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Turn Your Arduino Into an ISP




Learn how to turn your Arduino into an AVR In System Programmer. This will allow you to burn bootloaders onto new chips or program AVRs without a bootloader.

Step 1: Materials

To begin you will need:
* Arduino (I will be using the Uno)
* AVR Microcontroller (This tutorial will cover the ATtiny85 & ATmega644)
* Arduino IDE
* Breadboard
* Jumpers
Arduino

Step 2: Setup

Before we begin programming chips we must set up the Arduino. First, make sure your Arduino IDE is up to date. Then select the File >> Examples >> ArduinoISP sketch and upload it to your Arduino. Now your Arduino is now an AVR ISP.

Step 3 Using Your Arduino ISP: Programming AVRs Without Bootloaders

There are a few instances in which it is neccesary to program microcontrollers without a bootloader. For example, if have run out of storage on a chip you can get an additional 2KB when you program without a bootloader. Another example, the one I will show you how to do, is to program chips that have no serial capabilities and therefore cannot use a bootloader. The ATtiny85 is one of these chips.

To program the ATtiny85 using the Arduino ISP you must first add ATtiny85 support to the Arduino environment:
* Download attiny45_85.zip
* Unzip the folder
* Copy the folder to the Arduino IDE’s Hardware folder
* Reopen the Arduino IDE, you should see the ATtiny85 in the Tools >> Board menu

Now connect your Arduino ISP to the ATtiny85 like the diagram below.

Open the Blink sketch, change every ’13’ to ‘0’, select ATtiny85 from the Tools >> Board menu, and select the serial port that is your Arduino ISP. Now click on upload and your ATtiny will begin blinking the LED once it’s done.

For more details, click: Turn Your Arduino Into an ISP

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