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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132 views

Directly connect Arduino to Macbook over Ethernet

I am trying to connect my Arduino to my MacBook over ethernet via a thunderbolt-ethernet dongle. However, I am unable to access my Arduino over Ethernet. The problem is very similar to one mentioned ...
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237 views

if two arduinos are connected by I2C and one of them is using an ethernet shield, does that grant both of them access to the internet?

i have two arduino mega and they send data to each other by an I2C connection. But one of those arduinos is connected to an ethernet shield which allows it to send data to a web server. Being both ...
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Sending data from webserver to Arduino

Hello Arduino enthusiasts! I've been working on a keypad lock system for school lately and I need some advice.Basically, my code checks if the entered passcode is the same than a predefined passcode ...
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33 views

Using USB or ethernet to carry digital signals

I need to send six digital signals about 4 feet through wires. An ethernet cable has 8 little wires that should do the trick. I could split the ends and solder them to my boards. Is there an adaptor ...
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1answer
104 views

Uno R3 connected via Ethernet shield becomes unreachable after a few minutes

I'm setting up an Elegoo Uno R3 with a Seeed 5200 ethernet shield to monitor water flow and temperature. It needs to run unattended for weeks at time (being called several times a day by a remote ...
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169 views

Cannot connect to database Ethernet Shield

I am using an LDR sensor to store its readings into the database. My code is as follows: #include <SPI.h> #include <Ethernet.h> const int ledPin = 13; //the number of the LED pin ...
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1answer
253 views

Peer to Peer using Ethernet Module

I'm beginner here at arduino stuff. i just started learning arduino and i have this small homework where i NEEDED to connect 2 arduino using ethernet shield or module ONLY over a distance of 20 meters....
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2answers
638 views

Is the arduino hackable when using communication shields?

Let's say I have an arduino Uno connected to a W5100 ethernet shield. The arduino communicates with the ethernet shield using the tx0 and rx0 pins. When I upload a new script to the arduino using USB, ...
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1answer
75 views

Ethernet connection - how to send data from interrupt

I have question similar to old topic here Any way to pass EthernetClient to function outside of loop automatically? I have in the main loop opening of the TCP server which is just maintaining the ...
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1answer
494 views

Preventing relay switch-off crashing Ethernet controller

I have an Arduino Uno with Ethernet Shield controlling some relays. Initially everything works fine but then when switching the relay off, the Ethernet controller frequently 'crashes'. Ethernet stops ...
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2k views

get request with ENC28J60 Ethernet module

I try to make a simple http get request from Arduino uno to my website (shared hosting) where i fetch the data to db. I use the EtherCard library and ENC28J60 Ethernet module. Here is the code: #...
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1answer
290 views

http request in time intervals

I'm doing a program that receives data from a web page every so often, but only receives the data once and then receives everything blank. I need help to receive the data every time indefinitely. I am ...
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1answer
652 views

How to connect an Arduino via an ethernet cable to a laptop directly?

Maybe a silly question, because it is a usual topic, but I have a problem with my Arduino Leonardo ETH. I want to create a web server on the Arduino with the example sketch File > Examples > ...
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1answer
4k views

Arduino Nano + RC522 + w5500 Ethernet Module

has anyone had any experience wiring up an arduino nano with an RC522 RFID module and a W5500 ethernet module? i can get each of them to work individually, but i cannot get them to work together. i am ...
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2answers
645 views

How to get a character from a serial Parsed http response? [closed]

I am a web developer and I am struggling with C code on Arduino. So this is What I have: I have a backend written on PHP that returns a 0 or 1 depending of wether a pin should be high or low. I have ...
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1answer
1k views

Send HTTP request from Arduino Ethernet to server on PC

I am simply trying to send a simple HTTP request from an Arduino Uno with w5500 Ethernet Shield to a local server running on my PC. The two are connected via a crossover ethernet cable and I am able ...
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4answers
3k views

Arduino Micro + W5500 module from AliExpress

Got this module from Aliexpress W5500 Ethernet Network Modules For Arduino TCP/IP 51/STM32 SPI Interface 3.3V 5V I/O MCU ... and trying to hook this up to my proto Aduino Micro as thus: Micro -> ...
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1answer
510 views

Grounding issues Arduino Ethernet Shield makes WS2811 LEDs flicker

I have an Arduino Due with an Arduino Ethernet Shield V2 that I use to control multiple daisy-chained WS2811 LED strips. When I turn on most of the LEDs the Arduino and attached wires seem to become ...
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1answer
589 views

Arduino connection with the server failed

I am trying to connect arduino uno and ethernet shield and try to send some data to an asp.net web api application. When i upload the sketch, i get in the serial monitor connection failed. I don't ...
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1answer
430 views

Transfer byte-buffer with ENC28J60

How do I transfer a series of byte[256]-buffers to a server with an ENC28J60 Ethernet adapter? I get blocks of uint8_t from an Arducam camera module and I'd like to transfer them to a host. Does ...
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1answer
426 views

RFID does not respond after Ethernet.begin(mac, ip) initialization

Good day, I have this problem with my simple project. I have a database with all RFID number of employee. What I want to do is to use an rfID to check if it is registered in the database. If it is, it ...
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3answers
823 views

Multiple SPI device

I want to connect Ethernet board (W5100 HR911105A) to Arduino Leonardo with SPI and I also want to connect SD reader. When I test these boards separately everything working. But when I connect them ...
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0answers
205 views

LED Webserver control not working

I've got an Arduino Uno and Ethernet shield, trying to test it out with a simple on off switch for the on-board LED. My Code is this // FILENAME = LED2.ino // SOURCE= http://www.instructables.com/id/...
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2answers
716 views

Arduino Ethernet Shield 2: How can I automatically determine the MAC Address?

I'm using an Arduino Mega. I know that Ethernet Shield 2's come with a sticker with the MAC Address printed on it. This would imply to me that this address is hardcoded into the shield. Is there any ...
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1answer
2k views

is there a timeout for Ethernet.begin?

I'm working on a project, but just for testing, I haven't connected it to the internet yet, even though the code SHOULD be ready to roll out. When trying to test some of my code with the serial ...
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1answer
65 views

Lifespan of a hot microchip [closed]

I'm currently building my own Home Automation System with a bunch of Arduinos and Relais, all of them wired to Ethernet "Shields". The casing I am printing on a 3D printer. The Arduinos work great ...
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2answers
5k views

Compilation Error: “cannot declare 'client' to be of abstract type 'Client'”

I know, it isn't my original code, but I'm using this for a larger project that I am currently working on. I keep getting this error message: "cannot declare 'client' to be of abstract type 'Client'". ...
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1answer
4k views

My Arduino Ethernet shield is not working

Actually I'm using a W5100 Hanrun HR911105A 16/02 Ethernet shield with an Arduino Uno (original). I tried this code from the examples: #include <SPI.h> #include <Ethernet.h> // Enter a ...
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1answer
1k views

How to read response from server using an Ethernet shield?

I want to control a relay by reading values from MySQL. I'm using an Arduino and an Ethernet shield. So far, I can get the response from server and get the value. I just need the value 10110110, but I ...
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1answer
621 views

Arduino Ethernet shield cannot establish connection

I bought a Chipdot Ethernet shield from Amazon. It does not have any MAC address on it. I connected this shield to an Arduino Uno. I tried to run the DHCPAdressPrinter code from Ethernet library on it,...
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2answers
3k views

Is Arduino Ethernet shield compatible with arduino due?

Arduino Due's operating voltage is 3.3 volt and Ethernet shield operates on 5 volt supply. So my question is that this Ethernet shield will work on an Arduino Due and also if it will not harm the ...
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2answers
3k views

PHP/My SQL Database -> to Arduino Serial Monitor

I'm using this domain http://www.decathlon.commonarchitecture.ca/ to host my phpmyadmin database and php code. I would like to read a specific column of the database in the serial monitor, displaying ...
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2answers
1k views

Get image from Arduino Ethernet Shield sd card

I have a code that uploads the temperature and humidity from a dht22 to a website. Now i want to add an image to the "add to homescreen" button in safari on ios. Apple has a html code for this: &...
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1answer
667 views

Ethercard. Copying ip address into hisip

I've tried getting help from arduino.cc forum but they arent helping at all (more like being cryptic) i'm kinda a newb at this. And i'm seriously not getting help from there. 2 messages in 8 days from ...
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1answer
613 views

Uno with LCD acting strangely - power issue?

I've got a Uno (Elegoo UNO R3) running with - Ethernet shield (Kuman K15), - 4 relay board (Elegoo 4 Channel DC 5V Relay Module with Optocoupler ) - Matrix Orbital 2041 LCD connected via I2C (11mA ...
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0answers
419 views

SPI communication between two Ethernet Shields (W5100)

I am a newbie to the world of IoT, I want to ask... Is it possible to connect two Ethernet shields with SPI? And if yes, how can I codes them? I have reference from http://www.gammon.com.au/spi and ...
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2answers
2k views

How to connect arduino with local network

I am trying to connect Arduino with local network. This will act as a web server, client would be android mobile app or web browser. These are on same local network. Do I need Ethernet Shield or ...
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0answers
1k views

Connect to Ethernet2 by hostname

I´d like to connect my Ethernet2 with WIZ550 using DHCP but instead of Local IP, I want to use Hostname. This is my code, it works. I get a Local IP Address and I can connect to Arduino using this IP,...
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1answer
722 views

what pins are attached to ethernet shield SD card?

I have ARDUINO ETH SHIELD 06 - Rev 03. https://www.adafruit.com/product/201 what pins are attached to Ethernet shield SD card?
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1answer
369 views

Why my Galileo isn't getting a IP address?

I have an Ethernet cable connected to my router. I connected the other end to my laptop and got a successful connection. When I plug it into my Arduino Galileo gen2, even with Ethernet port green ...
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1answer
142 views

POE with Arduino Leonardo Eth

I recently purchased a Leonardo Eth and a 5v POE module in an attempt to have a POE micro-controller. I installed the module in the holes closest to the Ethernet jack side of the board, but when I ...
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1answer
58 views

help connecting atmega32 micro-controller to LAN [closed]

I have an atmega32 micro-controller and I would like to connect it to my LAN via ethernet, I'm planing to do this using arduino ethernet shield W5100 but I don't know how to start or how to interface ...
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2answers
1k views

Connect Arduino Uno to video camera's web Server via Ethernet (not working)

I work with cameras in the film and TV industry. A project I have just started tinkering around with is building an Arduino Uno-based box that would automatically collect the metadata (settings, etc.) ...
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1answer
974 views

Ethernet Shield - Multiple simultaneous connections cause TCP reset

I have a very inconvenient problem with a web server I'm writing for a Arduino Mega 2560 with a W5100 Ethernet Shield (with the "official" Ethernet lib). I wrote the server code and it works like a ...
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1answer
221 views

Arduino for push notifications to phone

I'm interested in using an Arduino for a project for taking information and sending it through a phone application. I was wondering what the cheapest option there is for an arduino with internet ...
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0answers
553 views

Reading values from Wiznet w5500 chip over SPI

I am trying to get the MAC address that is stored on the Wiznet w5500 chip. On page 29 - click here, it has the address of the values. It state that "This block can be selected by the BSB[4:0] value ...
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2answers
438 views

Connect my Arduinos to central server, despite different IP adresses

Community, A team of friends just built, with an Arduino UNO, a system where one can open a door lock from the internet. The Arduino UNO has an Ethernet Module (ENC28J60). When the command prompts, ...
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1answer
734 views

Arduino Uno Wunderground weather station - Ethernet connection failed

I'm new to Arduino. For my first project, I've decided to build a weather station where data is collected via sensors and is then sent to Wunderground. I'm using an arduino uno, an ethernet shield as ...
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0answers
778 views

Minimal ATmega328p Ethernet Configuration

What would be minimal schematic for ATMega328P in order to have communication over ethernet? So I'm not asking about attaching existing shields to existing Arduino board, but just for bare minimum of ...
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1answer
780 views

Arduino connection websocket always fails

I am using the Arduino Websocket Client library to connect my Arduino Uno to a Socket.IO server. But the connection always returns 0 (fail) after the handshake. Anyone has used this library before? ...