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Expose resistance property #19

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Merged
merged 1 commit into from
Jan 24, 2022
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Expose resistance property #19

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10 changes: 7 additions & 3 deletions adafruit_thermistor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -102,8 +102,8 @@ def __init__(
self.high_side = high_side

@property
def temperature(self):
"""The temperature of the thermistor in Celsius"""
def resistance(self):
"""The resistance of the thermistor in Ohms"""
if self.high_side:
# Thermistor connected from analog input to high logic level.
reading = self.pin.value / 64
Expand All @@ -112,8 +112,12 @@ def temperature(self):
else:
# Thermistor connected from analog input to ground.
reading = self.series_resistor / (65535.0 / self.pin.value - 1.0)
return reading

steinhart = reading / self.nominal_resistance # (R/Ro)
@property
def temperature(self):
"""The temperature of the thermistor in Celsius"""
steinhart = self.resistance / self.nominal_resistance # (R/Ro)
steinhart = math.log(steinhart) # ln(R/Ro)
steinhart /= self.b_coefficient # 1/B * ln(R/Ro)
steinhart += 1.0 / (self.nominal_temperature + 273.15) # + (1/To)
Expand Down