Implementing auto backlight function, reducing to 4 level of backlight. 3rd button cycle through 3 different backlight and auto backlight.

Author: jcoquerygithub

clock.py

@@ -40,6 +40,8 @@ def update_time(self):
         now = "%02d:%02d" % (t[3], t[4])
         self.display.show_day(t[6])
         self.display.show_text(now)
+        if self.display.auto_backlight:
+            self.display.show_icon("AutoLight")
 
     def backlight_callback(self, t):
         self.display.switch_backlight()

display.py

@@ -1,4 +1,4 @@
-from machine import Pin
+from machine import Pin, ADC
 
 from util import singleton
 from utime import sleep_us
@@ -15,6 +15,8 @@ def __init__(self, scheduler):
         self.sdi = Pin(11, Pin.OUT)
         self.clk = Pin(10, Pin.OUT)
         self.le = Pin(12, Pin.OUT)
+        
+        self.ain = ADC(26)
 
         self.row = 0
         self.count = 0
@@ -23,12 +25,17 @@ def __init__(self, scheduler):
         self.disp_offset = 2
         self.initialise_fonts()
         self.initialise_icons()
-        
-        # CPU freq needs to be increase to 250 for better results
-        self.backlight_sleep = [10, 100, 500, 1000, 1500]  # From 10 (low) to 1500(High)
-        self.current_backlight = 4
 
-        scheduler.schedule("enable-leds", 1, self.enable_leds)
+        self.scheduler = scheduler
+
+        # CPU freq needs to be increase to 250 for better results
+        self.backlight_sleep = [10, 100, 500, 1500]  # From 10 (low) to 1500(High)
+        self.current_backlight = 3
+        self.auto_backlight = True
+        self.show_icon("AutoLight")
+        self.update_auto_backlight_value(None)
+        self.scheduler.schedule("enable-leds", 1, self.enable_leds)
+        self.scheduler.schedule("update_auto_backlight_value", 1000, self.update_auto_backlight_value)
 
     def enable_leds(self, t):
         self.count += 1
@@ -99,11 +106,30 @@ def sidelight_off(self):
         self.leds[0][5] = 0
 
     def switch_backlight(self):
-        if self.current_backlight == 4:
+        if self.auto_backlight:
+            self.auto_backlight = False
+            self.hide_icon("AutoLight")
             self.current_backlight = 0
+            self.scheduler.remove("update_auto_backlight_value")
+        elif self.current_backlight == 3:
+            self.show_icon("AutoLight")
+            self.auto_backlight = True
+            self.update_auto_backlight_value(None)
+            self.scheduler.schedule("update_auto_backlight_value", 1000, self.update_auto_backlight_value)
         else:
             self.current_backlight += 1
 
+    def update_auto_backlight_value(self, t):
+        aim = self.ain.read_u16()
+        if aim > 60000: # Low light
+            self.current_backlight = 0
+        elif aim > 58000:
+            self.current_backlight = 1
+        elif aim > 10000:
+            self.current_backlight = 2
+        else:
+            self.current_backlight = 3
+
     def print(self):
         for row in range(0, 8):
             for pos in range(0, 24):

scheduler.py

@@ -22,6 +22,11 @@ def start(self):
     def schedule(self, name, duration, callback):
         self.schedules.append(self.Schedule(name, duration, callback))
 
+    def remove(self, name):
+        for schedule in self.schedules:
+            if schedule.name == name:
+                self.schedules.remove(schedule)
+
     def event_callback(self, t):
         for schedule in self.schedules:
             if schedule.duration == 1: