Initial node implementation (#4)

Reviewed-on: #4
Co-authored-by: Zack <zack@bfpower.io>
Co-committed-by: Zack <zack@bfpower.io>

src/transducer/part/lm35.rs

@@ -0,0 +1,22 @@
+use crate::transducer::InvalidValue;
+use uom::si::electric_potential::volt;
+use uom::si::f32;
+use uom::si::thermodynamic_temperature::degree_celsius;
+
+const MIN_VOLTS: f32 = -0.55;
+const MAX_VOLTS: f32 = 1.50;
+const SCALE_FACTOR: f32 = 100.0;
+
+#[inline]
+pub fn convert(
+    voltage: f32::ElectricPotential,
+) -> Result<f32::ThermodynamicTemperature, InvalidValue> {
+    let volts = voltage.get::<volt>();
+
+    if volts >= MIN_VOLTS && volts <= MAX_VOLTS {
+        let celsius = volts * SCALE_FACTOR;
+        Ok(f32::ThermodynamicTemperature::new::<degree_celsius>(celsius))
+    } else {
+        Err(InvalidValue)
+    }
+}