Update APA102 examples

examples/led/apa102_bounce.rb

@@ -15,10 +15,9 @@
 # Move along the strip and back, one pixel at a time.
 positions = (0..PIXELS-1).to_a + (1..PIXELS-2).to_a.reverse
 
-board = Denko::Board.new(Denko::Connection::Serial.new)
-
 # Use the default hardware SPI bus.
-bus = Denko::SPI::Bus.new(board: board)
+board = Denko::Board.new(Denko::Connection::Serial.new)
+bus   = Denko::SPI::Bus.new(board: board)
 strip = Denko::LED::APA102.new(bus: bus, length: PIXELS)
 
 loop do
@@ -27,7 +26,7 @@
       strip.clear
       strip[index] = color
       strip.show
-      sleep 0.05
+      sleep 0.025
     end
   end
 end

examples/led/apa102_fade.rb

@@ -9,36 +9,36 @@
 BLUE   = [0, 0, 255]
 WHITE  = [255, 255, 255]
 COLORS = [RED, GREEN, BLUE, WHITE]
-PIXELS = 3
+PIXELS = 4
 
 # Get all the brightness values as an array.
-brightness_steps = (0..31).to_a
-
-board = Denko::Board.new(Denko::Connection::Serial.new)
+brightness_steps = (0..31).to_a + (1..30).to_a.reverse
 
 # Use the default hardware SPI bus.
-bus = Denko::SPI::Bus.new(board: board)
+board = Denko::Board.new(Denko::Connection::Serial.new)
+bus   = Denko::SPI::Bus.new(board: board)
 strip = Denko::LED::APA102.new(bus: bus, length: PIXELS)
 
-# Test global brightness control first.
 strip[0] = RED
 strip[1] = GREEN
 strip[2] = BLUE
+strip[3] = WHITE
 
-# Fade up from 0 brightness then back down.
-(brightness_steps + brightness_steps.reverse).each do |value|
+# Fade all 4 in sync using global brightness control.
+brightness_steps.each do |value|
   strip.brightness = value
   strip.show
   sleep 0.05
 end
 
-# Test per-pixel brightness by fading different pixels different directions.
-loop do
-  (brightness_steps + brightness_steps.reverse).each do |value|
-    strip[0] = RED   +  [value]
-    strip[1] = GREEN +  [31 - value]
-    strip[2] = BLUE  +  [value]
-    strip.show
-    sleep 0.1
-  end
+# Set 4th pixel back to full brightness white.
+strip[3] = WHITE + [31]
+
+# Fade per-pixel, in different directions.
+brightness_steps.cycle do |value|
+  strip[0] = RED   +  [value]
+  strip[1] = GREEN +  [31 - value]
+  strip[2] = BLUE  +  [value]
+  strip.show
+  sleep 0.025
 end