- Modified some thermocouple functions to use f64 instead of f32

- Added thermistor
- Added resistive divider

src/transducer/part/thermistor.rs

@@ -0,0 +1,33 @@
+use libm::{log, logf};
+use uom::si::electrical_resistance::ohm;
+use uom::si::quantities::{ThermodynamicTemperature, ElectricalResistance};
+use uom::si::thermodynamic_temperature::kelvin;
+
+/// Convert thermistor resistance to a temperature using beta parameter equation
+pub fn convert_beta(
+    resistance: ElectricalResistance<f32>,
+    beta: f32,
+    reference_temp: ThermodynamicTemperature<f32>,
+    reference_resist: ElectricalResistance<f32>,
+) -> ThermodynamicTemperature<f32> {
+    let ohms = resistance.get::<ohm>();
+    let reference_kelvin = reference_temp.get::<kelvin>();
+    let reference_ohms = reference_resist.get::<ohm>();
+
+    let result_kelvin = 1.0 / ((1.0 / reference_kelvin) + (1.0 / beta) * logf(ohms / reference_ohms));
+    ThermodynamicTemperature::new::<kelvin>(result_kelvin)
+}
+
+/// Convert thermistor resistance to a temperature using Steinhart-Hart equation
+pub fn convert_steinhart(
+    resistance: ElectricalResistance<f32>,
+    a: f64,
+    b: f64,
+    c: f64,
+) -> ThermodynamicTemperature<f32> {
+    let ohms = resistance.get::<ohm>() as f64;
+    
+    let log_omhs = log(ohms);
+    let kelvins = 1.0 / (a + b * log_omhs + c * log_omhs * log_omhs * log_omhs);
+    ThermodynamicTemperature::new::<kelvin>(kelvins as f32)
+}