use ThermodynamicTemperature

src/channel_state.rs

@@ -1,7 +1,13 @@
 use smoltcp::time::Instant;
 use uom::si::{
-    f64::ElectricPotential,
+    f64::{
+        ElectricPotential,
+        ElectricalResistance,
+        ThermodynamicTemperature,
+    },
     electric_potential::volt,
+    electrical_resistance::ohm,
+    temperature_interval::kelvin,
 };
 use crate::{
     ad7172,
@@ -39,9 +45,10 @@ impl ChannelState {
     }
 
     /// Update PID state on ADC input, calculate new DAC output
-    pub fn update_pid(&mut self) -> f64 {
+    pub fn update_pid(&mut self) {
         // Update PID controller
-        self.pid.update(self.get_temperature().unwrap())
+        // self.pid.update(self.get_temperature().unwrap().get::<kelvin>())
+        // TODO: add output field
     }
 
     pub fn get_adc(&self) -> Option<ElectricPotential> {
@@ -49,8 +56,10 @@ impl ChannelState {
         Some(ElectricPotential::new::<volt>(volts))
     }
 
-    pub fn get_temperature(&self) -> Option<f64> {
+    pub fn get_temperature(&self) -> Option<ThermodynamicTemperature> {
         let r = self.get_adc()?.get::<volt>();
+        // TODO:
+        let r = ElectricalResistance::new::<ohm>(r);
         let temperature = self.sh.get_temperature(r);
         Some(temperature)
     }

src/channels.rs

@@ -76,7 +76,8 @@ impl Channels {
             };
             if let Some(dac_value) = dac_value {
                 // Forward PID output to i_set DAC
-                self.set_dac(channel.into(), ElectricPotential::new::<volt>(dac_value));
+                // TODO:
+                // self.set_dac(channel.into(), ElectricPotential::new::<volt>(dac_value));
             }
 
             channel

src/main.rs

@@ -34,10 +34,12 @@ use uom::{
         f64::{
             ElectricPotential,
             ElectricalResistance,
+            ThermodynamicTemperature,
         },
         electric_current::ampere,
         electric_potential::volt,
         electrical_resistance::ohm,
+        thermodynamic_temperature::degree_celsius,
     },
 };
 
@@ -260,9 +262,19 @@ fn main() -> ! {
                                             socket, "channel {}: Steinhart-Hart equation parameters",
                                             channel,
                                         );
-                                        let _ = writeln!(socket, "- t0={}", state.sh.t0);
+                                        let _ = writeln!(socket, "- t0={}", state.sh.t0.into_format_args(degree_celsius, Abbreviation));
                                         let _ = writeln!(socket, "- b={}", state.sh.b);
-                                        let _ = writeln!(socket, "- r0={}", state.sh.r0);
+                                        let _ = writeln!(socket, "- r0={}", state.sh.r0.into_format_args(ohm, Abbreviation));
+                                        match (state.get_adc(), state.get_temperature()) {
+                                            (Some(adc), Some(temp)) => {
+                                                let _ = writeln!(
+                                                    socket, "- adc={} temp={:.3}K",
+                                                    adc.into_format_args(volt, Abbreviation),
+                                                    temp.into_format_args(degree_celsius, Abbreviation),
+                                                );
+                                            }
+                                            _ => {}
+                                        }
                                         let _ = writeln!(socket, "");
                                     }
                                 }
@@ -361,9 +373,9 @@ fn main() -> ! {
                                     let sh = &mut channels.channel_state(channel).sh;
                                     use command_parser::ShParameter::*;
                                     match parameter {
-                                        T0 => sh.t0 = value,
+                                        T0 => sh.t0 = ThermodynamicTemperature::new::<degree_celsius>(value),
                                         B => sh.b = value,
-                                        R0 => sh.r0 = value,
+                                        R0 => sh.r0 = ElectricalResistance::new::<ohm>(value),
                                     }
                                     let _ = writeln!(socket, "Steinhart-Hart equation parameter updated");
                                 }

src/steinhart_hart.rs

@@ -1,11 +1,23 @@
 use num_traits::float::Float;
+use uom::si::{
+    f64::{
+        ElectricalResistance,
+        ThermodynamicTemperature,
+    },
+    electrical_resistance::ohm,
+    ratio::ratio,
+    thermodynamic_temperature::{degree_celsius, kelvin},
+};
 
 /// Steinhart-Hart equation parameters
 #[derive(Clone, Debug)]
 pub struct Parameters {
-    pub t0: f64,
+    /// Base temperature
+    pub t0: ThermodynamicTemperature,
+    /// Base resistance
+    pub r0: ElectricalResistance,
+    /// Beta
     pub b: f64,
-    pub r0: f64,
 }
 
 impl Parameters {
@@ -14,18 +26,18 @@ impl Parameters {
     /// Result unit: Kelvin
     ///
     /// TODO: verify
-    pub fn get_temperature(&self, r: f64) -> f64 {
-        let inv_temp = 1.0 / self.t0 + (r / self.r0).ln() / self.b;
-        1.0 / inv_temp
+    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: 0.001_4,
-            b: 0.000_000_099,
-            r0: 5_110.0,
+            t0: ThermodynamicTemperature::new::<degree_celsius>(25.0),
+            r0: ElectricalResistance::new::<ohm>(10_000.0),
+            b: 3800.0,
         }
     }
 }