How to build a 21st century protection board

The process is the following:
- Writing the source code in a text editor;
- Compiling in Arduino programming environment;
- Uploading the compiled module to the chip.

The last step depends on the design we use. In earlier versions of the control board we used Arduino Nano - just uploaded via USB (FTDI) and plugged Nano into the control board. In the later versions ATMel chip is used separately, so it is plugged into Arduino Uno board first, the module is loaded normal way, and then we move the chip to the control board.
 
That is the weirdest thing. I searched several times with no luck. I first had a problem because the silk is wrong on the boards I have. The silk says HCLP2530. But, then I did a google search and the correct spelling showed up but still no joy with Mouser or Digikey. Now I find it on Digikey but Mouser's site is down so I will have to wait for them. I generally use Mouser when I can. Anyway, thanks for finding them for me, I will get them ordered today. I've been playing around with hybrids again so I want to finally get one mounted in a case so I will be needing one of these boards again.

Blessings, Terry
 
I have difficulties with this connector . This can't sit well here. Especially the next one
 

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