The following example will illuminate the matrix rows and columns one pixel at a time.
# SPDX-FileCopyrightText: 2019 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT
# 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] = 2
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)
We can easily copy this code onto our Pi's home directory using the 'wget' command and then run it using the following commands.
cd wget https://raw.githubusercontent.com/adafruit/Adafruit_Learning_System_Guides/Matrix_7-Segment_LED_Backpack_Raspberry_Pi/Matrix_7-Segment_LED_Backpack_Raspberry_Pi/matrix8x8_test.py python3 ./matrix8x8_test.py
Which should result in something like the following:
