feat: Allow limiting LED brightness

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>

software/frontend/index.html

@@ -357,7 +357,8 @@
             'root.TAG_TIMEOUT_SECS': 'Tag removal timeout (seconds)',
             'root.TAGMODE': 'Tag mode',
             'root.LED_COUNT': 'Length of WS2182 (Neopixel) LED chain',
-            'root.VOLUME_MAX': 'Maximum volume (0-255)'
+            'root.VOLUME_MAX': 'Maximum volume (0-255)',
+            'root.LED_MAX': 'Maximum LED brightness (0-255)'
         };
         const config_input_override = {
             'root.TAGMODE': {
@@ -399,6 +400,9 @@
             },
             'root.VOLUME_MAX': {
                 'input-type': 'number'
+            },
+            'root.LED_MAX': {
+                'input-type': 'number'
             }
         };
     

software/src/main.py

@@ -76,7 +76,8 @@ config = Configuration()
 
 # Setup LEDs
 np = NeoPixel(hwconfig.LED_DIN, config.get_led_count(), sm=1)
-np.fill((32, 32, 0))
+led_max = config.get_led_max()
+np.fill((led_max, led_max, 0))
 np.write()
 
 
@@ -84,7 +85,7 @@ def run():
     asyncio.new_event_loop()
 
     if machine.Pin(hwconfig.BUTTONS[1], machine.Pin.IN, machine.Pin.PULL_UP).value() == 0:
-        np.fill((0, 0, 32))
+        np.fill((0, 0, led_max))
         np.write()
         # Force default access point
         setup_wifi('', '')
@@ -116,7 +117,7 @@ def run():
                                     buttons=lambda the_app: Buttons(the_app, config, hwconfig),
                                     playlistdb=lambda _: playlistdb,
                                     hwconfig=lambda _: hwconfig,
-                                    leds=lambda _: LedManager(np),
+                                    leds=lambda _: LedManager(np, config),
                                     config=lambda _: config)
             the_app = app.PlayerApp(deps)
 
@@ -149,7 +150,7 @@ def builddb():
 
 def error_blink():
     while True:
-        np.fill((32, 0, 0))
+        np.fill((led_max, 0, 0))
         np.write()
         time.sleep_ms(500)
         np.fill((0, 0, 0))
@@ -166,5 +167,5 @@ if __name__ == '__main__':
             sys.print_exception(ex)
             error_blink()
     else:
-        np.fill((32, 0, 0))
+        np.fill((led_max, 0, 0))
         np.write()

software/src/utils/config.py

@@ -27,7 +27,8 @@ class Configuration:
             'SSID': '',
             'PASSPHRASE': '',
         },
-        'VOLUME_MAX': 255
+        'VOLUME_MAX': 255,
+        'LED_MAX': 255,
     }
 
     def __init__(self, config_path='/config.json'):
@@ -101,6 +102,9 @@ class Configuration:
     def get_volume_max(self) -> int:
         return self._get('VOLUME_MAX')
 
+    def get_led_max(self) -> int:
+        return self._get('LED_MAX')
+
     # For the web API
     def get_config(self) -> Mapping[str, Any]:
         return self.config

software/src/utils/leds.py

@@ -12,10 +12,10 @@ class LedManager:
     PLAYING = const(1)
     REBOOTING = const(2)
 
-    def __init__(self, np):
+    def __init__(self, np, config):
         self.led_state = LedManager.IDLE
+        self.brightness = config.get_led_max() / 255
         self.np = np
-        self.brightness = 0.1
         self.leds = len(self.np)
         asyncio.create_task(self.run())