hello everybody ,

i have a problem programming "pic18f4550" , am now working on laptop
and its not have r s232 port , so my old and lovely jdm programmer cant
work anymore , now i need to program it using usb port , any one know
where to find it , but like befor i want to build it , i found one but it use
max662 + pic18f2550 , and here in my country i dont have max662 . so
any one can help me to build it . thanks

note : i have 2 pic18f4550 and i want to use 1 to program the other .

regards .

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jax

 

Try gtp usb or brenner8, to download schematic, search posting with keyword gtp usb

Thanks

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http://www.henryelectronics.com

 

Search the Microchip website for the “PICDEM FS USB DEMO BOARD” that uses that chip. You can download a schematic and software for that board. The demo software will let you program the chip with your HEX file. They used Borland C for the PC end of the demo but I was able to find a Visual C++ translation of it on their Microchip forum.
This page has the demo software
Downloads and Related Application Notes:
MCHPFSUSB_Setup_v1.2.exe

MCHPFSUSB v1.2 Release Notes

MCHPFSUSB User’s Guide

AN956:

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C:\WHUT ?
Beware the asterisk *

 

The Junebug is a PICkit 2 compatible USB programmer / debugger. The schematic is on my site in the Junebug assembly manual.
IMO it's as easy to build as the brenner 8 and does much much more too.

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

I don't know if anyone tried using PIC18F4550 on a 18F2550 mode, and download the PICKit2 code, you should be able to make a working PICKit2 unit quickly.

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F.N.

 

Blueroom don't you worry about publishing all your schematics for all to use?

 

Enjoy, just give me credit for them. After all I "borrowed" the design for the Junebug (programmer part only) from the PICkit2 manual. And the Inchworm was based on Eric Stolz's design. The Unicorn was based on the ones on the ICD2CLONE.COM site. Of coure I always add my touch to them.

Lots of people appear to have built Junebug copies based on the schematic, same with the Inchworm.

I don't publish the PCB layouts, those belong to me

The Junebug prototype (yes it works and uses a 18F4550 as I didn't have any 16F2550s on hand)

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Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

well i'll come clean then, i'm building an inchworm+ cause i've heard so much good about it. i must admit i wasn't very happy when it wouldn't communicate with mplab, all the components checked out, as did the circuit, the serial cable was the one i used for other projects, but then i don't use the handshaking lines. guess what comes next.
in anticipation of completion thanks for the design and work put in.
perhaps you could keep your firmware secret and protected to put off freeloaders [ahem]? we would at least have to buy the pic from you..

 

Once again the firmware for the PICkit2 & ICD2 is part of MPLAB Not mine at all.

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Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

Hi Bill,
Do you pay for using the firmware and cloning Microchip's product? Just wondering

The Junebug prototype (yes it works and uses a 18F4550 as I didn't have any 16F2550s on hand)
18F2550 huh

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Superman returns..

 

No, it's an unlicensed product. They are also not listed as clones but compatibles.

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

OIC, thanks
Is it something like this:
Clone: Same design
Compatible: Similar design

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Superman returns..

 

That's how I see it. I've removed the 3.3V buffers to keep the kit simple and the cost down.

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com