Re: using breadboards

I've thought about that, but I'm not really sure that I have the expertees and 
time to get involved with something like that.
I am not even sure how to begin getting on the dev team.
My doubts are pretty high on them just letting some 18 year old blind dude 
still in high school code. :)
I know I have a lot to learn, I'm just trying to find out the best way to learn 
I'm not even picky about what it is, well to a point, anyway.

  ----- Original Message ----- 
  From: Ken Perry 
  To: programmingblind@xxxxxxxxxxxxx 
  Sent: Sunday, February 22, 2009 4:57 PM
  Subject: RE: using breadboards



  I think you again are barking up the wrong tree.  So you write your own 
shell.  (I have done this )  What then?  To make it useful you need 
applications for it.  You will have to write them all.  You would be better off 
getting involved in something like the Google Android operating system or OE 
Linux at the ground level.  If you do something like that you're in on the low 
level of both devices and software and you can make a large difference.  The 
Android operating system is made for all mobile devices so you could both start 
from scratch and get the support of a community.  The problem is in the past a 
lot of blind or disability companies have created things from scratch and when 
you are all done you end up with a  device that is so behind the times no one 
wants to use it.  Same goes for software you will spend more time making your 
shell interact with things that are out there because your users will want to 
chat with his friend on Msn or print her papers to that usb printer.  So look 
more into getting involved with things like OE Linux or Android or things of 
that sort and you will learn the same amount your thinking of while making a 
huge difference.




  From: programmingblind-bounce@xxxxxxxxxxxxx 
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Tyler Littlefield
  Sent: Sunday, February 22, 2009 5:40 PM
  To: programmingblind@xxxxxxxxxxxxx
  Subject: Re: using breadboards


  I graduate this may, I believe.

  Maybe I won't go that route. I'm interested in OS design, making something 

  I really want to just write a basic shell, though I doubt my OS will be the 
next windows on the market, I want to get things working.

  I started playing with something, but after I got it to boot up and 
everything I wasn't able to find a way to test what I wanted to see if it works.

  Basically I'm looking for another solution besides just windows and linux 
dev. I want to start playing with new technologies learning how things work, 
making things go bang, etc.

  Any other ideas would be great. I won't give up on learning about circuitry, 
but it's hardly a career option for me.


    ----- Original Message ----- 

    From: Ken Perry 

    To: programmingblind@xxxxxxxxxxxxx 

    Sent: Sunday, February 22, 2009 3:34 PM

    Subject: RE: using breadboards



    You are looking at the wrong place for making a PDA even if it was just for 
you personally.  I said 274 for the development board after you design the 
software on that and decide what components you want for example the 274$ 
development board I spoke of came with y-fi, 2 usb ports, blue tooth, and some 
other things like keyboard input which you would have to design.  Of course a 
finished product would not need all of those or it would be a Pac mate.  Anyway 
the thing is you buy one dev board and develop your PDA idea.  When you're done 
you get the company who made the dev board to make you 5000 of them and your 
off and running with the next Victor stream.  Now I am not talking from left 
field.  I would suggest you call Marc at Levelstar and talk to him.  He 
developed the brail plus and Icon hardware and he will be able to explain it 
much better when I was talking to him the other day he said and I quote, "you 
may think you want to get into hardware design but you don't believe me you 
don't."  You really need to talk to people already in the industry.


    I also know of another device that was a Linux pda that never made it to 
market because it took 6 months to get a bread board working for it because you 
have to match up the daughter boards and get all the polarities and voltages 
right and in this case it was a sighted person doing  it and he smoked a few 
components just getting it to work.  After that he had to get some kind of 
software to actually compile and work on it.  Why would you want to go through 
that kind of hell when you can purchase a development board from either Samsung 
or hell there are lots of companies that you can get atom dev boards from and I 
am not even sure my $274 is the lowest cost I did see one that was $1000 for a 
dev board and it was a 4 inch by 3 inch board that was pretty much a laptop in 
a  tiny box.  These dev boards come with an operating system that works on 
them, heck most of them come with both windows CE and Linux so you can choose  


    Shrug do what you want but the work you will have to put into a PDA is not 
worth it.  This is the last I will say, without any other questions,  because 
if you want to fight with it more power to you just know you are in for a long 
hard road to get nowhere and by the time you get there your device will be so 
far behind the times it won't be worth having.  For example if you are planning 
on making this for more than yourself it costs in around $2000 to $5000 just to 
get your power supply tested and passed all the regulations.  That's just one 
of the things you will have to do with your own design.


    By the way as a side note, Tylor when do you graduate from High school?  
This has nothing to do with what you're doing I am just interested.



    From: programmingblind-bounce@xxxxxxxxxxxxx 
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Tyler Littlefield
    Sent: Sunday, February 22, 2009 4:43 PM
    To: programmingblind@xxxxxxxxxxxxx
    Subject: Re: using breadboards


    I figured I was totally scrued up.

    It's just something I want to do.

    I have an idea for a PDA I would like to build that sounds fun, just my 
personal little PDA. I could totally customize it, and it would be cheaper than 
anything I could buy more than likely.

    I also want to just learn how these things work. I've often found them 

    I have been digging around for some electronics tutorials, but haven't 
found all that much that doesn't consist of a ton of pictures, etc etc.


      ----- Original Message ----- 

      From: The Elf 

      To: programmingblind@xxxxxxxxxxxxx 

      Sent: Sunday, February 22, 2009 2:34 PM

      Subject: Re: using breadboards


      lol, odd list to send this to, but I used to do modular electronics, so 
your in luck. 


      firstly, that setup will not do the job, you need to find a basic 
electronics tutorial and read it, smile, not ragging on you, just the truth.


      there are basic principles that you haven't grasped yet.


      for a battery charger, you need the 110 volt (wall) plug, a transformer,  
you need a full  wave rectifier (I'll explain in a minute) and you may want 
some filter capacitors, though there not really needed for a bat charger. 


      now then, your first mistake is that your setup would have put wall type 
current, called AC for alternating current, into resisters and batteries which 
are DC (direct current) devices , that's a large shocking flam buoy recipe.

      number two, you said resisters to bring the current down, yes resisters 
will drop current, but not in the way you need it to, this kind and type of 
current step down is done with a transformer (that's why so many things with 
removable wall plugs have that large box either at the wall end, or in the 
middle of the cord, the box is mostly the transformer that reduces the voltage 
and changes the amperage of the wall current. 

       and without the full or half wave bridge rectifier I mentioned before, 
your still plugging DC parts into an ac circuit, another flam buoy!

      the full wave bridge rectifier I have been mentioning is the component 
that changes the AC current coming out of the transformer into DC current for 
the batteries to charge off of.


      here is the correct series of components for a simple power supply:


      1. 110 volt power plug, which you attach to a specific set of contacts on 
a 110 AC to... (output voltage equals the number of batteries going into the 
battery holder, times 1.5 volts) so if you have a battery clip for 2 batteries, 
then its 3 volts, if its four then it's six volts) AC transformer (note here, 
all the transformer does is change the voltage and amperage of the power, not 
its type, at this point you still have AC current running through the thing).

      3. to the output side of the transformer you attach the input leads off 
the  full wave bridge rectifier (this is the device that changes the power from 
AC, to DC so its the same type of current as your batteries).

      4. to the output side of the FWBR you can either: 

      4-1. insert two filter capacitors to screen out noise the circuitry 
generates, but this is not needed in a simple charger(*note,! the filter 
capacitors have to be hooked up the correct way, one end is positive one 


      4-2. attach your battery holder, making sure you get the polarity of the 
wires correct to the battery holder , or your making a loud bang and a lot of 
stink and a hazard out of your batteries.


        another point, this simple setup has no way, like many chargers you buy 
do now a days, to tell when the batteries are fully charged, and stop trying to 
charge them, and this will heat up, and eventually give you another ka boom.


        the circuitry for a regulator is not to hard, but I can't pull it out 
of my head like I can a simple power supply. 


        that is the basics of a power supply and it will work as a charger. and 
it will not cost much, but why reinvent the wheel, unless your going to try for 
some work in the electronics field? which I would not advise, some of the stuff 
is extremely complex, and some of it quite delicate, and none of it is marked 
in a method that can be  read with our current tech abilities. 




        ----- Original Message ----- 

        From: Tyler Littlefield 

        To: programmingblind@xxxxxxxxxxxxx 

        Sent: Sunday, February 22, 2009 12:06 PM

        Subject: using breadboards



        I'm looking to start using breadboards to create some small things.

        I'd like to start off with something small, possibly a battery charger 
or something similar.

        I found a small tutorial on instructables, but not totally sure how to 
get going.

        It explained how things work somewhat, but not accurately enough for me.

        It mainly used pictures to explain, which didn't do me a whole lot of 

        Any ideas on how I can set this up?

        I understand the polarity--hooking one negative end to the positive etc 
so that the circuit forms a loop, I'm just not sure how to do what I want.

        So, here's my idea.

        If I figure out the layout, I can set up a power cable going from the 
outlet to the breadboard.

        Then I can place in jumpers to bridge the gap.

        I can take the 120 volts down to 9 with some resisters (?) and hook a 
battery pack to the other end that will charge the batteries.

        I'm thinking I'm way off, but... ideas would be great.

        If I could, I'd like to set it up so it'd charge like 4 at once, then I 
could cut down the 120 to 36. Possibly put in a heat sink to keep it from 
getting really hot.


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