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# Convert resistance (0–50kΩ) to temperature in °C def res_to_celsius(resistance): # Ensure valid input range if resistance <= 0: resistance = 1e-6 # Avoid log(0) elif resistance > POT_RESISTANCE: resistance = POT_RESISTANCE # Beta equation: T = 1 / (1/T0 + (1/B) * ln(R/R0)) - 273.15 steinhart = math.log(resistance / THERMISTOR_NOMINAL) steinhart /= B_COEFFICIENT_OUTPUT steinhart += 1.0 / (TEMPERATURE_NOMINAL + 273.15) steinhart = 1.0 / steinhart celsius = steinhart - 273.15 # Clamp to physical range (-7.22°C to 100°C) return Tclamp(celsius, Tminn, Tmaxn)
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