arduino + K8056

Forum 2005-2010 (read only) General Frequently-Asked Questions
2

I don't know if this is the problem but this:

for (i = 0; i < 20; i = i 1) is wrong.

I asume you mean

for (i = 0; i < 20; i = i + 1) or

for (i = 0; i < 20; i += 1)

EDIT :

Or maybe the signal levels on the Velleman card and Arduinos serial ports are different ??

Or you did not connect the ground of the card to Arduinos ground ??