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void analogReference (uint8_t type)

Configure the reference voltage

Configure the reference voltage of the mode pin. 函数 analogRead, after reading the analog value, will transform it to one during [0,1023], according to the reference voltage. There are the following types:

DEFAULT : 5V by default. INTERNAL: low consumption mode. ATmega168 and ATmega8 is corresponding to 1.1V to 2.56V. EXTERNAL: Expansion mode. Get reference voltage through AREF pin.

  • Parameters:

type reference type(DEFAULT/INTERNAL/EXTERNAL)

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