Editing Flashing bootloaders on AVR (section)

== AVR ISP Programmer ==

That's the device that will sit between your ATMEL chip and PC. There's really a plethora of options; but for a one-time rescue effort an Arduino is an option. Dedicated Programmers generally come already &quot;working&quot;, i.e. you would just plug them into PC, connect to your ATMEL chip, and use avrdude to program the ATMEL chip.

However if we'll be using an Arduino, we need to program the Arduino so that it will behave like a Programmer. The easiest way to achieve that is to run the Arduino GUI, select &quot;File &gt; Examples &gt; ArduinoISP&quot;, compile and program the sketch into your Arduino. That's all good, but there may be a couple of snags that you encounter when you try using it; most notably you'll need a 10uF capacitor between RESET and GND on Uno (see [https://www.arduino.cc/en/Tutorial/ArduinoISP here]); and you'll need to edit the sketch a bit for a Leonardo or a Teensy; and finally the pins on the arduino where your ATMEL chip should be are different than Uno's (for these two see [https://petervanhoyweghen.wordpress.com/2012/09/16/arduinoisp-on-the-leonardo/ here]). Using Teensy is most painless, you can use the diagrams [http://dorkbotpdx.org/wiki/teensy_2_0_as_avr_isp_programmer here] to figure out which pins to use.