Duvida iniciante. Sobre shields

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pessoal, estou começando mexer e estudar sobre arduino agora.
comprei um arduino mega 2560 r3 pra automatizar o acendimento de algumas lampadas em casa. para fazer isso comprei uma shield ethernet w5100 e uma outra shield relay 4 channel. ate aqui esta tranquilo. minha duvida esta no seguinte, caso eu queira colocar mais uma shield ex: infra vermelho, para controlar o ar condicionado. eu posso?

obrigado
andré luis

depende dos pinos que cada shield usa.


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