Hello, I' m trying to build a multi channel counter using 4 GPIO ports to measure the frequency of 10 MHz signal source coming from different sources (4 source/4 counters). I can measure the frequency based on a counting process for one channel succesfully, however, connection of a second and more signal inputs destroy the complete measurement! There is huge oscillation and some offset. How can I solve this issue? Lately I started to think that this board is not capable of doing this job. If you think the same, then please make a suggestion for a better board with a short explanation about the differences. Thanks in advance...
