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Arduino nano schematic crystal or resonator11/27/2023 ![]() Open the command line window and navigate to the optiboot directory where omake is located.Īfter a successful make you are rewarded with two new files in the optiboot directory. If you have trouble saving the file make sure that the file is not write protected. Open it with notepad or in my case notepad++.Ĭopy the atmega328 lines and make the changes that I'm showing here (20MHz add).Ĭhange the baud rate to 76.8kilo baud and change the AVR frequency to 20MHz.įinally change the names of the hex and lst files and save the Makefile. Unpack the downloaded folder and find this Makefile. For convenience just use the "Windows ZIP file for non admin install". To get the right tools it's necessary to download the Arduino IDE version 1.0.6. The latest version of the Arduino IDE when I made this video does not contain the tools that we need. And this is where it's getting interesting. Next thing to do is to build a 20MHz bootloader. A schematic can be found in the datasheet of the ATmega328P. Connect the crystal an capacitors like I have done here. The outer pads are the connection for the crystal. I'll put a link to this document in the description.įirst thing to do is to remove the 16MHz resonator and the 1 meg-ohm resistor on the board.Īfter that there are tree pads available. The load capacitance can be found in the datasheet of the crystal.ĭetailed information and calculations about the load capacitance can be found in the AVR042 application note. Make sure that the crystal has a load capacitance of 18pF to get it to run reliable with the 22pF capacitors. You can't use any 20MHz crystal that you can get your hands on. Just to get a little more processing power for your projects.įor this tutorial you need an Arduino Uno or clone, an Arduino Uno as ISP programmer, a 20MHz crystal and two 22pico farad ceramic capacitors. ![]() Yes, the microcontroller on the Arduino Uno, the ATMega328P, can safely run at 20MHz as you can see here in the datasheet. I will also explain the process of building a 20MHz bootloader and how to upload this bootloader to the 20MHz Arduino Uno.Īnd for those who missed it, the ATmega328P is not the same anymore since the beginning of 2016. In this video I will explain how to build a 20MHz Arduino Uno. Hello and welcome to another one of my videos. This page contains the full script that I used for making this video. The 20MHz Arduino Uno and bootloader tutorial. Video: The 20MHz Arduino Uno and bootloader tutorial.
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