Simple test
Ensure your device works with this simple test.
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4import time
5import board
6import digitalio
7from adafruit_max7219 import matrices
8
9
10# You may need to change the chip select pin depending on your wiring
11spi = board.SPI()
12cs = digitalio.DigitalInOut(board.D4)
13
14matrix = matrices.Matrix8x8(spi, cs)
15while True:
16 print("Cycle start")
17 # all lit up
18 matrix.fill(True)
19 matrix.show()
20 time.sleep(0.5)
21
22 # all off
23 matrix.fill(False)
24 matrix.show()
25 time.sleep(0.5)
26
27 # one column of leds lit
28 for i in range(8):
29 matrix.pixel(1, i, 1)
30 matrix.show()
31 time.sleep(0.5)
32 # now scroll the column to the right
33 for j in range(8):
34 matrix.scroll(1, 0)
35 matrix.show()
36 time.sleep(0.5)
37
38 # show a string one character at a time
39 adafruit = "Adafruit"
40 for char in adafruit:
41 matrix.fill(0)
42 matrix.text(char, 0, 0)
43 matrix.show()
44 time.sleep(1.0)
45
46 # scroll the last character off the display
47 for i in range(8):
48 matrix.scroll(-1, 0)
49 matrix.show()
50 time.sleep(0.5)
51
52 # scroll a string across the display
53 for pixel_position in range(len(adafruit) * 8):
54 matrix.fill(0)
55 matrix.text(adafruit, -pixel_position, 0)
56 matrix.show()
57 time.sleep(0.25)
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4import time
5import random
6import board
7import digitalio
8from adafruit_max7219 import bcddigits
9
10
11# You may need to change the chip select pin depending on your wiring
12spi = board.SPI()
13cs = digitalio.DigitalInOut(board.D4)
14
15leds = bcddigits.BCDDigits(spi, cs, nDigits=8)
16while True:
17 # clear display and dim 0
18 leds.brightness(0)
19 leds.clear_all()
20
21 # place 8-digit number on display
22 value = 12345678
23 leds.show_str(0, "{:8}".format(value))
24 leds.show()
25
26 # increase the brightness slowly
27 for i in range(16):
28 leds.brightness(i)
29 time.sleep(0.5)
30
31 leds.brightness(3)
32
33 # show "-HELP-90" on display
34 leds.show_str(6, "90") # show 90 starting at position 6
35 leds.set_digit(0, 10) # show - at position 0
36 leds.set_digit(1, 12) # show H at position 1
37 leds.set_digit(2, 11) # show E at position 2
38 leds.set_digit(3, 13) # show L at position 3
39 leds.set_digit(4, 14) # show P at position 4
40 leds.set_digit(5, 10) # show - at position 5
41
42 leds.show()
43 time.sleep(1.0)
44
45 leds.clear_all()
46 leds.brightness(5)
47
48 # set the two dots and two 4-digit numbers
49 leds.show_dot(2, 1)
50 leds.show_dot(6, 1)
51 leds.show_str(0, " 72.5")
52 leds.show_str(4, "-10.8")
53
54 leds.show()
55 time.sleep(1.0)
56
57 leds.brightness(10)
58 leds.clear_all()
59 # show a 4 character numeric string
60 leds.show_str(0, " 0")
61 leds.show()
62 time.sleep(1.0)
63
64 leds.clear_all()
65 # show 0->8
66 for digit in range(8):
67 leds.set_digit(digit, digit)
68
69 leds.show()
70 time.sleep(1.0)
71
72 # show random 8-digit numbers via show_str
73 for _ in range(10):
74 number = random.uniform(-1.0, 1.0)
75 number *= 10000.0
76 number_string = "{:9.3f}".format(number)
77 leds.clear_all()
78 leds.show_str(0, number_string)
79 leds.show()
80 time.sleep(1.0)
81
82 # show the help string
83 leds.clear_all()
84 leds.show_help(2)
85 leds.show()
86
87 time.sleep(1.0)
1# SPDX-FileCopyrightText: 2021 Daniel Flanagan
2# SPDX-License-Identifier: MIT
3
4import time
5import board
6import digitalio
7from adafruit_max7219 import matrices
8
9
10# You may need to change the chip select pin depending on your wiring
11spi = board.SPI()
12cs = digitalio.DigitalInOut(board.D4)
13
14matrix = matrices.CustomMatrix(spi, cs, 32, 8)
15while True:
16 print("Cycle Start")
17 # all lit up
18 matrix.fill(True)
19 matrix.show()
20 time.sleep(0.5)
21
22 # all off
23 matrix.fill(False)
24 matrix.show()
25 time.sleep(0.5)
26
27 # snake across panel
28 for y in range(8):
29 for x in range(32):
30 if not y % 2:
31 matrix.pixel(x, y, 1)
32 else:
33 matrix.pixel(31 - x, y, 1)
34 matrix.show()
35 time.sleep(0.05)
36
37 # show a string one character at a time
38 adafruit = "Adafruit"
39 matrix.fill(0)
40 for i, char in enumerate(adafruit[:3]):
41 matrix.text(char, i * 6, 0)
42 matrix.show()
43 time.sleep(1.0)
44 matrix.fill(0)
45 for i, char in enumerate(adafruit[3:]):
46 matrix.text(char, i * 6, 0)
47 matrix.show()
48 time.sleep(1.0)
49
50 # scroll the last character off the display
51 for i in range(32):
52 matrix.scroll(-1, 0)
53 matrix.show()
54 time.sleep(0.25)
55
56 # scroll a string across the display
57 for pixel_position in range(len(adafruit) * 8):
58 matrix.fill(0)
59 matrix.text(adafruit, -pixel_position, 0)
60 matrix.show()
61 time.sleep(0.25)