canibalised plyer compass example

buildozer.spec

@@ -36,7 +36,7 @@ version = 0.1
 
 # (list) Application requirements
 # comma separated e.g. requirements = sqlite3,kivy
-requirements = python3,kivy,mapview,plyer,requests,urllib3,chardet,idna
+requirements = python3,kivy,hostpython3,mapview,plyer,requests,urllib3,chardet,idna
 
 # (str) Custom source folders for requirements
 # Sets custom source for any requirements with recipes

flockompass.kv

@@ -1,6 +1,6 @@
 #:import random random.random
 #:import RiseInTransition kivy.uix.screenmanager.RiseInTransition
-
+#:import facade plyer.compass
 
 
 <MapScreen>:
@@ -36,38 +36,76 @@
 
 
 <CompassScreen>:
+    facade: facade
+    orientation: 'vertical'
+    padding: '20dp'
+    spacing: '10dp'
     BoxLayout:
-        orientation: 'vertical'        
-        canvas:
-            Color:
-                rgb: .98, .98, .98
-            Rectangle:
-                size: self.size
+        orientation: 'vertical'
+        BoxLayout:
+            orientation: 'horizontal'
+            size_hint: 1, .1
+            Button:
+                id: enable_button
+                text: 'Enable Sensor'
+                disabled: False
+                on_release:
+                    root.enable()
+                    disable_button.disabled = not disable_button.disabled
+                    enable_button.disabled = not enable_button.disabled
+            Button:
+                id: disable_button
+                text: 'Disable Sensor'
+                disabled: True
+                on_release:
+                    root.disable()
+                    disable_button.disabled = not disable_button.disabled
+                    enable_button.disabled = not enable_button.disabled
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: "Earth's Magnetic Field"
+            Label:
+                text: 'including hard iron calibration'
+            Label:
+                text: '(' + str(root.x_calib) + ','
+            Label:
+                text: str(root.y_calib) + ','
+            Label:
+                text: str(root.z_calib) + ')'
+    
+    # BoxLayout:
+    #     orientation: 'vertical'        
+    #     canvas:
+    #         Color:
+    #             rgb: .98, .98, .98
+    #         Rectangle:
+    #             size: self.size
 
-        Image:
-            source: 'rose.png'
+    #     Image:
+    #         source: 'rose.png'
 
-        Image:
-            source: 'needle.png'                    
+    #     Image:
+    #         source: 'needle.png'                    
         
         
-        ActionBar:
-            pos_hint: {'top':1}
-            ActionView:
-                use_separator: True
-                ActionPrevious:
-                    title: 'Social Cycling'
-                    with_previous: False
-                ActionButton:
-                    important: True    
-                    text: 'set destination'
-                    on_press: root.manager.current = 'map' 
+    #     ActionBar:
+    #         pos_hint: {'top':1}
+    #         ActionView:
+    #             use_separator: True
+    #             ActionPrevious:
+    #                 title: 'Social Cycling'
+    #                 with_previous: False
+    #             ActionButton:
+    #                 important: True    
+    #                 text: 'set destination'
+    #                 on_press: root.manager.current = 'map' 
 
 
 
-        Label:
-            text: app.gps_location
+    #     Label:
+    #         text: app.gps_location
 
-        Label:
-            text: app.gps_status
+    #     Label:
+    #         text: app.gps_status
                     

main.py

@@ -1,4 +1,5 @@
 from kivy.app import App
+from kivy.clock import Clock
 from kivy.uix.screenmanager import ScreenManager, Screen, RiseInTransition
 from kivy.properties import NumericProperty, StringProperty
 from kivy.lang import Builder
@@ -16,6 +17,21 @@ class MapScreen(Screen):
     
 class CompassScreen(Screen):
     hue = NumericProperty(0)
+    x_calib = NumericProperty(0)
+    y_calib = NumericProperty(0)
+    z_calib = NumericProperty(0)
+    def enable(self):
+        self.facade.enable()
+        Clock.schedule_interval(self.get_field, 1 / 20.)
+
+    def disable(self):
+        self.facade.disable()
+        Clock.unschedule(self.get_field)
+
+    def get_field(self, dt):
+        if self.facade.field != (None, None, None):
+            self.x_calib, self.y_calib, self.z_calib = self.facade.field
+    
 
     
 class FlockompassApp(App):