Somebody suggested using this schematic
and amplifying it by 4 times using
It seems like it works as expected, at least the voltages read. The issue I'm facing right now is actually reading the correct temperatures. For a 1000 ohm resistor I got 1.80 V and for 1758 ohm (resistance at 200C) I got 2.98 V.
My logic is T = (((voltage * 100) / vt_factor) + offset). Where the vt_factor is 2.98V-1.80V and the offset is currently 0. Doing this it gets me T=152.8C at 1000ohm and T=252.8C at 1758ohm.
I have expected the temperature at 1758 ohm to be 352.8C, is it something I'm missing?