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Questions tagged [ethernet]

Questions about the electrical implementation of Ethernet; ask another Stack Exchange for software or protocol questions. Specify the speed as 10/100BASE-T is somewhat different from 1000BASE-T, apart form the speed. Those are copper standards; Ethernet over fiber optical cable is also defined.

13
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4answers
7k views

Building a passive ethernet hub with anti-parallel diodes

I've found several guides online on how to build a passive ethernet hub, the design is always the same: I'm wondering what each of the 2 anti-parallel diodes do? For both positive and negative ...
1
vote
3answers
2k views

Is there another Arduino ethernet module besides the “Arduino Ethernet Shield”?

On the official Arduino website only the Arduino Ethernet Shield is referenced for Ethernet programming. Are there any other modules for Ethernet on the Arduino?
3
votes
3answers
966 views

Verifying Cat5e cabling

I have somewhat successfully installed Cat5e cabling in my home, which works flawlessly for 10 and 100 Mbit/s, but I am experiencing severe packets loss at Gigabit speeds, on all of the eight cables. ...
8
votes
1answer
1k views

DP83848 (Ethernet PHY) 1-bit serial receive data in 10Base-T

Having trouble getting a Texas Instruments DP83848J working in 10BASE-T mode. The link partner and local status register agree that the link is in 10Mbps full-duplex mode. However, instead of ...
2
votes
3answers
1k views

What is the most common way ethernet ports experience harware failure?

Modern electronics are incredibly reliable, however, I have had about 5 ethernet routers experience hardware failure on one or more ports on my home network. Is this unusual, and if it is, what ...
1
vote
4answers
2k views

Arduino +squidbee GSM shield + ethernet shield

I am triying to make a webserver of the ethernet shield to send SMS messages via the squidbee GSM shield Apparently i can't connect both the GSM shield and Ethernet Shield to the Arduino... Is this ...
2
votes
3answers
856 views

Wired AND Wireless Embedded Ethernet Project

Hey guys, I would like to design a device that is capable of connecting to a PC via WiFi or a wired connection (ideally Ethernet as well). I would like for it to be possible for a wired connection to ...
7
votes
1answer
5k views

TI MSP430 Launchpad + Ethernet

I just received my TI Launchpad and I'm wondering how can I add something like an Ethernet Shield from Arduino, in order to display a simple webpage... ? Do you know any Ethernet shield for Launchpad?
0
votes
1answer
7k views

Reading MODBUS RTU slave device Registers via RS485

i have a panel multimeter that i use for my whole house that has RS485, Modbus RTU comunication. I know what registers to read in order to get currents, voltages, power factor etc How can i use this ...
13
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3answers
14k views

Ethernet Layout Guidelines

I'm working on a DC jack powered Ethernet design and I've downloaded many Ethernet Layout guidelines from many semi vendors with varying recommendations. I've read app notes recommending almost every ...
6
votes
1answer
1k views

(Why) does this design suck?

I'm designing an Open Hardware door-lock-controller for our hackerspace, to these basic requirements: Be made exclusively from available and inexpensive parts. Read external Wiegand keyboard Read ...
2
votes
2answers
452 views

Sourcing for low power stepper motor driver assembly. Which is best cost and host software wise?

For small batch production I am looking for small low cost product. Need it to be network controlled (Ethernet TCP/IP) with open documentation. The current is about 1..2..3 Ampere, voltage 24..48V. ...
8
votes
4answers
1k views

What is needed to go from single Ethernet to many?

I have an embedded Linux system with a single Ethernet port, but I need to go to many ports. It is obvious I need to add magnetics and ports. The trickier parts follow. My processor has an on-board ...
1
vote
1answer
375 views

Microcontroller board with ethernet for computer sensors

I'm considering the possibility of using an ethernet-connected (SNMP would be a bonus) microcontroller board of some sort to monitor a RAID card inside a server that doesn't have OS support; the card ...
21
votes
3answers
936 views

Microcontroller with both ethernet and radio onboard?

Does anyone know of any (reasonably low-cost) SoC which combines all of: Microcontroller (any architecture, at least 4KB RAM/8KB flash) Radio transceiver (433MHz - 915MHz or 2.4GHz) Ethernet MAC + ...
3
votes
2answers
919 views

Hot ENC28J60 @ 132 mW

I have a problem with a relatively simple board which consists of an ENC28J60 Ethernet controller and an ATmega168. The circuit around the ENC28J60 is straight out of the datasheet and I have the ...
7
votes
2answers
396 views

Do I have to worry about the depletion of IPv4 addresses in embedded applications?

We're nearing the exhaustion of IPv4. What should be my concern about it for embedded devices? I don't know about others manufacturers but until today, Microchip TCP stack doesn't implement the IPV6.
8
votes
3answers
15k views

Connection of center tap for Ethernet transformer

I'm trying to connect an RJ-45 jack with integrated magnetics (Belfuse L829-1X1T-91 datasheet) to an Ethernet PHY chip (Micrel KSZ8041TL datasheet). The TX+/-, RX+/-, and the LED pins are all easy ...
6
votes
4answers
3k views

Embedded System that is able to connect to the internet

I am thinking about starting a project and was just looking for some general input. Where I work our company currently have remote stations that take data in from a radio link and input the data to a ...
8
votes
4answers
9k views

Wiznet W5100 vs. Microchip ENCx24J600

What are pros and cons using Wiznet W5100 or Microchip EncX24J600? It's a bit complicated to explain. My question is about the performance of Microchip TCP stack vs Wiznet TCP/IP core on the chip. ...
7
votes
3answers
2k views

hacking an AUI network port

Does anyone know what's entailed in connecting a computer that has only an 'AUI' network interface into a modern LAN? By AUI port, I'm referring to one of those 15-pin D connector arrangements that ...
4
votes
3answers
417 views

SBC Recommendations [closed]

I want to get started with embedded development and for my first project I thought of making a caller-ID type of appliance. Here's why I want a SBC for this: I want to be able to locally serve this ...
20
votes
8answers
13k views

Cheapest way to add wifi to a project [duplicate]

I need low power wifi for a not-very-data-intensive application. What modules or chipsets should I look at? Other than low cost and low power, I have no restrictions. The cheaper the better. This ...
4
votes
1answer
938 views

PIC18F97J60 Ethernet performance

Does anyone else use the PIC18F97J60 Ethernet capability? If so what kind of RX/TX performance is typical for that chip? I was running the TCPPerformanceRX/TX applications provided as part of the ...
7
votes
2answers
4k views

Best development board for ARM9? [closed]

I am looking for a cheap but powerful dev board for an ARM9 processor. It needs to be able to run linux. I am unsure about the exact specifications for RAM and such(thats partly why I'm posting this ...
5
votes
2answers
3k views

Making an Ethernet Shield work with an Arduino Mega

customer question: I have had no success with the ethernet & saw some fine print Please note that the current design of the ethernet shield is not compatible with the Arduino Mega http://...
5
votes
2answers
2k views

Disabling trailer protocol when using this W5100-based Ethernet shield

I have an Arduino Duemilanove (ATmega328) and Ethernet shield (based on the WizNet W5100). My network gateway is a D-Link DSL-G604T. Using this setup, I can contact computers on my local network fine....
47
votes
20answers
77k views

What is a good microcontroller for Ethernet applications?

What is a good microcontroller for doing Ethernet applications? Or do I just need a good Ethernet library to connect with an Ethernet MAC/PHY?
4
votes
3answers
965 views

Using a RealTek Ethernet Switch

I'm starting a project using the Realtek RTL8305SC ethernet switch. Does anybody have a good idea of how to use it, some code for it, or even a flow diagram of how it should be used in conjunction ...
4
votes
2answers
972 views

Arduino Twitter

How do you send a tweet via Arduino using an Arduino Ethernet Shield?