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There are two common approaches. For N rows with M columns each:

One is to simulate the matrix with a one-dimensional array. You
allocate space for N*M objects, as with
T *ptr = malloc(N * M * s ...

As you have seen already by yourself, pullup resistors are vital for the i2c bus, both in the sda and scl lines. It is usually obvious that the sda line is bidirectional, what is not so obvious is tha ...

there is a way to do true simultaneous sampling. It onvolves using many discrete Sample and Hold circuits. You just connect S/h input to your signals, outputs to analog pins of PIC and tie all of writ ...