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тестовая связка:

mega + ethernet + сенсор света при заливке программы:

#include <Dhcp.h>
#include <Dns.h>
#include <Ethernet.h>
#include <EthernetClient.h>
#include <EthernetServer.h>
#include <EthernetUdp.h>

int ledPin = 13;// порт светодиода

void setup() {
  
  pinMode(ledPin, OUTPUT);
  
  // Установливаем аналоговый порт А0 на вход датчика
  pinMode (A8, INPUT);
  Serial.begin(9600);

}

void loop() {

int valLight = analogRead(A8) ;

Serial.println(valLight); // Выводим в порт данные

if (valLight<300) 
  digitalWrite(ledPin, HIGH);//если освещенность меньше 300, вкл диод
else
  digitalWrite(ledPin, LOW);//если освещенность меньше 300, вкл диод
  delay(500); 

}

если тоже самое и теже самые порты использую на Меге без Ethernet шилда, то все работает, но через Ethernet шилд, скетч не заливается(((

ошибка:

Arduino: 1.5.4 (Windows 7), Board: "Arduino Mega 2560 or Mega ADK"

Sketch uses 4 740 bytes (1%) of program storage space. Maximum is 258 048 bytes.

Global variables use 677 bytes (8%) of dynamic memory, leaving 7 515 bytes for local variables. Maximum is 8 192 bytes.

processing.app.SerialNotFoundException: Последовательный порт 'COM3' не найден. Вы выбрали нужный из меню Сервис > Последовательный порт?

	at processing.app.Serial.<init>(Serial.java:194)

	at processing.app.Serial.<init>(Serial.java:92)

	at processing.app.SerialMonitor.open(SerialMonitor.java:92)

	at processing.app.Editor.handleSerial(Editor.java:2521)

	at processing.app.Editor$17.actionPerformed(Editor.java:689)

	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)

	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)

	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)

	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)

	at javax.swing.AbstractButton.doClick(AbstractButton.java:357)

	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)

	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)

	at java.awt.Component.processMouseEvent(Component.java:6263)

	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)

	at java.awt.Component.processEvent(Component.java:6028)

	at java.awt.Container.processEvent(Container.java:2041)

	at java.awt.Component.dispatchEventImpl(Component.java:4630)

	at java.awt.Container.dispatchEventImpl(Container.java:2099)

	at java.awt.Component.dispatchEvent(Component.java:4460)

	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)

	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)

	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)

	at java.awt.Container.dispatchEventImpl(Container.java:2085)

	at java.awt.Component.dispatchEvent(Component.java:4460)

	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)

	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)

	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)

	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)

	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)

	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)

	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.