... PulseIn may be unreliable for such low voltages (500mV square waves won't be detected by the Arduino's internal Schmitt trigger).
[...] read the digital PWM signal(~500mV square wave) [...]
I thought these fans had a logic level (3.3 or 5 V) signal to them?? Or is this on the motherboard??
... You can get the LM35 in a TO-46 metal case for good coupling to your heatsink. ...
Quote from: justjed on Apr 28, 2011, 02:21 am... You can get the LM35 in a TO-46 metal case for good coupling to your heatsink. ...I don't believe that this is a viable option as the LM35 has a minimum operating temperature of -40C. What happens if the temperature drops below -40? Does it continue to read -40, or does it create an error message somehow?
... that is currently controlling the fan mounted to the CPU heat sink.