你们好,请问openMV4的串口通信能发出去但是串口接收不了?。
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# Untitled - By: Administrator - 周五 十一月 6 2020 # Single Color RGB565 Blob Tracking Example # # This example shows off single color RGB565 tracking using the OpenMV Cam. import sensor, image, time, math from pyb import UART threshold_index = 0 # 0 for red, 1 for green, 2 for blue # Color Tracking Thresholds (L Min, L Max, A Min, A Max, B Min, B Max) # The below thresholds track in general red/green/blue things. You may wish to tune them... thresholds = [(92, 100, -83, 127, -128, 127), # generic_red_thresholds (30, 100, -64, -8, -32, 32), # generic_green_thresholds (0, 30, 0, 64, -128, 0)] # generic_blue_thresholds sensor.reset() sensor.set_pixformat(sensor.RGB565) sensor.set_framesize(sensor.QVGA) sensor.skip_frames(time = 2000) sensor.set_auto_gain(False) # must be turned off for color tracking sensor.set_auto_whitebal(False) # must be turned off for color tracking clock = time.clock() while(True): clock.tick() # Track elapsed milliseconds between snapshots(). img = sensor.snapshot() # Take a picture and return the image. uart = UART(3,9600) A=0 for blob in img.find_blobs([thresholds[threshold_index]], pixels_threshold=20, area_threshold=20 ): # These values depend on the blob not being circular - otherwise they will be shaky. A=blob.perimeter() # These values are stable all the time. img.draw_rectangle(blob.rect()) img.draw_cross(blob.cx(), blob.cy()) # Note - the blob rotation is unique to 0-180 only. #img.draw_keypoints([(blob.cx(), blob.cy(), int(math.degrees(blob.rotation())))], size=20) print("perimeter: %d" % int (A)) if A >0: a=1 else: a=2 b=uart.write(str(a)) print(b) print(a) print(clock.fps())
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https://singtown.com/learn/50235/
是按照视频步骤操作的吗?