How to find a value stored in an SD card and verify that it matches a specific value entered?
Where's your code?
We can only find codes for inbound or storing data in the SD but not the outbound or reading data from it.
The IDE should have examples of both. You cane also check out the sdfat library.
we already know how to open the file from an sd card, but how can we get the corresponding user for the password that was entered?