Atmega328P-PU with bootloader installed with quarter
Atmega328P-PU with bootloader installedAtmega328P-PU with bootloader installed on black

Virtuabotix ATMEGA328P-PU Optiboot Arduino Uno Bootloader (Retired)

$3.65

So if you are looking at this product you probably fried your Arduino Uno. Don’t feel bad, it happens to the best of us. We have taken the time to put the Uno bootloader on these bad guys, so if you need to replace or upgrade your chip it will be a snap! Of course don’t forget you don’t actually need an Arduino to use this chip. This is a standard ATMEGA328 AVR compatible chip.

These handy and robust Atmel chips come ready to help you take on the world, and no Arduino fanatic should be found without a spare or two. If you wanted to try your hand at some really geeky stuff you can even build an Arduino Compatible breadboard controller with our Bareduino kits.

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Product Description

Package Contents


Virtuabotix ATMEGA328P-PU Optiboot Arduino Uno Bootloader


ATMEGA328P-PU Pin-out for Arduino Uno Bootloader & Chip

Technical Specifications



Clock speed: up to 20 MHz Clock Speed (16 MHz Recomended)

Memory: Flash 32 KB | EEPROM 1 KB |SRAM 2 KB

Pins: Digital I/O Pins 14

Analog input Pins: 6

PWM (Pulse Width Modulation): 6 pins

What is a bootloader?
A bootloader is to a microcontroller what an operating system is to a computer. The Arduino Bootloader provides start up services, and is what allows the chip to be programmed through the serial port, since normally you must program an Atmel chip using a SPI programmer.

The Arduino Uno bootloader is virtually identical to the Arduino Duemilanove bootloader, except for some minor changes to program UART baud rate, and start up order. Because of that anything written for the Arduino Duemilanove can be run on the Arduino Uno.

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