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steinhart_hart: Add Steinhart-Hart eq fns

- Port from thermostat firmware
This commit is contained in:
linuswck 2024-01-17 12:18:32 +08:00
parent cdf900a5b6
commit 3ac287ace2
2 changed files with 42 additions and 1 deletions

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@ -1,4 +1,5 @@
pub mod ad5680;
pub mod max1968;
pub mod thermostat;
pub mod ad7172;
pub mod ad7172;
pub mod steinhart_hart;

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use num_traits::float::Float;
use uom::si::{
f64::{
ElectricalResistance,
ThermodynamicTemperature,
},
electrical_resistance::ohm,
ratio::ratio,
thermodynamic_temperature::{degree_celsius, kelvin},
};
use miniconf::Miniconf;
/// Steinhart-Hart equation parameters
#[derive(Clone, Debug, PartialEq, Miniconf)]
pub struct Parameters {
/// Base temperature
pub t0: ThermodynamicTemperature,
/// Base resistance
pub r0: ElectricalResistance,
/// Beta
pub b: f64,
}
impl Parameters {
/// Perform the voltage to temperature conversion.
pub fn get_temperature(&self, r: ElectricalResistance) -> ThermodynamicTemperature {
let inv_temp = 1.0 / self.t0.get::<kelvin>() + (r / self.r0).get::<ratio>().ln() / self.b;
ThermodynamicTemperature::new::<kelvin>(1.0 / inv_temp)
}
}
impl Default for Parameters {
fn default() -> Self {
Parameters {
t0: ThermodynamicTemperature::new::<degree_celsius>(25.0),
r0: ElectricalResistance::new::<ohm>(10_000.0),
b: 3800.0,
}
}
}