code that's open the file then write the content of the text on an array and then send it. That would work if the ...
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0answers
124 views

Sending .wav via network

I'm working in a project and part of this project is sending a .wav file from an Arduino to other device (for example anther Arduino). I already am able to send a .txt file from an SD which was ...
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46 views

WebClient Not Working On Shared Network

I'm working on a school project, and I use Arduino Uno to collect some data with sensors, and then send it to an online database. The Arduino is connected to the Internet via an Ethernet Shield and an ...

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