forked from M-Labs/thermostat
atse
069d791802
The Steinhart-Hart equation was changed in code long ago to the B-parameter equation. Rename references to it and the interface accordingly. The `s-h` command is now `b-p`. The reason the name "B-Parameter" equation was chosen over "Beta-Parameter" was due to its easier searchability.
39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
use num_traits::float::Float;
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use serde::{Deserialize, Serialize};
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use uom::si::{
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electrical_resistance::ohm,
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f64::{ElectricalResistance, TemperatureInterval, ThermodynamicTemperature},
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ratio::ratio,
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temperature_interval::kelvin as kelvin_interval,
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thermodynamic_temperature::{degree_celsius, kelvin},
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};
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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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/// Beta (average slope of the function ln R vs. 1/T)
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pub b: TemperatureInterval,
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}
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impl Parameters {
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/// Perform the resistance to temperature conversion.
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pub fn get_temperature(&self, r: ElectricalResistance) -> ThermodynamicTemperature {
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let temp = (self.t0.recip() + (r / self.r0).get::<ratio>().ln() / self.b).recip();
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ThermodynamicTemperature::new::<kelvin>(temp.get::<kelvin_interval>())
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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: TemperatureInterval::new::<kelvin_interval>(3800.0),
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}
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}
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}
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