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theskett : internal   8

Mailbox notifier project upgrade | LowPowerLab
The 10k pull-up resistor for the hall effect sensor may not be needed. I used the 20k internal pull-up of the ATmega on the Moteino and it worked fine. Here’s how to enable the internal pull up:

pinMode(4, INPUT); // set pin 4 to input
digitalWrite(4, HIGH); // turn on pull-up resistor

More info here –
arduino  voltage  meter  battery  test  internal  pull  up  resistor 
january 2017 by theskett

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