On Wed, 11 Jun 2008 09:39:06 +0300, Pertti Kellom�ki
<pertti.kellomaki@tut.fi> wrote:
>Tim Wescott wrote:
>> If you have enough undedicated pins, hook up one switch per pin (view
>> with a fixed-width font):
>[Schematics of pull-up resistor and switch]
>
>Just an addition to Tim's post. I don't know about the MSP430F2013
>specifically, but many microcontrollers already have the resistor
>internally on some of the pins.
Many do, though the pull-up may be a bit weak.
>All you need to do is enable it somehow.
>On AVRs it is done by writing to a port configured as inputs, but I'm
>sure each manufacturer has some unique, equally wacky way to do it.
Some even have several ways to enable the same thing, in fact. ;)
>So before you warm up your solder iron, it might pay to check out
>the data sheet carefully.
Always good advice!
Jon
Reply by ●June 11, 20082008-06-11
Tim Wescott wrote:
> If you have enough undedicated pins, hook up one switch per pin (view
> with a fixed-width font):
[Schematics of pull-up resistor and switch]
Just an addition to Tim's post. I don't know about the MSP430F2013
specifically, but many microcontrollers already have the resistor
internally on some of the pins. All you need to do is enable it somehow.
On AVRs it is done by writing to a port configured as inputs, but I'm
sure each manufacturer has some unique, equally wacky way to do it.
So before you warm up your solder iron, it might pay to check out
the data sheet carefully.
--
Pertti
Reply by Jonathan Kirwan●June 10, 20082008-06-10
On Mon, 9 Jun 2008 10:59:54 -0700 (PDT), anmol <anmolanand@gmail.com>
wrote:
>I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
>the buttons for input with a software . Please help and tell me how
>to go about the task . If you have any tutorial , curcuit diagrams ,
>videos please give the download location or the url of the site .
If you can get the EZ430-F2013 ($20 last I checked without a coupon
discount), you might already have most of what you'd need not only to
write code and program the device but also to wire in your switches as
Tim suggested. It plugs into a USB port on your computer and can use
the IAR Kickstart IDE and compiler for programming in assembly, c, or
c++ or some combination of those. There are some through-holes inside
the tiny device and a small open rectangle in the side for bringing
out signal wires for your switches and a ground/Vcc that you might
take advantage of to get started quickly. The unit includes a small
green LED inside the case, as well, that you can use for blinking or
some other indicator as you may want.
If that device isn't inappropriate for your needs, I can provide a
small tutorial set of programs I wrote to get you started using the
device, but they do NOT deal with switches. They are written in c and
intended to let you learn about controlling the LED in various ways.
But they do get you learning about controlling the CPU speed and using
the timer. Which may help in its own way.
...
Separately, depending on how you intend using switches and what kinds
of external components you are willing to include, you can also
consider learning about various topologies in wiring up switches. Tim
wisely held to the simplest and most independent approach -- a switch
and a pull-up resistor -- but there are other methods you can also
consider if the number of switches grows and the number of I/O pins
available is constrained. The whole subject of switches, push button
and otherwise, and microcontrollers is a very interesting one in its
own right and a very good one to use in learning about micros,
software, and various hardware design approaches for user input via
buttons. Debouncing is an very important part, but it's not the only
interesting aspect. Enjoy it, fully.
Jon
Reply by anmol●June 10, 20082008-06-10
On Jun 10, 10:20 pm, Tim Wescott <t...@seemywebsite.com> wrote:
> anmol wrote:
> > On Jun 9, 11:31 pm, Tauno Voipio <tauno.voi...@INVALIDiki.fi> wrote:
> >> anmol wrote:
> >>> Hi!
> >>> I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
> >>> the buttons for input with a software . Please help and tell me how
> >>> to go about the task . If you have any tutorial , curcuit diagrams ,
> >>> videos please give the download location or the url of the site .
> >>> Regards
> >>> Anmol
> >> Study project - homework?
>
> >> --
>
> >> Tauno Voipio
>
> > It's a project but not a school or college project . Please help me in
> > connecting the buttons with MCU for input to software .
>
> > Thanks
> > Anmol
>
> Your question just _sounded_ so much like an end-of-year "do my work for
> me" sort of question...
>
> If you have enough undedicated pins, hook up one switch per pin (view
> with a fixed-width font):
>
> VCC
> +
> |
> |
> .-.
> | |
> | |
> to '-'
> processor |
> o------------o
> |
> o |
> |-
> o |
> |
> |
> ===
> GND
> (created by AACircuit v1.28.6 beta 04/19/05www.tech-chat.de)
>
> This circuit will read as a '1' on the input pin's bit when the switch
> is open, and '0' when it is closed. It will also introduce you to the
> wonderful world of switch bounce, which you can find out about via web
> searches.
>
> There are a lot of ways to deal with switch bounce in software, but
> basically you need to read the switch, then _make sure_ that it has
> finished deciding whether it's a '1' or a '0' before you do anything
> with it. The best way for your application depends on your application,
> so I suggest you read up on the many ways to debounce switches before
> you choose which method to use.
>
> --
>
> Tim Wescott
> Wescott Design Serviceshttp://www.wescottdesign.com
>
> Do you need to implement control loops in software?
> "Applied Control Theory for Embedded Systems" gives you just what it says.
> See details athttp://www.wescottdesign.com/actfes/actfes.html
Sorry Tim if i sounded arrogant but i was not trying to sound in that
manner .
Thanks for the reply and also for correcting me as this one is my
first post in any of the groups .
Once again thanks for taking out time and writing a reply :)
Reply by anmol●June 10, 20082008-06-10
On Jun 10, 10:20 pm, Tim Wescott <t...@seemywebsite.com> wrote:
> anmol wrote:
> > On Jun 9, 11:31 pm, Tauno Voipio <tauno.voi...@INVALIDiki.fi> wrote:
> >> anmol wrote:
> >>> Hi!
> >>> I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
> >>> the buttons for input with a software . Please help and tell me how
> >>> to go about the task . If you have any tutorial , curcuit diagrams ,
> >>> videos please give the download location or the url of the site .
> >>> Regards
> >>> Anmol
> >> Study project - homework?
>
> >> --
>
> >> Tauno Voipio
>
> > It's a project but not a school or college project . Please help me in
> > connecting the buttons with MCU for input to software .
>
> > Thanks
> > Anmol
>
> Your question just _sounded_ so much like an end-of-year "do my work for
> me" sort of question...
>
> If you have enough undedicated pins, hook up one switch per pin (view
> with a fixed-width font):
>
> VCC
> +
> |
> |
> .-.
> | |
> | |
> to '-'
> processor |
> o------------o
> |
> o |
> |-
> o |
> |
> |
> ===
> GND
> (created by AACircuit v1.28.6 beta 04/19/05www.tech-chat.de)
>
> This circuit will read as a '1' on the input pin's bit when the switch
> is open, and '0' when it is closed. It will also introduce you to the
> wonderful world of switch bounce, which you can find out about via web
> searches.
>
> There are a lot of ways to deal with switch bounce in software, but
> basically you need to read the switch, then _make sure_ that it has
> finished deciding whether it's a '1' or a '0' before you do anything
> with it. The best way for your application depends on your application,
> so I suggest you read up on the many ways to debounce switches before
> you choose which method to use.
>
> --
>
> Tim Wescott
> Wescott Design Serviceshttp://www.wescottdesign.com
>
> Do you need to implement control loops in software?
> "Applied Control Theory for Embedded Systems" gives you just what it says.
> See details athttp://www.wescottdesign.com/actfes/actfes.html
Sorry Tim if i sounded arrogant but i was trying to sound that .
Thanks for the reply and also for correcting me as this one is my
first post in any of the groups .
Once again thanks for taking out time and writing a reply :)
Reply by Tim Wescott●June 10, 20082008-06-10
anmol wrote:
> On Jun 9, 11:31 pm, Tauno Voipio <tauno.voi...@INVALIDiki.fi> wrote:
>> anmol wrote:
>>> Hi!
>>> I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
>>> the buttons for input with a software . Please help and tell me how
>>> to go about the task . If you have any tutorial , curcuit diagrams ,
>>> videos please give the download location or the url of the site .
>>> Regards
>>> Anmol
>> Study project - homework?
>>
>> --
>>
>> Tauno Voipio
>
> It's a project but not a school or college project . Please help me in
> connecting the buttons with MCU for input to software .
>
> Thanks
> Anmol
Your question just _sounded_ so much like an end-of-year "do my work for
me" sort of question...
If you have enough undedicated pins, hook up one switch per pin (view
with a fixed-width font):
VCC
+
|
|
.-.
| |
| |
to '-'
processor |
o------------o
|
o |
|-
o |
|
|
===
GND
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)
This circuit will read as a '1' on the input pin's bit when the switch
is open, and '0' when it is closed. It will also introduce you to the
wonderful world of switch bounce, which you can find out about via web
searches.
There are a lot of ways to deal with switch bounce in software, but
basically you need to read the switch, then _make sure_ that it has
finished deciding whether it's a '1' or a '0' before you do anything
with it. The best way for your application depends on your application,
so I suggest you read up on the many ways to debounce switches before
you choose which method to use.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
Reply by Leon●June 10, 20082008-06-10
On 10 Jun, 04:24, anmol <anmolan...@gmail.com> wrote:
> On Jun 9, 11:31 pm, Tauno Voipio <tauno.voi...@INVALIDiki.fi> wrote:
>
> > anmol wrote:
> > > Hi!
> > > I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
> > > the buttons for input =A0with a software . Please help and tell me how=
> > > to go about the task . If you have any tutorial , curcuit diagrams ,
> > > videos =A0please give the download location or the url of the site .
>
> > > Regards
> > > Anmol
>
> > Study project - homework?
>
> > --
>
> > Tauno Voipio
>
> It's a project but not a school or college project . Please help me in
> connecting the buttons with MCU for input to software .
>
> Thanks
> Anmol
Everything you need is in the data sheet and the User's Guide. You'll
also find plenty of application information on the TI web site. If you
are really stuck, try the MSP430 Yahoo group.
Leon
Reply by anmol●June 10, 20082008-06-10
On Jun 9, 11:31 pm, Tauno Voipio <tauno.voi...@INVALIDiki.fi> wrote:
> anmol wrote:
> > Hi!
> > I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
> > the buttons for input with a software . Please help and tell me how
> > to go about the task . If you have any tutorial , curcuit diagrams ,
> > videos please give the download location or the url of the site .
>
> > Regards
> > Anmol
>
> Study project - homework?
>
> --
>
> Tauno Voipio
It's a project but not a school or college project . Please help me in
connecting the buttons with MCU for input to software .
Thanks
Anmol
Reply by Tauno Voipio●June 9, 20082008-06-09
anmol wrote:
> Hi!
> I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
> the buttons for input with a software . Please help and tell me how
> to go about the task . If you have any tutorial , curcuit diagrams ,
> videos please give the download location or the url of the site .
>
> Regards
> Anmol
Study project - homework?
--
Tauno Voipio
Reply by anmol●June 9, 20082008-06-09
Hi!
I want to connect 5 buttons with the MSP430F2013 MCU . I want to use
the buttons for input with a software . Please help and tell me how
to go about the task . If you have any tutorial , curcuit diagrams ,
videos please give the download location or the url of the site .
Regards
Anmol