Para ler as temperaturas e tensões, há também a API do Linux hwmon , que tem um sysfs interface :
$ ls -l /sys/class/hwmon/
total 0
lrwxrwxrwx 1 root root 0 Jun 30 00:05 hwmon0 -> ../../devices/virtual/hwmon/hwmon0
lrwxrwxrwx 1 root root 0 Jun 30 00:05 hwmon1 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/hwmon/hwmon1
lrwxrwxrwx 1 root root 0 Jun 30 00:05 hwmon2 -> ../../devices/platform/coretemp.0/hwmon/hwmon2
lrwxrwxrwx 1 root root 0 Jun 30 00:05 hwmon3 -> ../../devices/platform/nct6775.2560/hwmon/hwmon3
$ cat /sys/class/hwmon/hwmon2/temp1_input
43000
AFAIK sensors
usa essa interface (talvez entre outras).