adc_temperature: Add support for linear interpolation of resistances

Add support for performing linear interpolation between a set of
measured temperature/resistance pairs.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 15 insertions, 7 deletions

diff --git a/config/example-extras.cfg b/config/example-extras.cfg
index 34f1c4e1..a4e52dde 100644
--- a/config/example-extras.cfg
+++ b/config/example-extras.cfg
@@ -1051,13 +1051,13 @@
 # sections with an "adc_temperature" prefix). This allows one to
 # define a custom temperature sensor that measures a voltage on an
 # Analog to Digital Converter (ADC) pin and uses linear interpolation
-# between a set of configured temperature/voltage measurements to
-# determine the temperature. The resulting sensor can be used as a
-# sensor_type in a heater section. (For example, if one defines a
-# "[adc_temperature my_sensor]" section then one may use a
-# "sensor_type: my_sensor" when defining a heater.) Be sure to place
-# the sensor section in the config file above its first use in a
-# heater section.
+# between a set of configured temperature/voltage (or
+# temperature/resistance) measurements to determine the
+# temperature. The resulting sensor can be used as a sensor_type in a
+# heater section. (For example, if one defines a "[adc_temperature
+# my_sensor]" section then one may use a "sensor_type: my_sensor" when
+# defining a heater.) Be sure to place the sensor section in the
+# config file above its first use in a heater section.
 #[adc_temperature my_sensor]
 #temperature1:
 #voltage1:
@@ -1067,6 +1067,14 @@
 #   A set of temperatures (in Celsius) and voltages (in Volts) to use
 #   as reference when converting a temperature. At least two
 #   measurements must be provided.
+#temperature1:
+#resistance1:
+#temperature2:
+#resistance2:
+#...
+#   Alternatively one may specify a set of temperatures (in Celsius)
+#   and resistance (in Ohms) to use as reference when converting a
+#   temperature. At least two measurements must be provided.
 
 
 # MAXxxxxx serial peripheral interface (SPI) temperature based