Reading between the lines, one often overlooked detail in using the 18F2550
/ 18F4550 is a capacitor on Vusb pin on the chip.  There's sort of an
off-handed comment in the data sheet about this but it's easy to overlook.
Connect 0.47 uF between this pin and ground.

I purchased a demo board for a temperature sensor (MCP9800 Temp sensor demo
brd)  from MC that has an 18F2550 on it.  Connected it to a USB port and
nothing happened.  Based on my previous experiences, I soldered the cap in
and it was immediately recognized.  I was surprised that a board that's been
in production for a couple years would have a problem like this,

Jon


On Sun, Feb 14, 2010 at 12:17 PM, Tobias Strassen <killaweb@gmx.net> wrote:

>    hi piclist.
> im building 18f4550  USB pic to know what frameware
> (Microchip-software-stack) does not work "normally" in build like the
> Michochip Schematics... i have installed the USB windows driver.....but
> i do not see the "device" in windows ....so i want to use look "at the"
> USB port like programs do like REALTERM....here i could look especially
> the RS232C COM1 COMx port to an 18f877 --> RS232----PC--Realterm.  it
> looks perfektly.
> i want to do so on windows with look ->Protokoll USB <->PC  Connection...
> all messages welcome.
>
>
> --
> vielen dank
> tobi
>
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