Mechanical temperature sensors

Electrical temperature sensors

Integrated circuit sensors

The integrated circuit sensor may come in a variety of interfaces — analogue or digital; for digital, these could be Serial Peripheral Interface, SMBus/I2C or 1-Wire. In OpenBSD, many of the I2C temperature sensors from the below list have been supported and are accessible through the generalised hardware sensors framework since OpenBSD 3.9 (2006), which has also included an ad-hoc method of automatically scanning the I2C bus by default during system boot since 2006 as well. In NetBSD, many of these I2C sensors are also supported and are accessible through the envsys framework, although none are enabled by default outside of Open Firmware architectures like, and a manual configuration is required before first use on or. Remote uncooled IR thermal radiometer sensors are also commonly used in integrated circuits.