add cheerlights example!

Author: brentru

adafruit_wiznet5k/adafruit_wiznet5k_cheerlights.py

@@ -0,0 +1,66 @@
+import time
+import board
+import busio
+from digitalio import DigitalInOut
+
+from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
+import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket
+import adafruit_requests as requests
+
+import neopixel
+import adafruit_fancyled.adafruit_fancyled as fancy
+
+cs = DigitalInOut(board.D10)
+spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
+
+# Initialize ethernet interface with DHCP
+eth = WIZNET5K(spi_bus, cs)
+
+# Initialize a requests object with a socket and ethernet interface
+requests.set_socket(socket, eth)
+
+DATA_SOURCE = "http://api.thingspeak.com/channels/1417/feeds.json?results=1"
+DATA_LOCATION = ["feeds", 0, "field2"]
+
+# neopixels
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.3)
+pixels.fill(0)
+
+attempts = 3 # Number of attempts to retry each request
+failure_count = 0
+response = None
+
+# we'll save the value in question
+last_value = value = None
+
+while True:
+    try:
+        print("Fetching json from", DATA_SOURCE)
+        response = requests.get(DATA_SOURCE)
+        print(response.json())
+        value = response.json()
+        for key in DATA_LOCATION:
+            value = value[key]
+            print(value)
+        response.close()
+        failure_count = 0
+    except AssertionError as error:
+        print("Request failed, retrying...\n", error)
+        failure_count += 1
+        if failure_count >= attempts:
+            raise AssertionError("Failed to resolve hostname, \
+                                  please check your router's DNS configuration.")
+        continue
+    if not value:
+        continue
+    if last_value != value:
+        color = int(value[1:], 16)
+        red = color >> 16 & 0xFF
+        green = color >> 8 & 0xFF
+        blue = color& 0xFF
+        gamma_corrected = fancy.gamma_adjust(fancy.CRGB(red, green, blue)).pack()
+
+        pixels.fill(gamma_corrected)
+        last_value = value
+    response = None
+    time.sleep(60)