The screen of MP27710.4 records 8 temperature data, once every 3 seconds, how many days can be recorded with the MMC128MB card, how to calculate?
A: The approximate calculation method:
N (Tag) * N (data type, byte) * 24h / d * 3600s / d / 3s / p / 1024 / 1024 = 0.0274658203125 * N (Tag) * N (data type, byte) unit is MB.
If 8 data, each of which is 4 bytes, record the space occupied for 1 day; 0.87890625MB
If it is 128M, the storage days are: 128/0.87890625=145 days.
This is just a simple calculation method. In fact, when storing, you must add the header of the file and other information. It should be no problem for 100 days. However, the main confirmation of the building is that MB is not Mb. Because the above calculation is based on MB.
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