Not displaying to serial monitor or recording data

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i have 6 arduino's (uno) connected dataloggins shields set record environmental data relative humidity, temperature, barometric pressure , light levels.  1 of them did not record data on last week, never started recording when plugged battery in.  however, rest of them fine.  if plug particular malfunctioning unit computer try , reset time using ds1307 sketch uploads nothing @ displays on serial monitor.  tried uploading own personal sketch records data sensors , usual beginning message displays... (see below)

initializing sd card...card initialized.
writing column headers bat.csv...done.
getting environmental data ...

but after of data supposed display every 20 sec ...... , nothing!  said, of rest of arduino's functioning fine sketch, , serial monitor.  serial monitor working since displayed beginning message, , letting me upload sketch.  have no idea go here.  suggestions?

figure makes non functioning arduino different functioning ones.


Arduino Forum > Using Arduino > Displays > Not displaying to serial monitor or recording data


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