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Content # this script reads a BMP file and displays it as POV. For optimal results use a BMP that is 11 pixels high. # Put heart.bmp in the root folder! import leds,utime # Determine Brightness Level. You might not wanna use the full values from the BMP BRIGHTNESS = 1.0 FILENAME = "heart.bmp" class BMPError(Exception): pass class POV: def __init__(self, filename=FILENAME): self.filename = filename f = open("/" + self.filename, "rb") if f.read(2) != b'BM': # check signature raise BMPError("Not BitMap file") #turn into int.from_bytes bmpFileSize = int.from_bytes(f.read(4), 'little') f.read(4) # Read & ignore creator bytes self.bmpImageOffset = self.read_le(f.read(4)) # Start of image data headerSize = self.read_le(f.read(4)) self.bmpWidth = self.read_le(f.read(4)) self.bmpHeight = self.read_le(f.read(4)) flip = False print("Size: %d\nImage offset: %d\nHeader size: %d" % (bmpFileSize, self.bmpImageOffset, headerSize)) print("Width: %d\nHeight: %d" % (self.bmpWidth, self.bmpHeight)) if self.read_le(f.read(2)) != 1: raise BMPError("Not singleplane") bmpDepth = self.read_le(f.read(2)) # bits per pixel print("Bit depth: %d" % (bmpDepth)) if bmpDepth != 24: raise BMPError("Not 24-bit") if self.read_le(f.read(2)) != 0: raise BMPError("Compressed file") print("Image OK!") self.rowSize = (self.bmpWidth * 3 + 3) & ~3 # 32-bit line boundary self.fileOffset = f.tell() print("File Offset"+str(self.fileOffset)) f.close() self.read_image() def correct_brightness(self, color): return int(pow((color * BRIGHTNESS) / 255, 2.7) * 255 + 0.5) def getWidth(self): return self.bmpWidth def setFileOffset(self, fileOffset): self.fileOffset = fileOffset def getFileOffset(self): return self.fileOffset def read_le(self, bytes): return int.from_bytes(bytes, 'little') def read_image(self): self.imageArray = [] flip = True rowSize = (self.bmpWidth * 3 + 3) & ~3 f = open("/" + self.filename, "rb") for row in range(self.bmpHeight): rowArray = [] if flip: # Bitmap is stored bottom-to-top order (normal BMP) pos = self.bmpImageOffset + (self.bmpHeight - 1 - row) * rowSize else: # Bitmap is stored top-to-bottom pos = self.bmpImageOffset + row * rowSize f.seek(pos) for col in range(self.bmpWidth): rgb = [f.read(1), f.read(1), f.read(1)] rgb = [int.from_bytes(x, "little") for x in rgb] #BGR RGB Fix t = rgb[0] rgb[0] = rgb[2] rgb[2] = t; #rgb = [self.correct_brightness(x) for x in rgb] rowArray += [rgb] self.imageArray += [rowArray] def getImageArray(self): return self.imageArray def playMe(self): for i in self.imageArray: leds.set_all(i) # LED Pattern utime.sleep_us(2000) # Pixel width leds.set_all([[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]]); utime.sleep_us(100) # Black border between pixels # distance between pictures utime.sleep_ms(10) def play(imagename): myPov = POV(imagename) while True: myPov.playMe() play(FILENAME)