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Discussion Groups | M68HC11 | 68HC11 Project
Technical discussions about Freescale Microcontrollers: M68HC11. (Freescale Semiconductor is a Subsidiary of Motorola).
68HC11 Project - nilesfantasy - Nov 18 11:07:00 2005
I was wondering if anyone could suggest a simple project that could be
conducted on the Motorola 68HC11. We had originally thought of doing a
digital thermometer but another group has already proposed to doing
that. We were looking for something along those lines though. Any
suggestions would be greatly appreciated.
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
conducted on the Motorola 68HC11. We had originally thought of doing a
digital thermometer but another group has already proposed to doing
that. We were looking for something along those lines though. Any
suggestions would be greatly appreciated.
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - Huey Fen - Nov 18 11:40:00 2005
maybe you can try on design a voltmeter or maybe a calculator or what. Those are the
most commom students project topic.
nilesfantasy <nilesfantasy@nile...> wrote: I was wondering if anyone could suggest a simple project that could be
conducted on the Motorola 68HC11. We had originally thought of doing a
digital thermometer but another group has already proposed to doing
that. We were looking for something along those lines though. Any
suggestions would be greatly appreciated. SPONSORED LINKS
Freescale semiconductor inc Microcontrollers Pic microcontrollers 8051 microprocessor
---------------------------------
YAHOO! GROUPS LINKS ---------------------------------
---------------------------------
Yahoo! FareChase - Search multiple travel sites in one click.
[Non-text portions of this message have been removed]
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nilesfantasy <nilesfantasy@nile...> wrote: I was wondering if anyone could suggest a simple project that could be
conducted on the Motorola 68HC11. We had originally thought of doing a
digital thermometer but another group has already proposed to doing
that. We were looking for something along those lines though. Any
suggestions would be greatly appreciated. SPONSORED LINKS
Freescale semiconductor inc Microcontrollers Pic microcontrollers 8051 microprocessor
---------------------------------
YAHOO! GROUPS LINKS ---------------------------------
---------------------------------
Yahoo! FareChase - Search multiple travel sites in one click.
[Non-text portions of this message have been removed]
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RE: 68HC11 Project - Lennart Lindell KA/EAB - Nov 18 11:46:00 2005
Measurement of the speed of air.
Or other weather parameters.
-----Original Message-----
From: m68HC11@m68H... [mailto:m68HC11@m68H...]On Behalf
Of nilesfantasy
Sent: den 18 november 2005 16:07
To: m68HC11@m68H...
Subject: [m68HC11] 68HC11 Project I was wondering if anyone could suggest a simple project that could be
conducted on the Motorola 68HC11. We had originally thought of doing a
digital thermometer but another group has already proposed to doing
that. We were looking for something along those lines though. Any
suggestions would be greatly appreciated.
Yahoo! Groups Links
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Or other weather parameters.
-----Original Message-----
From: m68HC11@m68H... [mailto:m68HC11@m68H...]On Behalf
Of nilesfantasy
Sent: den 18 november 2005 16:07
To: m68HC11@m68H...
Subject: [m68HC11] 68HC11 Project I was wondering if anyone could suggest a simple project that could be
conducted on the Motorola 68HC11. We had originally thought of doing a
digital thermometer but another group has already proposed to doing
that. We were looking for something along those lines though. Any
suggestions would be greatly appreciated.
Yahoo! Groups Links
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - BobG...@... - Nov 18 11:53:00 2005
In a message dated 11/18/05 10:11:36 A.M. Eastern Standard Time,
nilesfantasy@nile... writes:
I was wondering if anyone could suggest a simple project =========================
Car tachometer. Sniff the alternator bumps on the battery 12V. [Non-text portions of this message have been removed]
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Re: 68HC11 Project - Mike McCarty - Nov 18 16:58:00 2005
BobGardner@BobG... wrote:
>
> In a message dated 11/18/05 10:11:36 A.M. Eastern Standard Time,
> nilesfantasy@nile... writes:
>
> I was wondering if anyone could suggest a simple project > =========================
> Car tachometer. Sniff the alternator bumps on the battery 12V.
I recommend against this. There are three problems with it
which are, I deem, enough to make it unsuitable for the
newbie
(1) Power conditioning. Automotive supplies have spikes on them,
often exceeding 70V. Connecting a computer directly via a
cigarette lighter power outlet, say, will almost certainly
result in a dead computer.
(2) Signal conditioning. Same issue.
(3) Environmental problems. This is a little less of an issue
with a project, but with a serious design it would be. Automobiles
are subject to enormous variations in temperature and humidity,
and enormous amounts of vibration (can you say "no sockets allowed").
Another issue is that the RPM so indicated would be specific to
a particular automobile. Also, usually, one must demonstrate
the project. This means having an *alternate* means to show
the actual RPM, and also getting the prof. to go out into
the parking lot and watch the demonstration there, rather
than in the lab.
Mike
--
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
>
> In a message dated 11/18/05 10:11:36 A.M. Eastern Standard Time,
> nilesfantasy@nile... writes:
>
> I was wondering if anyone could suggest a simple project > =========================
> Car tachometer. Sniff the alternator bumps on the battery 12V.
I recommend against this. There are three problems with it
which are, I deem, enough to make it unsuitable for the
newbie
(1) Power conditioning. Automotive supplies have spikes on them,
often exceeding 70V. Connecting a computer directly via a
cigarette lighter power outlet, say, will almost certainly
result in a dead computer.
(2) Signal conditioning. Same issue.
(3) Environmental problems. This is a little less of an issue
with a project, but with a serious design it would be. Automobiles
are subject to enormous variations in temperature and humidity,
and enormous amounts of vibration (can you say "no sockets allowed").
Another issue is that the RPM so indicated would be specific to
a particular automobile. Also, usually, one must demonstrate
the project. This means having an *alternate* means to show
the actual RPM, and also getting the prof. to go out into
the parking lot and watch the demonstration there, rather
than in the lab.
Mike
--
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - BobG...@... - Nov 18 17:55:00 2005
In a message dated 11/18/05 4:01:53 P.M. Eastern Standard Time,
Mike.McCarty@Mike... writes:
I recommend against this. There are three problems with it
which are, I deem, enough to make it unsuitable for the
newbie
=====================
HehHeh.... yeah... its a neat project tho...I bet he picks this one [Non-text portions of this message have been removed]
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Re: 68HC11 Project - Mark Schultz - Nov 18 18:02:00 2005
--- In m68HC11@m68H..., "nilesfantasy" <nilesfantasy@y...> wrote:
>
> I was wondering if anyone could suggest a simple project that could be
> conducted on the Motorola 68HC11.
...
One of the first "real" projects I did with a microcontroller was a
simple digital clock.
If you go with this idea, I'd suggest using a dedicated LED driver IC
(see http://www.maxim-ic.com for some good candidates) or a character
mode LCD module for a display. The only other hardware you'll need
(other than your micro development board) are a few pushbuttons tied
to inputs (with pull-up or pull-down resistors) that you'll use to set
the clock.
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
>
> I was wondering if anyone could suggest a simple project that could be
> conducted on the Motorola 68HC11.
...
One of the first "real" projects I did with a microcontroller was a
simple digital clock.
If you go with this idea, I'd suggest using a dedicated LED driver IC
(see http://www.maxim-ic.com for some good candidates) or a character
mode LCD module for a display. The only other hardware you'll need
(other than your micro development board) are a few pushbuttons tied
to inputs (with pull-up or pull-down resistors) that you'll use to set
the clock.
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - emmettredd - Nov 18 18:05:00 2005
--- In m68HC11@m68H..., "nilesfantasy" <nilesfantasy@y...>
wrote:
>
> I was wondering if anyone could suggest a simple project that could
be
> conducted on the Motorola 68HC11. We had originally thought of doing
a
> digital thermometer but another group has already proposed to doing
> that. We were looking for something along those lines though. Any
> suggestions would be greatly appreciated. Pressure measurement is close to my heart.
You could make a frequency counter. Look in this lists archives and
you might find offer of some software.
Emmett Redd
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wrote:
>
> I was wondering if anyone could suggest a simple project that could
be
> conducted on the Motorola 68HC11. We had originally thought of doing
a
> digital thermometer but another group has already proposed to doing
> that. We were looking for something along those lines though. Any
> suggestions would be greatly appreciated. Pressure measurement is close to my heart.
You could make a frequency counter. Look in this lists archives and
you might find offer of some software.
Emmett Redd
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - Daniel Bull - Nov 18 19:12:00 2005
On 18 Nov 2005 at 15:07, nilesfantasy wrote:
> I was wondering if anyone could suggest a simple project that could be
> conducted on the Motorola 68HC11. We had originally thought of doing a
> digital thermometer but another group has already proposed to doing
> that. We were looking for something along those lines though. Any
> suggestions would be greatly appreciated. Seems to me that sending a single msg out the SCI to a dumb terminal would qualify.
After that, try sending msgs both ways, with responses from the HC11. That's about as
simple as you can get, unless you are using Buffalo and an EVB. If you want a safe
tach project, measure pulses from a brushless motor or a stepper You could control the
motor with your HC11 or just measure pulses from a manually controlled motor and write
the speed to some output device. You can protect the chip with a Schmitt trigger.
Is this a hardware project, a software project, or both? You don't say if you have to
design your own boards, or if you will use a kit, or some such. Anyway, Tom Fox's
"Programming and Customizing the HC11 Microcontroller" has both hardware and
software stuff for weather apparatus.
There are at least a gazillion small projects described on half a gazillion Web sites
dealing with all kinds of things MC68HC11. Do some research, get some ideas, and
dream up your own project. You'll learn a lot more that way.
Good luck,
Dan
Daniel Bull, PhD
Managing Partner
Hyperion Research LLC
9 Over Rock Road
Scituate, MA 02066 USA
Phone 00-1-781-545-6610
Fax 00-1-781-545-6615
www.hyperionresearch.com
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> I was wondering if anyone could suggest a simple project that could be
> conducted on the Motorola 68HC11. We had originally thought of doing a
> digital thermometer but another group has already proposed to doing
> that. We were looking for something along those lines though. Any
> suggestions would be greatly appreciated. Seems to me that sending a single msg out the SCI to a dumb terminal would qualify.
After that, try sending msgs both ways, with responses from the HC11. That's about as
simple as you can get, unless you are using Buffalo and an EVB. If you want a safe
tach project, measure pulses from a brushless motor or a stepper You could control the
motor with your HC11 or just measure pulses from a manually controlled motor and write
the speed to some output device. You can protect the chip with a Schmitt trigger.
Is this a hardware project, a software project, or both? You don't say if you have to
design your own boards, or if you will use a kit, or some such. Anyway, Tom Fox's
"Programming and Customizing the HC11 Microcontroller" has both hardware and
software stuff for weather apparatus.
There are at least a gazillion small projects described on half a gazillion Web sites
dealing with all kinds of things MC68HC11. Do some research, get some ideas, and
dream up your own project. You'll learn a lot more that way.
Good luck,
Dan
Daniel Bull, PhD
Managing Partner
Hyperion Research LLC
9 Over Rock Road
Scituate, MA 02066 USA
Phone 00-1-781-545-6610
Fax 00-1-781-545-6615
www.hyperionresearch.com
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: Re: 68HC11 Project - bart homerson - Nov 20 0:25:00 2005
A while back I uploaded a piece of code that would interface a 68HC11 to a 7221 or
7219 LED driver, and a computer. The ZIP file is called Picktolight Demo. There is a bug
in the code for the 68HC11 that does not allow displaying more than 2 characters. Since
the project that I developted the code for didn't take off, I didn't work any further on
troubleshooting it. I figure that perhaps you could take the clock idea and create a
simple circuit that is complex at the same time. What I am saying is that you could create
a clock, but instead of having the 68HC11 do the timing and display for the clock, create
a small VB program that displays the time, sends the characters to the 68HC11, which in
turn displays the charachters via the LED driver chips. This project would encompass
subjects such as PC to 68HC11 communication, 68HC11 to LED driver interfacing, etc.
Or, instead of a clock, perhaps a Scoreboard would be more your speed. I found this project whilst working on the Pick-to-light project and the folks that worked on this project are still around. Here is the link:
http://64.233.161.104/search?q=cache:uIN4yWw0TGMJ:www.messiah.edu/acdept/depthome/engineer/Projects/edr_finalreport/pdf/TeamScoreboard.pdf+68hc11+scoreboard&hl=en
Just a thought.
LF
Mark Schultz <n9xmj@n9xm...> wrote:
--- In m68HC11@m68H..., "nilesfantasy" <nilesfantasy@y...> wrote:
>
> I was wondering if anyone could suggest a simple project that could be
> conducted on the Motorola 68HC11.
...
One of the first "real" projects I did with a microcontroller was a
simple digital clock.
If you go with this idea, I'd suggest using a dedicated LED driver IC
(see http://www.maxim-ic.com for some good candidates) or a character
mode LCD module for a display. The only other hardware you'll need
(other than your micro development board) are a few pushbuttons tied
to inputs (with pull-up or pull-down resistors) that you'll use to set
the clock.
SPONSORED LINKS
Freescale semiconductor inc Microcontrollers Pic microcontrollers 8051 microprocessor
---------------------------------
YAHOO! GROUPS LINKS ---------------------------------
[Non-text portions of this message have been removed]
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Or, instead of a clock, perhaps a Scoreboard would be more your speed. I found this project whilst working on the Pick-to-light project and the folks that worked on this project are still around. Here is the link:
http://64.233.161.104/search?q=cache:uIN4yWw0TGMJ:www.messiah.edu/acdept/depthome/engineer/Projects/edr_finalreport/pdf/TeamScoreboard.pdf+68hc11+scoreboard&hl=en
Just a thought.
LF
Mark Schultz <n9xmj@n9xm...> wrote:
--- In m68HC11@m68H..., "nilesfantasy" <nilesfantasy@y...> wrote:
>
> I was wondering if anyone could suggest a simple project that could be
> conducted on the Motorola 68HC11.
...
One of the first "real" projects I did with a microcontroller was a
simple digital clock.
If you go with this idea, I'd suggest using a dedicated LED driver IC
(see http://www.maxim-ic.com for some good candidates) or a character
mode LCD module for a display. The only other hardware you'll need
(other than your micro development board) are a few pushbuttons tied
to inputs (with pull-up or pull-down resistors) that you'll use to set
the clock.
SPONSORED LINKS
Freescale semiconductor inc Microcontrollers Pic microcontrollers 8051 microprocessor
---------------------------------
YAHOO! GROUPS LINKS ---------------------------------
[Non-text portions of this message have been removed]
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - Paul B. Webster VK2BZC - Nov 20 17:14:00 2005
Seems there's a fair spread of potential sophistication here.
Presuming this to be non-trivial, then any concept should have a few
special "features" provided by the availability of computing power. The
tacho idea is such an example - signal processing, but I won't butt into
the current argument.
I have been unable to find the reference, but for a digital clock, one
novel design used a dot-matrix (mini-"Times Square") display and
interpreted time in alphanumerics such as "it's nearly ten past seven".
Another concept; this kit: http://tinyurl.com/d92jq speaks for itself.
The "propeller clock" and its commercial incarnations are of
course, legion nowadays. There's a kit version on my bench (somewhere).
Many of these designs are more suited to a PIC or AVR (faster,
cheaper, smaller) and one such which is dear to my heart - but I haven't
done it yet - is the digital metronome which with a 2.5 digit display
and a few buttons would allow setting of the beat by tapping it into one
button, the corresponding rate would then be displayed and it would
proceed from there. Clearly the rate could alternately be incremented
and decremented by "up" and "down" buttons.
A *really* minimal design (12C509) - two input buttons and two
outputs, is the "ultimate" windscreen wiper controller (well OK, not the
rain-sensing one!).
--
Cheers,
Paul B.
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Presuming this to be non-trivial, then any concept should have a few
special "features" provided by the availability of computing power. The
tacho idea is such an example - signal processing, but I won't butt into
the current argument.
I have been unable to find the reference, but for a digital clock, one
novel design used a dot-matrix (mini-"Times Square") display and
interpreted time in alphanumerics such as "it's nearly ten past seven".
Another concept; this kit: http://tinyurl.com/d92jq speaks for itself.
The "propeller clock" and its commercial incarnations are of
course, legion nowadays. There's a kit version on my bench (somewhere).
Many of these designs are more suited to a PIC or AVR (faster,
cheaper, smaller) and one such which is dear to my heart - but I haven't
done it yet - is the digital metronome which with a 2.5 digit display
and a few buttons would allow setting of the beat by tapping it into one
button, the corresponding rate would then be displayed and it would
proceed from there. Clearly the rate could alternately be incremented
and decremented by "up" and "down" buttons.
A *really* minimal design (12C509) - two input buttons and two
outputs, is the "ultimate" windscreen wiper controller (well OK, not the
rain-sensing one!).
--
Cheers,
Paul B.
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
Re: 68HC11 Project - David Lincoln - Nov 21 10:31:00 2005
BobGardner@BobG... wrote:
> In a message dated 11/18/05 4:01:53 P.M. Eastern Standard Time,
> Mike.McCarty@Mike... writes:
>
> I recommend against this. There are three problems with it
> which are, I deem, enough to make it unsuitable for the
> newbie >
> =====================
>
> HehHeh.... yeah... its a neat project tho...I bet he picks this one > [Non-text portions of this message have been removed] I agree. Mike is missing the point of student projects. The goal is to
demonstrate the ability to recognize and deal with a variety of
technical challenges with (hopefully) inovative ideas - not to produce a
commercially viable product. As for the demo, most students video tape
the demo beforehand in case Murphy visits during the "live" presentation.
Dave > SPONSORED LINKS
> Freescale semiconductor inc
> <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q>
> Microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g>
> Pic microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw>
>
> 8051 microprocessor
> <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A >
> ------------------------------------------------------------------------
> >. > ------------------------------------------------------------------------
[Non-text portions of this message have been removed]
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
> Mike.McCarty@Mike... writes:
>
> I recommend against this. There are three problems with it
> which are, I deem, enough to make it unsuitable for the
> newbie >
> =====================
>
> HehHeh.... yeah... its a neat project tho...I bet he picks this one > [Non-text portions of this message have been removed] I agree. Mike is missing the point of student projects. The goal is to
demonstrate the ability to recognize and deal with a variety of
technical challenges with (hopefully) inovative ideas - not to produce a
commercially viable product. As for the demo, most students video tape
the demo beforehand in case Murphy visits during the "live" presentation.
Dave > SPONSORED LINKS
> Freescale semiconductor inc
> <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q>
> Microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g>
> Pic microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw>
>
> 8051 microprocessor
> <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A >
> ------------------------------------------------------------------------
> >. > ------------------------------------------------------------------------
[Non-text portions of this message have been removed]
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Re: 68HC11 Project - Mike Robertson - Nov 21 14:15:00 2005
Dont laugh! And Dont be Gay!
David Lincoln <davel@dave...> wrote: BobGardner@BobG... wrote: > In a message dated 11/18/05 4:01:53 P.M. Eastern Standard Time,
> Mike.McCarty@Mike... writes:
>
> I recommend against this. There are three problems with it
> which are, I deem, enough to make it unsuitable for the
> newbie >
> =====================
>
> HehHeh.... yeah... its a neat project tho...I bet he picks this one > [Non-text portions of this message have been removed] I agree. Mike is missing the point of student projects. The goal is to
demonstrate the ability to recognize and deal with a variety of
technical challenges with (hopefully) inovative ideas - not to produce a
commercially viable product. As for the demo, most students video tape
the demo beforehand in case Murphy visits during the "live" presentation.
Dave > SPONSORED LINKS
> Freescale semiconductor inc
> <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q>
> Microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g>
> Pic microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw>
>
> 8051 microprocessor
> <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A >
> ------------------------------------------------------------------------
> >. > ------------------------------------------------------------------------
[Non-text portions of this message have been removed]
---------------------------------
YAHOO! GROUPS LINKS ---------------------------------
---------------------------------
Yahoo! FareChase - Search multiple travel sites in one click.
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David Lincoln <davel@dave...> wrote: BobGardner@BobG... wrote: > In a message dated 11/18/05 4:01:53 P.M. Eastern Standard Time,
> Mike.McCarty@Mike... writes:
>
> I recommend against this. There are three problems with it
> which are, I deem, enough to make it unsuitable for the
> newbie >
> =====================
>
> HehHeh.... yeah... its a neat project tho...I bet he picks this one > [Non-text portions of this message have been removed] I agree. Mike is missing the point of student projects. The goal is to
demonstrate the ability to recognize and deal with a variety of
technical challenges with (hopefully) inovative ideas - not to produce a
commercially viable product. As for the demo, most students video tape
the demo beforehand in case Murphy visits during the "live" presentation.
Dave > SPONSORED LINKS
> Freescale semiconductor inc
> <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q>
> Microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g>
> Pic microcontrollers
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw>
>
> 8051 microprocessor
> <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A >
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Re: 68HC11 Project - Mike McCarty - Nov 21 20:42:00 2005
David Lincoln wrote:
> BobGardner@BobG... wrote: >>In a message dated 11/18/05 4:01:53 P.M. Eastern Standard Time,
>>Mike.McCarty@Mike... writes:
>>
>>I recommend against this. There are three problems with it
>>which are, I deem, enough to make it unsuitable for the
>>newbie
>>
>>
>>
>>=====================
>>
>>HehHeh.... yeah... its a neat project tho...I bet he picks this one
>>
>>
>>[Non-text portions of this message have been removed] >
> I agree. Mike is missing the point of student projects. The goal is to
I have not missed anything. I note that you didn't argue against
any of the facts I presented. Also note the careful use of the
words "recommend" and "deem".
> demonstrate the ability to recognize and deal with a variety of
> technical challenges with (hopefully) inovative ideas - not to produce a
> commercially viable product. As for the demo, most students video tape
I didn't say that it was. OTOH, I realize the limitations of
students. If they take on this particular project, I suspect that
the project would work. For a half hour or so. And then mysteriously
stop working. When the AC kicked in. And the processor board
(presumably costing approximately $100 for a demonstrator,
or equivalent amounts of time to construct) would have problems
which might be beyond either the fiscal or electronic
capabilities to replace or repair. Blown voltage regulator,
probably blown uC, possibly blown 74HC573 or similar if
expanded mode, possibly blown op amp(s), possibly blown RAM
chips.
Unless you've designed a uC board with 70+V 50-100ms long pulses
applied to it, and seen what happens, then I suggest that
you not recommend others to do so.
I deem this is not a good project. You may deem it is, but I
suspect you haven't had a controller board blown on you from
being connected to an automotive supply.
One way around this would be to isolate the supply for the
uC by running it off a separate battery supply, and attach
the "battery voltage" through some heavy filtering, using say
a resistor feeding reverse connected zeners of about 24V and
then using AC coupling.
Students will make mistakes. I expect three or four in such
a project. This shouldn't also cost the students $300 to
$400 in blown uC boards.
Another issue is a safety one. Direct connections to the
battery can supply 200+ amps. True, the voltage is not
dangerous, but students probably do not know to remove
all jewelry before dealing with such a connection.
Even the "cigarette lighter" connection can supply in
excess of 10 amps. 120 W is a serious amount of power.
> the demo beforehand in case Murphy visits during the "live" presentation.
>
> Dave
Mike
--
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )
> BobGardner@BobG... wrote: >>In a message dated 11/18/05 4:01:53 P.M. Eastern Standard Time,
>>Mike.McCarty@Mike... writes:
>>
>>I recommend against this. There are three problems with it
>>which are, I deem, enough to make it unsuitable for the
>>newbie
>>
>>
>>
>>=====================
>>
>>HehHeh.... yeah... its a neat project tho...I bet he picks this one
>>
>>
>>[Non-text portions of this message have been removed] >
> I agree. Mike is missing the point of student projects. The goal is to
I have not missed anything. I note that you didn't argue against
any of the facts I presented. Also note the careful use of the
words "recommend" and "deem".
> demonstrate the ability to recognize and deal with a variety of
> technical challenges with (hopefully) inovative ideas - not to produce a
> commercially viable product. As for the demo, most students video tape
I didn't say that it was. OTOH, I realize the limitations of
students. If they take on this particular project, I suspect that
the project would work. For a half hour or so. And then mysteriously
stop working. When the AC kicked in. And the processor board
(presumably costing approximately $100 for a demonstrator,
or equivalent amounts of time to construct) would have problems
which might be beyond either the fiscal or electronic
capabilities to replace or repair. Blown voltage regulator,
probably blown uC, possibly blown 74HC573 or similar if
expanded mode, possibly blown op amp(s), possibly blown RAM
chips.
Unless you've designed a uC board with 70+V 50-100ms long pulses
applied to it, and seen what happens, then I suggest that
you not recommend others to do so.
I deem this is not a good project. You may deem it is, but I
suspect you haven't had a controller board blown on you from
being connected to an automotive supply.
One way around this would be to isolate the supply for the
uC by running it off a separate battery supply, and attach
the "battery voltage" through some heavy filtering, using say
a resistor feeding reverse connected zeners of about 24V and
then using AC coupling.
Students will make mistakes. I expect three or four in such
a project. This shouldn't also cost the students $300 to
$400 in blown uC boards.
Another issue is a safety one. Direct connections to the
battery can supply 200+ amps. True, the voltage is not
dangerous, but students probably do not know to remove
all jewelry before dealing with such a connection.
Even the "cigarette lighter" connection can supply in
excess of 10 amps. 120 W is a serious amount of power.
> the demo beforehand in case Murphy visits during the "live" presentation.
>
> Dave
Mike
--
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!
(You need to be a member of hc11 -- send a blank email to hc11-subscribe@yahoogroups.com )