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3.4 SD Card
The FAT32 format SD Card included with Avo is industrial grade with 2Gbyte of memory space. The
purpose of this card is:
•
Time-stamped data backup from sensor measurements (.dat files)
•
HTTP destination setup (destin.txt)
•
APN setup if using GSM network (destin.txt)
•
Cell connection diagnosis (diagnost.log)
•
Loading firmware updates (update.hex)
3.5A Data Backup
A backup data file is stored on the SD Card for all sensor readings. The SD Card is automatically updated
with any new logged data every 5 minutes. The format of the file is ASCII, and the extension is .DAT. The
filename will be the date when the data backup began. For example, if Avo begins transmitting on Oct, 10,
2015, then the file name will be 20151010.dat.
Avo appends this file for one month. At the beginning of each month a new backup data file is created
that will include all sensor measurement taken for the month. To start a new backup file cycle power.
Data will be logged to the internal data buffer until successful connection to cellular network and to the
HTTP destination. Without the SD card, the data buffer will be cleared after successful transmission and
no data will be backed-up.
