32×8のフルカラーLEDマトリクスは文字の大きな時計を作るのによく使っています。LEDマトリクスの値段は2022年5月の時点で2799円でした。
今回はそれを見ていたKさんから４枚連結して32×32でドット絵の表示器を作りたいとのリクエストがありました。それなりの値段になるので、Aliexpressで探すと1150円です。
32×32=1024個のLEDは全てフルに点灯するわけではありませんが、USBからの給電では不安なので5V 4AのAC/DCアダプター電源を使います。コネクタを使って４枚を連結します。
４枚を横に並べてコネクタで接続するとLEDは直列に接続されるので楽なのですが、縦に並べると下の絵のようになります。
(x,y)を指定するとLEDの番号がわかる関数serial_pos(x,y)を作って対応します。ドット絵のデータはimage1に書きます。1024個のデータなので大変だろうと思いましたが、エクセルファイルにドット絵を書き出すプログラムが公開されているようなので、カンマ区切りで出力してコピペの後少し修正すればそんなには面倒では無いようです。色はpalette14で指定します。
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 |
from neopixel import Neopixel import utime numpix = 1024 # 32*32 = 1024 din_pin = 14 strip = Neopixel(numpix, 0, din_pin, "GRB") def serial_pos(x,y): if x < 0 or x >= 32: x = 0 if y < 0 or y >= 32: y = 0 if y < 8: if x % 2 ==0: pos = 8 * x + y else: pos = 8 * x +7 - y pos = pos + 768 elif y < 16: y = y - 8 x = 31 - x y = 7 - y if x % 2 ==0: pos = 8 * x + y else: pos = 8 * x +7 - y pos = pos + 512 elif y < 24: y = y - 16 if x % 2 ==0: pos = 8 * x + y else: pos = 8 * x +7 - y pos = pos + 256 elif y < 32: y = y - 24 x = 31 - x y = 7 - y if x % 2 ==0: pos = 8 * x + y else: pos = 8 * x +7 - y pos = pos + 0 else: pos = 1023 return(pos) palette14 = [[0,0,0],[64,32,0],[64,64,0],[32,64,0],[0,64,0],[0,32,0], [0,64,64],[0,32,64],[0,0,32],[32,0,64],[64,0,64],[64,0,32], [64,64,64],[0,0,0]] image0=[ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ] def show_image(img): for y in range(32): for x in range(32): px_pos = serial_pos(x,y) img_pos=y*32+x pal=img[img_pos] strip.set_pixel(px_pos,(palette14[pal][0], palette14[pal][1], palette14[pal][2])) strip.show() while True: show_image(image1) #utime.sleep(1) show_image(image0) #utime.sleep(1) |