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====== Burning the Arduino bootloader with PA-328d ======
The following was tested with Arduino 1.8.5.

You'll need:
  * A 5V USBtiny-compatible AVR programmer similar to [[https://www.ebay.com/itm/USBTiny-USBtinyISP-AVR-ISP-programmer-for-Arduino-bootloader-Meag2560-uno-r3/222309741667?epid=2133920222&hash=item33c2b17463:g:z2gAAOSwo4pYI0WC|this one]]. The [[https://www.adafruit.com/product/46|Adafruit USBtiny]] should work too but isn't tested.
  * A tabbed 6-pin IDC cable. One typically comes packaged with the USBtiny-compatible board.
  * A populated [[https://gitlab.com/mithat/Arduino-programming-board|PA-328d]] PCB.
  * One or more ATMEGA328P-PU ICs that you want to burn the Arduino bootloader onto.

===== Configure the USBtiny-compatible =====
{{:arduino:pa_328d:usbtiny-config.jpg?direct|}}

  * Make sure the jumper in the upper left corner is installed.
  * Plug the tabbed 6-pin IDC cable into the receptacle.

===== Configure the PA-328d =====
{{:arduino:pa_328d:pa-328d-config.jpg?direct|}}

  * Plug the tabbed 6-pin IDC cable into the ICSP receptacle.

===== Configure the Arduino IDE =====
{{:arduino:pa_328d:tools-menu-config.png?direct|}}

  - Under //Tools > Board: // select //Arduino/Genuino Uno//.
  - Under //Tools > Programmer: // select //USBtinyISP//.

It doesn't matter if a sketch is loaded in the editor.

===== Burning the bootloader =====
Plug the USBtiny compatible in to your computer via USB. Then for each ATMEGA328P-PU you want to burn the bootloader onto:

  - Insert the ATMEGA328P-PU into the ZIF socket and lock the latch.
  - In the IDE, select //Tools > Burn Bootloader// and wait a few seconds for the process to complete. 
  - Unlock the ZIF socket and remove the ATMEGA328P-PU.

Repeat the above as needed for additional ICs.