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Jaluino Medium improvements #25

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GoogleCodeExporter opened this issue Mar 15, 2015 · 5 comments
Closed

Jaluino Medium improvements #25

GoogleCodeExporter opened this issue Mar 15, 2015 · 5 comments
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auto-migrated Component-Mainboard Priority-Medium Type-Enhancement Usability

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@GoogleCodeExporter
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Here's a list of feedback to improve Jaluino Medium board:

Mike says:
"""
Put track to VSS, J7 and USB on top of board instead of skinny between pin. (I 
know you thinking of SS home etch, but even there a wire link better)
Have most of top of board ground plane for screen and better earth.
More copper at PSU socket. Track may crack there with use.
[...]
I'll not bother with fuse holder or bridge. Most wall warts will "die" before a 
78M05. Most PIC prototype PCBs have a smaller 78L05 set of pads too.
[...]
Having space for RS232 TX/RX IC and its capacitors (again two pin spacing by 
3rd hole) and a DB9 would be more useful IMO than large space for fuse. There 
are small cheap resistor size fuses (pico fuse) etc than can go in a couple of 
turn pin IC socket pin for those that want a fuse.
"""

Note: Richard already fixed the "more copper at PSU socket" in version 1.4, not 
in SVN yet IIRC.


Joep says:
"""
- the space used by the fuse is quite large. If you ask me, the fuse
could be removed all together, but if you want this protection,
consider a polyfuse, which is much smaller and restores itself
(http://www.voti.nl/winkel/catalog.html?Polyfuse-1A1) .
- The space that comes available for this, could be used to put the
7805 flat and - if you can - keep some room for a cooling body.
- Put in an alternative for C6 for the same value and size as C12
(pins closer together). C6 only needs to be this large if you have an
AC power supply and otherwise, a smaller value can be used and reduces
the number of different parts required.
- C5 and C10 are 220nF, which are much less-common then 100nF. Do they
need to be 220nF? (I guess C5 is, but I am not sure about C10). Would
it be a good idea to create the option for 2x100nF parallel?
- Give R1 and R4 same value (makes no difference for the application,
but easier when collecting components).
- Most but not all products are available at voti.nl. Maybe there is
an other supplier that has them all (and supplies them at a reasonable
rate world-wide). If not, ask Wouter to add the missing components
(3v3 regulator, fuse, maybe power connector) when we start a new
batch.
- On the silk screen, the pin names upside down (I'd say rc4 is good,
re2 is upside down) - set all text in the same direction.
- the pin names mentions should be on the outside of the connector
(like Vin etc), so you can still read them with a shield installed.
- the meaning of the jumpers would be useful. This is not on this
print, but it is on the board shown on justanotherlanguage.org... Same
applies for 'reset' function of sw2.

As an option: add a led that can be controlled by the processor. Place
it between the reset button and he usb connector so it is visible with
a board installed. Use a jumper to connect it to RE2.
"""


Sunish says:
"""
I would like to add an LED on board, with resitor to have a quick check.
Also why was lm 317 idea dropped for 3.3 v supply ? Its pretty easy to source 
than any other 3.3 regulator. I would have liked a max 232 on board too..
"""


Feel free to add more in this issue

Original issue reported on code.google.com by sebastie...@gmail.com on 10 Jul 2010 at 8:18
@GoogleCodeExporter
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Sunish also says:
"""
Why not add more power pins ? may be near each 8 pin connector ? That would aid 
in powering any peripheral boards.

[...] another idea is to have diode and jumper for powering the PIC through a 
diode with a battery. Timer1 oscillator pins are readily available for 
connecting a 32khz crystal and replacing the fuse with a diode would provide 
power mains power to the PIC. 
"""

Original comment by sebastie...@gmail.com on 16 Jul 2010 at 3:28

@GoogleCodeExporter
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Not the least, Anonymous commented Jaluino main page 
(http://justanotherlanguage.org/content/jaluino) and says:
"""
The biggest problem with Jaluino being "accepted" or even "popular" is 
availability. At the moment there are no Jaluino boards available commercially 
or otherwise unless you make your own which is a significant barrier for most 
people.

Additionally, there is now another board designed to achieve the same thing, 
the Amicus, which is commercially available from several sources. It came after 
this project, but has now overtaken it simply because it is available "now".
"""

(I'm not Amicus is younger than Jaluino)

then, later, Anonymous adds:
"""
I saw that 16 boarsd had been made and snapped up pretty quickly.
[about improving Jaluino], the issue log didn't include any actual showstoppers 
from what i could see. Just "nice to haves". It works as is. Not saying you 
shouldn't improve it, these sorts of projects tend to be iterative affairs. The 
price of being an early adopter is that you may want (need?) to buy version 2 
or 3 :)

I would give serious consideration to Seeedstudio as a vendor who will handle 
production and shipping though I note they generally require a $US 200 deposit. 
Failing that, their batch PCB service might eb the way to go. Either option 
would relieve you (or someine else) from having to deal with payments and 
shipping etc.

Just my 2c worth. If Jaluino had been available from Seeed, I would have bought 
one by now... I seem to be averaging an order a month from them :)
"""

Let's think about this...

Original comment by sebastie...@gmail.com on 16 Jul 2010 at 7:01

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Joep suggests:
"""
Since computers with serial ports are getting rare, 'usb serial' takes
over. First of course with db9, but what's the point in raising ttl to
rs232, pass it via a db9 where it is transformed back to ttl again? I
guess the easy way is to put an ftdi chip on your board like arduino
does and the cheap way is to put a ttl-serial header on every board
and buy one 'ftdi cable'.

[...]

If it is the ftdi chip that you want, take an 'ftdi cable'
http://www.ftdichip.com/Products/EvaluationKits/TTL-232R.htm
As i suggested before, change the jaluino serial connector pinout to
match this cable is a good idea in any case.
"""

This sounds a good idea :)

Original comment by sebastie...@gmail.com on 26 Jul 2010 at 8:16

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I still think that on a future 18F26K22/18F46K22 Jaluino board, the FTDI chip 
must come pre-soldered on the board...
Yes, a testing LED is useful and I think the LM7805 regulator must have enough 
room for an adequate cooling radiator. By example, using the board in a RE 
environment, connected to a battery of 12V/350Ah, the regulator get very hot 
for just running a digit and three LED's. On my board is impossible to put a 
cooling radiator (I will loose the LM7805) but on Jaluino is just fine.

Original comment by funl...@gmail.com on 27 Jul 2010 at 12:57

@GoogleCodeExporter
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Jaluino Medium v2.0 is improving many of what described here. This page 
explains in details:

    http://www.justanotherlanguage.org/content/jaluino/shop/batch/2

Considering this issue closed.

Original comment by sebastie...@gmail.com on 28 Nov 2010 at 10:36

  • Changed state: Fixed

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