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The ethernet shield connects to an Arduino board using long wire-wrap headers which extend through the shield. This keeps the pin layout intact and allows another shield to be stacked on top. The latest revision of the shield adds a micro-SD card slot, which can be used to store files for serving over the network.

1 vote

Http request change delay

Inside delay() no other code can run. Which also means that no clients can be serviced. Change that delay-laden function to a state machine mirroring blinkWithoutDelay. That is you test if(millis() …
ratchet freak's user avatar
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Help adding 3 more on/off switches so that I can control 4 LEDs

The html you send must be changes to add the buttons: client.print("<body> <a href='/?Led1=1'>Button1On </a> <a href='/?Led1=0'>Button1off </a>"); client.print("<a href='/?Led2=1'>Button2On </a> <a h …
ratchet freak's user avatar
2 votes

if two arduinos are connected by I2C and one of them is using an ethernet shield, does that ...

It can but only if the one with the shield allows it (it acts like a router). The only way for the arduino without the shield can communicate with the internet if it can send a message to the one wit …
ratchet freak's user avatar