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# datalogger.py
# Logs the data from the acceleromter to a file on the SD-card
import pyb
# creating objects
accel = pyb.Accel()
blue = pyb.LED(4)
switch = pyb.Switch()
# loop
while True:
# wait for interrupt
# this reduces power consumption while waiting for switch press
pyb.wfi()
# start if switch is pressed
if switch():
pyb.delay(200) # delay avoids detection of multiple presses
blue.on() # blue LED indicates file open
log = open('/sd/log.csv', 'w') # open file on SD (SD: '/sd/', flash: '/flash/)
# until switch is pressed again
while not switch():
t = pyb.millis() # get time
x, y, z = accel.filtered_xyz() # get acceleration data
log.write('{},{},{},{}\n'.format(t,x,y,z)) # write data to file
# end after switch is pressed again
log.close() # close file
blue.off() # blue LED indicates file closed
pyb.delay(200) # delay avoids detection of multiple presses