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PIC18F2550 / PIC18F25K50 board

Posted: Thu Nov 10, 2016 12:37 am
by octal
I built and assembled a small prototyping board for PIC18F2550/PIC18F25K50. The PCB has been produced by SeeedStudio (excellent results), and I assembled first prototype by hand (quickly).
The board can be plugged directly on a breadboard, can be programmed using any PIC programmer via the 5 pin header.
Almost all pins are exposed, and I added two jumpers to make it possible to physically connect/disconnect two LEDs on PIC pins.
Another jumper provide the possibility to pull-down one pin in order to trigger the USB bootloader (if you prefer avoid an external programmer).

I didn't assembled the crystal on my board because I'm trying PIC18F25K50, and I want to check the possibility to do USB using internal crystal only.
I'll post the whole project, schematics and gerbers, and example souce codes (using Microchip C, Swordfish Basic) in few days.

Here some photos of the board

Re: PIC18F2550 / PIC18F25K50 board

Posted: Thu Nov 10, 2016 9:14 am
by David Barker
I look forward to seeing the code you come up with...

Re: PIC18F2550 / PIC18F25K50 board

Posted: Thu Nov 10, 2016 10:49 am
by Jerry Messina
Nice little board octal.
I want to check the possibility to do USB using internal crystal only
I have the 45K50 running USB with SF using the internal osc. The chip has Active Clock Tuning (ACT) which is supposed to keep it to +/-0.2% over the full temperature range.

So far, it seems to work ok.