From dc82cd5d07d85bdb96b6a09bac65d636a928c3b0 Mon Sep 17 00:00:00 2001
From: Laurens Valk <laurens@pybricks.com>
Date: Sat, 11 Jul 2020 12:58:15 +0200
Subject: [PATCH] snippets/pup/light: add basic light and math demo

---
 snippets/pup/light/basics.py | 16 ++++++++++++++++
 snippets/pup/light/math.py   | 27 +++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 snippets/pup/light/basics.py
 create mode 100644 snippets/pup/light/math.py

diff --git a/snippets/pup/light/basics.py b/snippets/pup/light/basics.py
new file mode 100644
index 0000000..a659757
--- /dev/null
+++ b/snippets/pup/light/basics.py
@@ -0,0 +1,16 @@
+from pybricks.pupdevices import Light
+from pybricks.parameters import Port
+from pybricks.tools import wait
+
+# Initialize the light.
+light = Light(Port.A)
+
+# Blink the light forever.
+while True:
+    # Turn the light on at 100% brightness.
+    light.on(100)
+    wait(500)
+
+    # Turn the light off.
+    light.off()
+    wait(500)
diff --git a/snippets/pup/light/math.py b/snippets/pup/light/math.py
new file mode 100644
index 0000000..459d32e
--- /dev/null
+++ b/snippets/pup/light/math.py
@@ -0,0 +1,27 @@
+from pybricks.pupdevices import Light
+from pybricks.parameters import Port
+from pybricks.tools import wait, StopWatch
+
+# The math module is part of standard MicroPython:
+# https://docs.micropython.org/en/latest/library/math.html
+from math import pi, cos
+
+# Initialize the light and a StopWatch.
+light = Light(Port.A)
+watch = StopWatch()
+
+# Cosine pattern properties.
+PERIOD = 2000
+MAX = 100
+
+# Make the brightness fade in and out.
+while True:
+    # Get phase of the cosine.
+    phase = watch.time()/PERIOD*2*pi
+
+    # Evaluate the brightness.
+    brightness = (0.5 - 0.5*cos(phase))*MAX
+
+    # Set light brightness and wait a bit.
+    light.on(brightness)
+    wait(10)