steinhart_hart: Beta Parameter uom dimensions

The Beta Parameter is not dimensionless, and has unit kelvin.
Incorporate that into the type system.

src/channel.rs

@@ -24,7 +24,7 @@ pub struct Channel<C: ChannelPins> {
     pub vref_meas: ElectricPotential,
     pub shdn: C::Shdn,
     pub vref_pin: C::VRefPin,
-    pub itec_pin: C::ITecPin,
+    pub itec_pin: C::ItecPin,
     /// feedback from `dac` output
     pub dac_feedback_pin: C::DacFeedbackPin,
     pub tec_u_meas_pin: C::TecUMeasPin,

src/pins.rs

@@ -61,7 +61,7 @@ pub trait ChannelPins {
     type DacSync: OutputPin;
     type Shdn: OutputPin;
     type VRefPin;
-    type ITecPin;
+    type ItecPin;
     type DacFeedbackPin;
     type TecUMeasPin;
 }
@@ -76,7 +76,7 @@ impl ChannelPins for Channel0 {
     type DacSync = PE4<Output<PushPull>>;
     type Shdn = PE10<Output<PushPull>>;
     type VRefPin = Channel0VRef;
-    type ITecPin = PA6<Analog>;
+    type ItecPin = PA6<Analog>;
     type DacFeedbackPin = PA4<Analog>;
     type TecUMeasPin = PC2<Analog>;
 }
@@ -91,7 +91,7 @@ impl ChannelPins for Channel1 {
     type DacSync = PF6<Output<PushPull>>;
     type Shdn = PE15<Output<PushPull>>;
     type VRefPin = Channel1VRef;
-    type ITecPin = PB0<Analog>;
+    type ItecPin = PB0<Analog>;
     type DacFeedbackPin = PA5<Analog>;
     type TecUMeasPin = PC3<Analog>;
 }
@@ -108,7 +108,7 @@ pub struct ChannelPinSet<C: ChannelPins> {
     pub dac_sync: C::DacSync,
     pub shdn: C::Shdn,
     pub vref_pin: C::VRefPin,
-    pub itec_pin: C::ITecPin,
+    pub itec_pin: C::ItecPin,
     pub dac_feedback_pin: C::DacFeedbackPin,
     pub tec_u_meas_pin: C::TecUMeasPin,
 }

src/steinhart_hart.rs

@@ -26,7 +26,11 @@ pub struct Parameters {
 impl Parameters {
     /// Perform the resistance to temperature conversion.
     pub fn get_temperature(&self, r: ElectricalResistance) -> ThermodynamicTemperature {
-        let temp = (self.t0.recip() + (r / self.r0).get::<ratio>().ln() / self.b).recip();
+        let t0 = TemperatureInterval::new::<kelvin_interval>(self.t0.get::<kelvin>());
+
+        let inv_temp = 1.0 / t0 + (r / self.r0).get::<ratio>().ln() / self.b;
+        let temp = 1.0 / inv_temp;
+
         ThermodynamicTemperature::new::<kelvin>(temp.get::<kelvin_interval>())
     }
 }