Hi Melanie,

I'm not that good with electronics and have asked someone else if it would work if I use a signal Diode such as 1N4148?
This is what he Said:
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No it wouldn't work, because the MAX1672 digital inputs need 0.4V VIL(max), and your signal diode would make the pin over 0.8V.
Even if you use a Schottly diode like the panasonic MA793 or a germanium diode (0.2V to 0.3V) this would still make the VIL too high, and would leave a very narrow noise margin. At cold temperatures the circuit might not turn ON.

The (2) 2K resistors make a VIL of less than 70mV, guaranteeing the turn ON. And the PIC has no sweat driving the resistors loads.
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Is he correct with his comments?