There is a important concept which should be learn before beginning this tutorial. In the topic itself we have specified that we are going to make a PC controlled robot or "Serial" Robot that means a robot which will be driven by serial data coming out from the PC. You first need to understand what is serial communication and what is the difference between serial and parallel communication.
1. Serial Communication and Parallel Communication:
The above video beautifully explains the concepts.
2. Data Rates and Baud Rate:
Now quickly jump to the description section after you have watched the given videos.
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