Merge pull request #799 from adafruit/Matrix_7-Segment_LED_Backpack_Raspberry_Pi

Matrix 7 segment led backpack raspberry pi

Author: ladyada

Matrix_7-Segment_LED_Backpack_Raspberry_Pi/Matrix_8x8_LED_Backpack-40-pin.fzz

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+# Matrix_7-Segment_LED_Backpack_Raspberry_Pi
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/matrix-7-segment-led-backpack-with-the-raspberry-pi/

Matrix_7-Segment_LED_Backpack_Raspberry_Pi/README.md

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+# Import all board pins.
+import time
+import board
+import busio
+from adafruit_ht16k33 import matrix
+
+# Create the I2C interface.
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# creates a 8x8 matrix:
+matrix = matrix.Matrix8x8(i2c)
+
+# edges of an 8x8 matrix
+col_max = 8
+row_max = 8
+
+# Clear the matrix.
+matrix.fill(0)
+col = 0
+row = 0
+
+while True:
+
+    # illuminate a column one LED at a time
+    while col < col_max:
+        matrix[row, col] = 1
+        col += 1
+        time.sleep(.2)
+
+    # next row when previous column is full
+    if row < row_max:
+        row += 1
+        col = 0
+
+    # clear matrix, start over
+    else:
+        row = col = 0
+        matrix.fill(0)

Matrix_7-Segment_LED_Backpack_Raspberry_Pi/matrix8x8_test.py

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+import time
+import datetime
+from adafruit_ht16k33 import segments
+import board
+import busio
+
+# Create the I2C interface.
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# Create the LED segment class.
+# This creates a 7 segment 4 character display:
+display = segments.Seg7x4(i2c)
+
+# clear display
+display.fill(0)
+
+while True:
+    # get system time
+    now = datetime.datetime.now()
+    hour = now.hour
+    minute = now.minute
+    second = now.second
+
+    # setup HH:MM for display and print it
+    clock = '%02d%02d' % (hour,minute)          # concat hour + minute, add leading zeros
+    display.print(clock)
+
+    # Toggle colon when displaying time
+    if second % 2:
+        display.print(':')                      # Enable colon every other second
+    else:
+        display.print(';')                      # Turn off colon
+
+    time.sleep(0.5)

Matrix_7-Segment_LED_Backpack_Raspberry_Pi/sevensegment_clock.py

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+import time
+import board
+import busio
+from adafruit_ht16k33 import segments
+
+# Create the I2C interface.
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# Create the LED segment class.
+# This creates a 7 segment 4 character display:
+display = segments.Seg7x4(i2c)
+
+# Clear the display.
+display.fill(0)
+
+# Can just print a number
+display.print(42)
+time.sleep(1)
+
+# Set the first character to '1':
+display[0] = '1'
+# Set the second character to '2':
+display[1] = '2'
+# Set the third character to 'A':
+display[2] = 'A'
+# Set the forth character to 'B':
+display[3] = 'B'
+time.sleep(1)
+
+numbers = [0.0, 1.0, -1.0, 0.55, -0.55, 10.23, -10.2, 100.5, -100.5]
+
+# print negative and positive floating point numbers
+for i in numbers:
+    display.print(i)
+    time.sleep(0.5)
+
+# print hex values, enable colon
+for i in range(0xFF):
+    display.fill(0)
+    display.print(':')
+    display.print(hex(i))
+    time.sleep(0.25)