Merge pull request #12 from kattni/add-8-led-example

Add 8 LED example.

Author: ladyada

examples/74hc595_8_led.py

@@ -0,0 +1,27 @@
+import time
+import board
+import digitalio
+import adafruit_74hc595
+
+latch_pin = digitalio.DigitalInOut(board.D5)
+sr = adafruit_74hc595.ShiftRegister74HC595(board.SPI(), latch_pin)
+
+# Create the pin objects in a list
+pins = [sr.get_pin(n) for n in range(8)]
+
+while True:
+    for _ in range(2):  # Run the chase animation twice
+        for enabled_pin in range(len(pins)):
+            for pin_number, pin in enumerate(pins):
+                if pin_number == enabled_pin:
+                    pin.value = True
+                else:
+                    pin.value = False
+                time.sleep(0.01)
+    for _ in range(3):  # Run the blink animation three times
+        for pin in pins:
+            pin.value = True
+        time.sleep(0.5)
+        for pin in pins:
+            pin.value = False
+        time.sleep(0.5)