![]() The processor menu only appears if the Arduino Nano is first selected Tools> Processor> ATmega328P (Old Bootloader) The reason is that old Nano boards have an outdated bootloader, which then no longer works with the new Arduino IDE versions. In this case, select the following in the tools menu: That is strange, it has always worked before! The same happens with an Arduino Pro-Mini board. But suddenly, error messages occur when uploading a sketch. Some years ago, I used an Arduino Nano board. Old bootloader upload problems with Arduino Nano and Pro-Mini boards Sometimes I forget to update the zip file so it can happen that something is missing, please let me know that. Therefore I have collected all those libraries in a zip file that you can download HERE. For instance when the library "Timer1" is missing, we receive the compiler message: "'Timer1' was not declared in this scope". I use many libraries, those of others and of myself, and it's a lot of work to install them all. Most problems arise because of missing libraries. This article lists many common problems that may occur when using with Arduino.
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