The Ethernet shield is an SPI device. It uses pins 11, 12, and 13 for SPI purposes. It uses pins 4 and 10 as slave select pins. None of those pins is available for your application to use.
The Ethernet shield is an SPI device. It uses pins 11, 12, and 13 for SPI purposes. It uses pins 4 and 10 as slave select pins. None of those pins is available for your application to use.