Junebug Assembly Tips - Page 12 - Electronic Circuits Projects Diagrams Free

the_scavenger · 8th February 2008, 12:02 AM

Hi, guys!

I've made a Junebug (just the programmer & debugger part) on a test board. Used a modified JDM to write PK2V021000.hex in the pic18f2550, but I still get "USB device not recognized" message when I plug it on my PC..

Measured 5V on U5V, and 3.3V over the 0.47uF capacitor. If I press the bootloader switch the red led blinks: I guess the oscillator is running, so is the firmware inside. Maybe some configuration bit was set wrong (but how!)?

I overchecked the connexions and it appears to be ok.

What should I do? :|

blueroomelectronics · 8th February 2008, 12:48 AM

On an early version of the schematic the USB D+ and D- lines were swapped. Try reversing them. They are correct on the PCB and the current Junebug manual.

the_scavenger · 9th February 2008, 01:16 AM

Yes, you're right, the D+ and D- pins were swapped (because I didnt't verify this in the pic's datasheet..). Thanks, Bill!

My Junebug it's not the best looking one, but is small and it fits in a 7x4 (cm) plastic box. Now it seems to work fine (it passed the troubleshooting test in Pickit2). I just need to build a test board for it (maybe Unicorn ?).

I'll attach a picture of it (while it is connected and running

):

blueroomelectronics · 9th February 2008, 07:39 PM

Very nice, looks terrific. The Unicorn is a good choice if you want to work with LCDs or GLCDs.

August Treubig · 14th February 2008, 01:58 AM

This is my Junebug version of the PicKit2.

MyPicKit2.jpg

It is built on stripboard so it is kinda big but it works.

Pommie · 14th February 2008, 02:31 AM

Nice job August and the scavenger. You should also consider adding (or building seperately) the tutor part. It makes trying out ideas so much quicker.

Mike.

August Treubig · 14th February 2008, 03:37 AM

Pommie,

Actually I built a Nigel sort of version that has a 18F1320 on it. I still need to build the I/O boards for it yet.

blueroomelectronics · 14th February 2008, 04:15 AM

Looks pretty neat August, my first prototype was point to point using 30guage Kynar.

**Nigel Goodwin** · 14th February 2008, 10:18 AM

Quote:

Originally Posted by blueroomelectronics

Looks pretty neat August, my first prototype was point to point using 30guage Kynar.

Looks nice from the top Bill, how about a picture of the bottom?

blueroomelectronics · 14th February 2008, 02:31 PM

Hmm, it's pretty natty but it works. Do you really want to see it?

mvs sarma · 14th February 2008, 02:39 PM

Quote:

Originally Posted by blueroomelectronics

Hmm, it's pretty natty but it works. Do you really want to see it?

I feel, Hand wiring will work reasonably well at these frequencies. Only when a data or port bus wiring is involved, that too at higher speeds are involved, perhaps path lengths matter. thus there also hand wiring might work, compared to difficulties of artwork routing restrictions.
At the outset, the component overlay has been really nice.

**Nigel Goodwin** · 14th February 2008, 03:12 PM

Quote:

Originally Posted by blueroomelectronics

Hmm, it's pretty natty but it works. Do you really want to see it?

Yes, be interesting to see - bear in mind a lot of mainframe computers were all hand wired.

parts-man73 · 11th May 2008, 05:00 PM

Just received my Junebug kit yesterday. One minor question on assembly.

Most pictures I have seen show L1 as a green large bodied inductor. resistor like in appearance.

I think I've narrowed down the list of possible suspects in my kit to a large black bodied inductor looks like a huge diode without a polarity stripe.

There is also a smaller one that I am assuming is FB1.

Brian

blueroomelectronics · 11th May 2008, 05:33 PM

The big one is the inductor, the small one is FB1 the ferrite bead.

parts-man73 · 11th May 2008, 06:41 PM

Quote:

Originally Posted by blueroomelectronics

The big one is the inductor, the small one is FB1 the ferrite bead.

Thank you for verifying my suspicions. I'd hate to have it soldered together to find out it was the other way round.

Now I have to break out the maginifying glass to figure out which transistors are which!

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8th February 2008, 12:02 AM	(permalink)
the_scavenger	Hi, guys! I've made a Junebug (just the programmer & debugger part) on a test board. Used a modified JDM to write PK2V021000.hex in the pic18f2550, but I still get "USB device not recognized" message when I plug it on my PC.. Measured 5V on U5V, and 3.3V over the 0.47uF capacitor. If I press the bootloader switch the red led blinks: I guess the oscillator is running, so is the firmware inside. Maybe some configuration bit was set wrong (but how!)? I overchecked the connexions and it appears to be ok. What should I do? :\|

8th February 2008, 12:48 AM	(permalink)
blueroomelectronics	On an early version of the schematic the USB D+ and D- lines were swapped. Try reversing them. They are correct on the PCB and the current Junebug manual. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com Last edited by blueroomelectronics; 8th February 2008 at 12:51 AM.

9th February 2008, 01:16 AM	(permalink)
the_scavenger	Yes, you're right, the D+ and D- pins were swapped (because I didnt't verify this in the pic's datasheet..). Thanks, Bill! My Junebug it's not the best looking one, but is small and it fits in a 7x4 (cm) plastic box. Now it seems to work fine (it passed the troubleshooting test in Pickit2). I just need to build a test board for it (maybe Unicorn ?). I'll attach a picture of it (while it is connected and running ):

9th February 2008, 07:39 PM	(permalink)
blueroomelectronics	Very nice, looks terrific. The Unicorn is a good choice if you want to work with LCDs or GLCDs. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

14th February 2008, 01:58 AM	(permalink)
August Treubig	My PicKit2 part of the Junebug This is my Junebug version of the PicKit2. MyPicKit2.jpg It is built on stripboard so it is kinda big but it works. __________________ August Treubig AG5AT

14th February 2008, 02:31 AM	(permalink)
Pommie	Nice job August and the scavenger. You should also consider adding (or building seperately) the tutor part. It makes trying out ideas so much quicker. Mike.

14th February 2008, 03:37 AM	(permalink)
August Treubig	Junebug meets Nigel Pommie, Actually I built a Nigel sort of version that has a 18F1320 on it. I still need to build the I/O boards for it yet. __________________ August Treubig AG5AT

14th February 2008, 04:15 AM	(permalink)
blueroomelectronics	Looks pretty neat August, my first prototype was point to point using 30guage Kynar. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

14th February 2008, 02:31 PM	(permalink)
blueroomelectronics	Hmm, it's pretty natty but it works. Do you really want to see it? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

11th May 2008, 05:00 PM	(permalink)
parts-man73	Just received my Junebug kit yesterday. One minor question on assembly. Most pictures I have seen show L1 as a green large bodied inductor. resistor like in appearance. I think I've narrowed down the list of possible suspects in my kit to a large black bodied inductor looks like a huge diode without a polarity stripe. There is also a smaller one that I am assuming is FB1. Brian

11th May 2008, 05:33 PM	(permalink)
blueroomelectronics	The big one is the inductor, the small one is FB1 the ferrite bead. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com