Chinese clones and issues W5100 - Githubissues

arduino-libraries / Ethernet

Ethernet Library for Arduino

http://arduino.cc/

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Chinese clones and issues W5100 #117

Closed Rotzbua closed 2 years ago

Rotzbua commented 5 years ago

Here a clear warning: There are some bugged clone ethernet shields on the market! In particular the cheep chinese 5$ W5100 boards have a bug which cause issues.

Observation

Ethernet not recognized by some routers
connection drops
long delays
hot components

Detection

A simple test to detect problems with soft- or hardware: ICMP (ping) to device.

Background: ICMP packages are replied by hardware automatically after the W5100 is initialized successfully.
Test: ping to device
Ping time = with spikes/ not constant ==> hardware problem
Ping time = constant ==> maybe no hardware problem

Solution

fix by soldering new components or bridges
buy original or from serious manufacturer e.g. seedstudio, dfrobot,...

Reference

Several boards with bug description and solution:

https://arduinodiy.wordpress.com/2017/04/12/the-w5100-bug/

Discussion on the arduino forum:

https://forum.arduino.cc/index.php?topic=351477.30

per1234 commented 2 years ago

Thanks for sharing this valuable information @Rotzbua. Since there is no action to take within this code base, I'll go ahead and close it, but it will continue to serve as a reference.