Arduino Forum

Using Arduino => Networking, Protocols, and Devices => Topic started by: fmartin on Nov 21, 2012, 05:11 pm

Title: Aduino MEGA 2560 + Eternet shield / SPI communication
Post by: fmartin on Nov 21, 2012, 05:11 pm
Dears,

I am using an arduino mega 2560 + ethernet shield. It is working fine from a network point of view. But I noticed that DIGITAL PIN 51 is always HIGH. Even if I write it low.
I read that such pin 51 is used for SPI communication. Does it explain the HIGH level on pin 51 ? Is there a workaround ?

Thanks for your answer.

Florent
Title: Re: Aduino MEGA 2560 + Eternet shield / SPI communication
Post by: SurferTim on Nov 21, 2012, 05:26 pm
You must leave pins 50-53 alone. Those are used by the SPI bus.