First, the “programmer-Arduino” (the Arduino that you have configured as a programmer) must be configured as an ISP. The sketch (code) is by default available in example code within the File menu of ...

This project implements an Atmel In System Programmer (ISP) programmer using only a low cost (≈$5-$17) Pro Micro (Sparkfun DEV-12640 or equivalent clone) (or Leonardo) module with an ATMega32U4 ...

This sketch can be used to let one Arduino program a sketch or bootloader into another one, using the ISP programming pins. This sketch is based on OptiLoader, but modified for use with Adafruit's ...

On the other hand if you already have the Arduino, fetch the avr.isp.03 firmware and AVRdude. Then program a device, for example an ATtiny13 using the Ardunio as the programmer.

The tutorial is fairly straightforward, and even demonstrates how the Arduino can be used as an ISP for the ATtiny, removing the need to purchase a standalone programmer.

This Arduino ICSP programmer has been made from Alumide, a strong plastic with aluminum fibers. The cover is made from translucent POM, illuminated by three rings of in total 27 LEDs.