Merge pull request adafruit#978 from adafruit/TheKitty-patch-113

Add code for the guide "Twinkly Earwarmer Headband"

Author: TheKitty

GemmaM0_Headband/README.md

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+## Twinkly Earwarmer Headband Tutorial code
+
+Code to accompany the tutorial Twinkly Earwarmer Headband (using an Adafruit Gemma M0) by Kathy Ceceri
+
+CircuitPython Code by Anne Barela
+
+See this guide at https://learn.adafruit.com/TwinklyEarwarmer/overview
+
+MIT License, please attribute and include this file.
+
+Adafruit expends resources providing open source materials, please support their work by buying products at https://www.adafruit.com

GemmaM0_Headband/code.py

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+# Gemma M0 Onchip Temperature Sensor
+# Project by Kathy Ceceri
+# CircuitPython by Anne Barela
+# Adafruit Industries, 2019
+
+import time
+import board
+import microcontroller
+import neopixel
+import adafruit_dotstar
+
+ROOM_TEMP = 65.0  # Set this to the temp to change from blue to red (F)
+
+# Set up NeoPixel strand
+pixels = neopixel.NeoPixel(board.D1,  # NeoPixels on pin D1
+                           4,         # Number of Pixels
+                           brightness=0.2)   # Change from 0.0 to 1.0
+
+# For the Gemma M0 onboard DotStar LED
+dotstar = adafruit_dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1)
+
+def deg_f(deg_c):  # Convert Celcius to Fahrenheit
+    return(deg_c * 9 / 5) + 32.0
+
+while True:
+    temp = deg_f(microcontroller.cpu.temperature)
+    if temp > ROOM_TEMP:
+        pixels.fill((255, 0, 0))   # (255,0,0) is red
+        dotstar.fill((255, 0, 0))  # Set to red
+    else:
+        pixels.fill((0, 0, 255))   # (0,0,255) is blue
+        dotstar.fill((0, 0, 255))  # Set to blue
+
+    time.sleep(1.0)  # Wait 1 second