You may be asking what AVR is? AVR is a standard abbreviation used to classify Atmel microcontrollers. ICSP stands for In Circuit Serial Programming, it is a standard way to program AVR chips. It is the ICSP header that allows the microcontroller to receive the firmware or program that does all the advanced functionalities that are desired. Without this firmware the code found in the Arduino IDE would not be compatible with the microcontroller. The main controller on the Arduino is a microcontroller that has a specific firmware on it in order to receive serial data and be programmed that way through USB. However, technology is growing and there are already microprocessors that support USB protocol out of the box, yet they still have to be loaded with a specific firmware or program to run in a desired way. They are those six pins that stick out, organized in a two-row three-column orientation.Īs Arduino enthusiasts become familiar with the concept of microcontroller programming, they realize that programming is not as simple as plugging a USB cable into the microcontroller and pressing upload. One of these things are the ICSP headers. As soon as we start getting familiar with the basics of Arduino, we start noticing some interesting components that are not commonly used on the Arduino.
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