How to read CPU temperature into Arduino? I'm not sure about this and if it is possible. I need to read CPU (normal computer) into an Arduino. This could be possible (at least I think) by connecting some kind of sensor that can be placed between the heatsink and the CPU, where the thermal paste is placed. Or, the second option is to read values from the system somehow, or from the motherboard. I hope I'm not talking about stupid things. I need some advice about this.
Here is a simple way to send CPU temperature reading data via serial port, under Windows.

As answered in the question Batch-file get CPU temperature in °C and set as variable, it is possible to build batch file (*.BAT) to get the readings and output to console. I took following option and built the BAT file.

wmic /namespace:\\root\wmi PATH MSAcpi_ThermalZoneTemperature get CurrentTemperature


Now, to redirect the console to serial port, use &gt; symbol. Try following and receive it in your Arduino or use serial port monitor to check (in my case it works):

mybatfile.bat &gt; COM1


Alternatively, you can use

wmic /namespace:\\root\wmi PATH MSAcpi_ThermalZoneTemperature get CurrentTemperature &gt; COM1


inside your BAT file.

Next, we have to specify the serial configuration, make it EXE file so it can run under Administrative account. I used Advanced BAT to EXE converter. In the tool, specify the commands:

@echo off
mode COM1 BAUD=38400 PARITY=n DATA=8
wmic /namespace:\\root\wmi PATH MSAcpi_ThermalZoneTemperature get CurrentTemperature &gt; COM1


Convert it to EXE using File->Build EXE...



And finally, you can create Scheduled Task to run your newly built EXE application periodically.

BTW, WMI is a powerful interface, it is possible to retrieve many other metrics and configuration data.