From 5f494e00db2f35e715def21713750185b6043528 Mon Sep 17 00:00:00 2001
From: Dave Briccetti <daveb@davebsoft.com>
Date: Wed, 7 Aug 2019 15:05:19 -0700
Subject: [PATCH 1/2] Create an acceleration to LEDs example

---
 ...ayground_acceleration_mapping_neopixels.py | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 examples/circuitplayground_acceleration_mapping_neopixels.py

diff --git a/examples/circuitplayground_acceleration_mapping_neopixels.py b/examples/circuitplayground_acceleration_mapping_neopixels.py
new file mode 100644
index 0000000..b346868
--- /dev/null
+++ b/examples/circuitplayground_acceleration_mapping_neopixels.py
@@ -0,0 +1,52 @@
+"""Maps acceleration (tilt) to Neopixel colors.
+
+x, y, and z acceleration components map to red, green and blue,
+respectively.
+
+When the CPX is level, the lights are blue because there is no acceleration
+on x or y, but on z, gravity pulls at 9.81 meters per second per second (m/s²).
+When banking, the vertical (z) axis is no longer directly aligned with gravity,
+so the blue decreases, and red increases because gravity is now pulling more
+along the x axis. Similarly, when changing the pitch from level, we see blue change
+to green.
+
+This video walks you through the code: https://youtu.be/eNpPLbYx-iA
+"""
+
+from time import sleep
+from adafruit_circuitplayground.express import cpx
+
+cpx.pixels.brightness = 0.2  # Adjust overall brightness as desired, between 0 and 1
+
+
+def color_amount(accel_component):
+    """Convert acceleration component (x, y, or z) to color amount (r, g, or b)"""
+    standard_gravity = 9.81  # Acceleration (m/s²) due to gravity at the earth’s surface
+    accel_magnitude = abs(accel_component)                      # Ignore the direction
+    constrained_accel = min(accel_magnitude, standard_gravity)  # Constrain values
+    normalized_accel = constrained_accel / standard_gravity     # Convert to 0–1
+    return round(normalized_accel * 255)                        # Convert to 0–255
+
+
+def fmt_accel(acceleration):
+    return ', '.join(('{:>6.2f}'.format(axis_value) for axis_value in acceleration))
+
+
+def fmt_rgb(rgb_amounts):
+    return ', '.join(('{:>3d}'.format(rgb_amount) for rgb_amount in rgb_amounts))
+
+
+def log_values(acceleration, rgb_amounts):
+    print('({}) ==> ({})'.format(fmt_accel(acceleration), fmt_rgb(rgb_amounts)))
+
+
+def process():
+    acceleration = cpx.acceleration
+    rgb_amounts = [color_amount(axis_value) for axis_value in acceleration]
+    cpx.pixels.fill(rgb_amounts)
+    log_values(acceleration, rgb_amounts)
+
+
+while True:
+    process()
+    sleep(0.1)

From d0d481ed7e1d9f88e3ed86d9fa4691478449c356 Mon Sep 17 00:00:00 2001
From: Dave Briccetti <daveb@davebsoft.com>
Date: Thu, 8 Aug 2019 13:22:59 -0700
Subject: [PATCH 2/2] Make Adafruit-requested changes

---
 ...ayground_acceleration_mapping_neopixels.py | 20 ++++++++-----------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/examples/circuitplayground_acceleration_mapping_neopixels.py b/examples/circuitplayground_acceleration_mapping_neopixels.py
index b346868..597eb31 100644
--- a/examples/circuitplayground_acceleration_mapping_neopixels.py
+++ b/examples/circuitplayground_acceleration_mapping_neopixels.py
@@ -13,7 +13,7 @@
 This video walks you through the code: https://youtu.be/eNpPLbYx-iA
 """
 
-from time import sleep
+import time
 from adafruit_circuitplayground.express import cpx
 
 cpx.pixels.brightness = 0.2  # Adjust overall brightness as desired, between 0 and 1
@@ -28,25 +28,21 @@ def color_amount(accel_component):
     return round(normalized_accel * 255)                        # Convert to 0–255
 
 
-def fmt_accel(acceleration):
+def format_acceleration():
     return ', '.join(('{:>6.2f}'.format(axis_value) for axis_value in acceleration))
 
 
-def fmt_rgb(rgb_amounts):
+def format_rgb():
     return ', '.join(('{:>3d}'.format(rgb_amount) for rgb_amount in rgb_amounts))
 
 
-def log_values(acceleration, rgb_amounts):
-    print('({}) ==> ({})'.format(fmt_accel(acceleration), fmt_rgb(rgb_amounts)))
+def log_values():
+    print('({}) ==> ({})'.format(format_acceleration(), format_rgb()))
 
 
-def process():
+while True:
     acceleration = cpx.acceleration
     rgb_amounts = [color_amount(axis_value) for axis_value in acceleration]
     cpx.pixels.fill(rgb_amounts)
-    log_values(acceleration, rgb_amounts)
-
-
-while True:
-    process()
-    sleep(0.1)
+    log_values()
+    time.sleep(0.1)