I was working on a project that involved the use of an SD (Secure Digital) card to log data into a text file. I chose Arduino as it had a vary stable FAT (File Allocation Table) library. I had an Arduino Mega at my disposal and built a resistive network...

What is the need for a clock line in digital communication protocols? This was a question that was posted on a Facebook page. I was surprised to see no one had posted a response. Probably they felt that the question was below standard, lame, stupid or on the worst case...