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This module is also suitable if you want to reprogram it with CleanFlight BlackBox firmware, see here You can then use CleanFlight BlackBox Tools to examine data Schematic for Openlog Serial Data Logger is here.
I have used 8Mhz versions of this before, but the 16MHz version is great as it allows me to use the code I already had for 16MHz version. It wrks very well and is stable
They are very good for displaying numbers in any order. I use 4 displays to show results in one
part of my program and the other 4 displays to show the result of a different place in the program.
You do need to understand the MAXTOR set-up software before anything happens.