Freenove Ultimate Starter Kit - Page 217

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Chapter 19 74HC595 & LED Matrix
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Python Code 19.1.1 LEDMatrix
First observe the project result, and then analyze the code.
1. Use cd command to enter 19.1.1_LEDMatrix directory of Python language.
cd ~/Freenove_Ultimate_Starter_Kit_for_Raspberry_Pi/Code/Python_Code/19.1.1_LEDMatrix
2. Use python command to execute python code “LEDMatrix.py”.
python LEDMatrix.py
After the program is executed, LEDMatrix will display a smiling face, and then the display scrolling character
"0-F", circularly.
The following is the program code:
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im port RPi. GPIO as GPIO
im port time
LSBFIRST = 1
MSBFIRST = 2
#define the pins connect to 74HC595
dataPin = 11 #DS Pin of 74HC595(Pin14)
latchPin = 13 #ST_CP Pin of 74HC595(Pin12)
clockPin = 15 #SH_CP Pin of 74HC595(Pin11)
pic = [0x1c,0x22,0x51,0x45,0x45,0x51,0x22,0x1c]# data of smiling face
data = [#data of "0-F"
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, # " "
0x00, 0x00, 0x3E, 0x41, 0x41, 0x3E, 0x00, 0x00, # "0"
0x00, 0x00, 0x21, 0x7F, 0x01, 0x00, 0x00, 0x00, # "1"
0x00, 0x00, 0x23, 0x45, 0x49, 0x31, 0x00, 0x00, # "2"
0x00, 0x00, 0x22, 0x49, 0x49, 0x36, 0x00, 0x00, # "3"
0x00, 0x00, 0x0E, 0x32, 0x7F, 0x02, 0x00, 0x00, # "4"
0x00, 0x00, 0x79, 0x49, 0x49, 0x46, 0x00, 0x00, # "5"
0x00, 0x00, 0x3E, 0x49, 0x49, 0x26, 0x00, 0x00, # "6"
0x00, 0x00, 0x60, 0x47, 0x48, 0x70, 0x00, 0x00, # "7"
0x00, 0x00, 0x36, 0x49, 0x49, 0x36, 0x00, 0x00, # "8"
0x00, 0x00, 0x32, 0x49, 0x49, 0x3E, 0x00, 0x00, # "9"
0x00, 0x00, 0x3F, 0x44, 0x44, 0x3F, 0x00, 0x00, # "A"
0x00, 0x00, 0x7F, 0x49, 0x49, 0x36, 0x00, 0x00, # "B"
0x00, 0x00, 0x3E, 0x41, 0x41, 0x22, 0x00, 0x00, # "C"
0x00, 0x00, 0x7F, 0x41, 0x41, 0x3E, 0x00, 0x00, # "D"
0x00, 0x00, 0x7F, 0x49, 0x49, 0x41, 0x00, 0x00, # "E"
0x00, 0x00, 0x7F, 0x48, 0x48, 0x40, 0x00, 0x00, # "F"
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, # " "
]
def setup():
GPIO. setmode(GPIO.BOARD) # Number GPIOs by its physical location
GPIO. setup(dataPin, GPIO. OUT)
GPIO. setup(latchPin, GPIO. OUT)
GPIO. setup(clockPin, GPIO. OUT)