Merge pull request adafruit#1226 from jedgarpark/bitcoin-matrix

first commit bitcoin matrix code and bg

Author: ladyada

Bitcoin_Matrix/bitcoin_background.bmp

@@ -0,0 +1,53 @@
+# Run on Metro M4 Airlift w RGB Matrix shield and 64x32 matrix display
+# show current value of Bitcoin in USD
+
+import time
+import board
+import terminalio
+from adafruit_matrixportal.matrixportal import MatrixPortal
+
+# You can display in 'GBP', 'EUR' or 'USD'
+CURRENCY = "USD"
+# Set up where we'll be fetching data from
+DATA_SOURCE = "https://api.coindesk.com/v1/bpi/currentprice.json"
+DATA_LOCATION = ["bpi", CURRENCY, "rate_float"]
+
+
+def text_transform(val):
+    if CURRENCY == "USD":
+        return "$%d" % val
+    if CURRENCY == "EUR":
+        return "‎€%d" % val
+    if CURRENCY == "GBP":
+        return "£%d" % val
+    return "%d" % val
+
+
+# the current working directory (where this file is)
+cwd = ("/" + __file__).rsplit("/", 1)[0]
+
+matrixportal = MatrixPortal(
+    url=DATA_SOURCE,
+    json_path=DATA_LOCATION,
+    status_neopixel=board.NEOPIXEL,
+    default_bg=cwd + "/bitcoin_background.bmp",
+    debug=True,
+)
+
+matrixportal.add_text(
+    text_font=terminalio.FONT,
+    text_position=(27, 16),
+    text_color=0x3d1f5c,
+    text_transform=text_transform,
+)
+matrixportal.preload_font(b"$012345789")  # preload numbers
+matrixportal.preload_font((0x00A3, 0x20AC))  # preload gbp/euro symbol
+
+while True:
+    try:
+        value = matrixportal.fetch()
+        print("Response is", value)
+    except (ValueError, RuntimeError) as e:
+        print("Some error occured, retrying! -", e)
+
+    time.sleep(3 * 60)  # wait 3 minutes