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# log the accelerometer values to a .csv-file on the SD-card
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import pyb
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accel = pyb.Accel() # create object of accelerometer
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blue = pyb.LED(4) # create object of blue LED
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# open file to write data - /sd/ is the SD-card, /flash/ the internal memory
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log = open("/sd/log.csv", "w")
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blue.on() # turn on blue LED
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# do 100 times (if the board is connected via USB, you can't write longer because the PC tries to open the filesystem which messes up your file.)
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for i in range(100):
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t = pyb.millis() # get time since reset
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x, y, z = accel.filtered_xyz() # get acceleration data
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log.write("{},{},{},{}\n".format(t, x, y, z)) # write data to file
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log.close() # close file
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blue.off() # turn off LED
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