justDIY
Active Member
this is something I whipped up last night, a basic experimenter module for a 28 pin USB enabled pic, the 18F2550.
the board is very spartan, it contains usb connector, a few leds, reset and boot switch (as per microchip's usb bootloader spec), and pads for an inexpensive smt crystal series (avail in most common clock speeds).
one thing I'm not sure on yet is the usb connector itself. since this layout is on the top side of the pcb, the connector will cover the pads it needs to be soldered to. I'm thinking I'll swap the through-hole connector for an smt version, which will more or less have its leads exposed.
I would appreciate any on-topic thoughts and feedback from the community.
board layout:
**broken link removed**
schematic:
https://projects.dimension-x.net/pictures/usb/28pin_simple1_sch.png
the board is very spartan, it contains usb connector, a few leds, reset and boot switch (as per microchip's usb bootloader spec), and pads for an inexpensive smt crystal series (avail in most common clock speeds).
one thing I'm not sure on yet is the usb connector itself. since this layout is on the top side of the pcb, the connector will cover the pads it needs to be soldered to. I'm thinking I'll swap the through-hole connector for an smt version, which will more or less have its leads exposed.
I would appreciate any on-topic thoughts and feedback from the community.
board layout:
**broken link removed**
schematic:
https://projects.dimension-x.net/pictures/usb/28pin_simple1_sch.png