Add flowsensor prototype, add canbus to backplane

rust/src/config.rs

@@ -58,6 +58,7 @@ pub struct TankConfig {
     pub tank_warn_percent: u8,
     pub tank_empty_percent: u8,
     pub tank_full_percent: u8,
+    pub ml_per_pulse: f32
 }
 impl Default for TankConfig {
     fn default() -> Self {
@@ -68,6 +69,7 @@ impl Default for TankConfig {
             tank_warn_percent: 40,
             tank_empty_percent: 5,
             tank_full_percent: 95,
+            ml_per_pulse: 0.0,
         }
     }
 }
@@ -110,6 +112,7 @@ pub struct PlantConfig {
     pub mode: PlantWateringMode,
     pub target_moisture: f32,
     pub pump_time_s: u16,
+    pub pump_limit_ml: u16,
     pub pump_cooldown_min: u16,
     pub pump_hour_start: u8,
     pub pump_hour_end: u8,
@@ -129,6 +132,7 @@ impl Default for PlantConfig {
             mode: PlantWateringMode::OFF,
             target_moisture: 40.,
             pump_time_s: 30,
+            pump_limit_ml: 5000,
             pump_cooldown_min: 60,
             pump_hour_start: 9,
             pump_hour_end: 20,