I am working on a entertainment cabinet fan. The idea is to use a DROK 10k thermistor and a 10k resistor as a voltage divider connected to AO. The project will be connected to 12v DC and vary the speed of fans according to the internal temperature, with a 16x2 display for feedback. On USB power, the display works and shows relatively accurate temperatures. The Arduino is supposed to be fed by a daughter board with the transistors, voltage divider and a 12v to 5v DC to DC converter. The voltage divider draws 5v from the output of the DC to DC converter, tied directly to the wire going to the Arduino's VCC. When plugged into the wall, the display shows a high temperature that actually decreases the reading when warming the sensor. I'm pretty sure it's something stupid I missed. Any ideas?
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