DS1822(3)

power

read-only,yes-no
Is the chip powered externally (=1) or from the parasitically from the data bus (=0)?

temperature

read-only, floating point
Measured temperature with 12 bit resolution.

temperature9 temperature10 temperature11 temperature12

read-only, floating point
Measured temperature at 9 to 12 bit resolution. There is a tradeoff of time versus accuracy in the temperature measurement.

latesttemp

read-only, floating point
Measured temperature at 9 to 12 bit resolution, depending on the resolution of the latest conversion on this chip. Reading this node will never trigger a temperature conversion. Intended for use in conjunction with /simultaneous/temperature.

fasttemp

read-only, floating point
Equivalent to temperature9

See the file man3/temperature_threshold.3so.

See the file man3/temperature_resolution.3so.

See the file man3/temperature_errata.3so.

DS1822

The DS1822 (3) is one of several available 1-wire temperature sensors. Alternatives are the DS18S20 (3), DS18B20 (3) as well as temperature/voltage measurements in the DS2436 (3) and DS2438 (3). For truly versatile temperature measurements, see the protean DS1921 (3) Thermachron (3).

Although the DS1822 (3) can select between 4 resolutions, this program simplifies the interface by only implementing the fastest/roughest and slowest/best.