[chbot] !!!Choc fish challenge!!!!
Synco Reynders
synco.reynders at gmail.com
Sat Jul 23 14:10:53 BST 2011
Hey,
Thought it may be good to give a bit of an explanation to what I'm doing....
I've got some brushless DC motor controllers (the DealExtreme Mystery
brand)) which I noticed have an AVR on-board... and I've be wanting a motor
controller that can do:
* Forward and Reverse!!
* Doesn't refuse to start when instructed to... and continues to try if it
does fail.
* is easily controlled by a master micro so:
* doesn't do funny things when the battery gets low
* doesn't have user options/menus etc
so I decided to reverse engineer the circuit and write the controller
software.
Progress so-far: have simple RC servo interface working and have the motor
turning but only in open-loop operation.
Hopefully tomorrow it snows and I get some more done.
Cheers,
Synco
On 24 July 2011 00:33, Helmut Walle <helmut.walle at gmail.com> wrote:
>
> Hi Synco,
>
> Someone may have suggested this already, but I'm not sure. Does your micro
> have input capture capabiltiy on a timer channel? If it has then that would
> be the preferred way of getting precision timing measurements on external
> events, because it's independent of variable latencies due to other
> interrupts going off etc. But you probably already knew that... and maybe
> your micro doesn't have input capture?
>
> Kind regards,
>
> Helmut.
>
> --
> +------------------------+
> | Helmut Walle |
> | Helmut.Walle at gmail.com |
> | +64-3-388 39 54 |
> +------------------------+
>
>
> On Fri, 22 Jul 2011, Synco Reynders wrote:
>
> Well, I feel honored for winning the chocolate fish, and sorry for anyone
>> who hasn't got a mute function on this email thread.I've had a frustrating
>> day trying to code up a
>> brushless DC motor controller... (hence the procrastinating).
>> Anyway I'd like to put this winning chocolate fish up for grabs again to
>> the first person that tells me how to measure a pulse-width (connected to an
>> external interrupt),
>> glitch-free!! :
>> This is roughly what I got:
>>
>> #define TIMERWRAP 1024
>>
>> ISR(ExternalInterrupt) // highest priority
>> {
>> if (triggered on +ve edge) {
>> set to trigger on -ve edge;
>> count = TIMERWRAP - Timer;
>> }
>> else {
>> set to trigger on +ve edge;
>> count += Timer;
>> // Now Count should be the pulse length... but it has glitches see
>> below
>> }
>> }
>>
>> ISR(TimerOverflow) // overflows at TIMERWRAP ticks
>> {
>> count += TIMERWRAP;
>> ....
>> }
>>
>> ISR(other)
>> {
>> ...
>> }
>>
>> Now the problem occurs (very infrequent) when both the TimerOverflow and
>> External interrupt occur while another (non-nesting) ISR is being processed.
>> The Ext Interrupt will be
>> processed first therefore missing out on the extra TIMERWRAP. I've tried
>> compensating by reading the interrupt flag register when processing the
>> external interrupt, it reduces
>> the frequency of glitches but as-long as there is any time between reading
>> the flags register and the timer I get glitches.
>> Is this one of those impossible micro-processor problems?
>>
>>
>>
>> On 22 July 2011 14:55, Charles Manning <manningc2 at actrix.gen.nz> wrote:
>> On Friday 22 July 2011 14:46:43 Synco Reynders wrote:
>> > HP-12C is a finacial calculator.
>>
>> Synco wins the prize!
>>
>> Yes folks, the HP-12C has been in continuous production for over 30 years
>> and
>> is still the preferred choice of accountants and auditors the world over.
>>
>> There have been some slight internal changes to adjust to changes in
>> manufacturing processes, but the 12C looks the same and does the same
>> thing
>> as it has always done.
>>
>> As with most "real" HP calculators, it's RPN which makes it faster to use
>> than
>> those damn "arithmetic" calculators. Anyone who can't use RPN doesn't know
>> what they're missing!
>>
>> -- Charles
>>
>>
>>
>> > /s
>> >
>> > On 22 July 2011 14:42, Cass Jones <jones.cass at gmail.com> wrote:
>> > > The F91w still looks the same as far as I know, wikipedia reckons they
>> > > have only been around since 1991
>> > >
>> > > On Fri, Jul 22, 2011 at 2:40 PM, Charles Manning
>> > >
>> > > <manningc2 at actrix.gen.nz> wrote:
>> > > > On Friday 22 July 2011 14:33:35 Synco Reynders wrote:
>> > > >> Digital watch?
>> > > >
>> > > > I don't want a category of item. I want a Make/Model that is the
>> same
>> > > > as
>> > >
>> > > it
>> > >
>> > > > was years ago with no cosmetic changes.
>> > > >
>> > > > While Casio G-Shocks have been around for well over 20 years they
>> are
>> > > > not
>> > >
>> > > the
>> > >
>> > > > same model as the original ones and don't look the same.
>> > > >
>> > > > Hints so far:
>> > > > It takes batteries
>> > > > It has an LCD
>> > > > If you have one you probably wear a tie.
>> > > >
>> > > > No more hints yet to give others a chance...
>> > > >
>> > > >> /s
>> > > >>
>> > > >> On 22 July 2011 14:31, Charles Manning <manningc2 at actrix.gen.nz>
>> wrote:
>> > > >> > On Friday 22 July 2011 14:24:23 Cass Jones wrote:
>> > > >> > > Oh a pocket calculator the fx-82 I presume
>> > > >> >
>> > > >> > Getting closer.
>> > > >> >
>> > > >> > The FX-82 is not a single model. It is a family of models with
>> > >
>> > > different
>> > >
>> > > >> > capabilities and different look and feel.
>> > > >> >
>> > > >> > What I am looking for is a gizzmo that looks identical over the
>> last
>> > >
>> > > many
>> > >
>> > > >> > decades (except for different "Made In xxx" etc).
>> > > >> >
>> > > >> > One manufacturer. One model. Looks exactly the same.
>> > > >> >
>> > > >> > Hint3: If you have one you probably wear a tie.
>> > > >> >
>> > > >> > > On Fri, Jul 22, 2011 at 2:23 PM, Charles Manning
>> > > >> > >
>> > > >> > > <manningc2 at actrix.gen.nz> wrote:
>> > > >> > > > These are not the same gadget. They are different models made
>> by
>> > > >> > > > different manufacturers.
>> > > >> > > >
>> > > >> > > > The answer I want is a fully functional gizzmo made by the
>> same
>> > > >> > > > manufacturer under the same model number for decades.
>> > > >> > > >
>> > > >> > > > Hint 2: It has an LCD.
>> > > >> > > >
>> > > >> > > > On Friday 22 July 2011 14:20:11 Synco Reynders wrote:
>> > > >> > > >> Light-bulb? Fuse? Spark-plugs? Torch? Door-bell? ...
>> > > >> > > >> Hoping to get atleast 1 chocolate fish ;-)
>> > > >> > > >> /s
>> > > >> > > >>
>> > > >> > > >> On 22 July 2011 14:08, Charles Manning
>> > > >> > > >> <manningc2 at actrix.gen.nz>
>> > > >> >
>> > > >> > wrote:
>> > > >> > > >> > I hereby off a choc fish to the first correct answer to
>> this
>> > > >> > > >> > question...
>> > > >> > > >> >
>> > > >> > > >> > In this crazy world we live in, electronic gadgets change
>> all
>> > >
>> > > the
>> > >
>> > > >> > > >> > time. Try to
>> > > >> > > >> > find something you bought last and you will find it has
>> been
>> > > >> >
>> > > >> > replaced
>> > > >> >
>> > > >> > > >> > by a different model.
>> > > >> > > >> >
>> > > >> > > >> > There is, however, one electronic gadget that has been in
>> > > >> > > >> > production for a few
>> > > >> > > >> > decades. Same model. Same function. Still in production.
>> > > >> > > >> >
>> > > >> > > >> > What is it?
>> > > >> > > >> >
>> > > >> > > >> > Charles
>> > > >> > > >> >
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