Fix for below 0C measurements with nominal resistance other than 100 ohms
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@ -244,6 +244,11 @@ class MAX31865:
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temp = (math.sqrt(temp) + Z1) / Z4
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if temp >= 0:
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return temp
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# For the following math to work, nominal RTD resistance must be normalized to 100 ohms
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raw_reading /= self.rtd_nominal
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raw_reading *= 100
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rpoly = raw_reading
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temp = -242.02
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temp += 2.2228 * rpoly
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