View source for Talk:Chest Freezer To Refrigerator Conversion

=math=

What temperature should a refrigerator be?

The FDA recommends between 32°F and 40°F (0°C to 4°C).

Energy Star recommends between 35°F and 38°F (2°C to 3°C) to reduce energy use.


thermister = 

:10K Ohm @ 25 celcius
:20.13 @ 5
:24.30 @ 0

==voltage devider==

Vout = (R2/(R1+R2)) x Vin

:24.3 Ohm -> 0.962V
:24 Ohm -> 0.97V
:21 Ohm -> 1.06V

==Analog to Digital Converter==

Arduino's onboard ADC converts voltage to a range of 0-1023 based on arduino's base voltage

so on a 3.3V arduino, analogRead(A1) will equal
 
:0V = 0 reading
:1.65 = 511
:3.3V = 1023

so

:24.3 Ohm = 298.25 = 0 C
:24 Ohm = 300.88
:21 Ohm = 329.99