Philip,

Although I often find Erik's style a little abrasive I do agree with his response in this case. Your questions have revealed that you are a complete beginner to electronics and programming microcontrollers - it is perfectly reasonable for those who are trying to help you to check which of the basics you are and are not familiar with. I suggest that you should accept all advice and suggestions gratefully rather than complaining that you are being patronised. Do also please remember that nobody on this forum is actually _obliged_ to help you, and are unlikely to continue to try if you respond as you have done.