forked from M-Labs/thermostat
41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
use num_traits::float::Float;
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use uom::si::{
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f64::{
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ElectricalResistance,
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ThermodynamicTemperature,
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},
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electrical_resistance::ohm,
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ratio::ratio,
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thermodynamic_temperature::{degree_celsius, kelvin},
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};
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use serde::{Deserialize, Serialize};
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/// B-Parameter equation parameters
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#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
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pub struct Parameters {
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/// Base temperature
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pub t0: ThermodynamicTemperature,
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/// Thermistor resistance at base temperature
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pub r0: ElectricalResistance,
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/// B, the average slope of the function ln R vs. 1/T
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pub b: ThermodynamicTemperature,
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}
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impl Parameters {
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/// Perform the voltage to temperature conversion.
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pub fn get_temperature(&self, r: ElectricalResistance) -> ThermodynamicTemperature {
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let inv_temp = 1.0 / self.t0.get::<kelvin>() + (r / self.r0).get::<ratio>().ln() / self.b;
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ThermodynamicTemperature::new::<kelvin>(1.0 / inv_temp)
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}
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}
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impl Default for Parameters {
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fn default() -> Self {
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Parameters {
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t0: ThermodynamicTemperature::new::<degree_celsius>(25.0),
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r0: ElectricalResistance::new::<ohm>(10_000.0),
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b: 3800.0,
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}
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}
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}
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