On 4 December 2010 00:46, Kirk Wallace kwall...@wallacecompany.com
wrote:
I'm working on using an ATtiny to watch EMC2's charge pump.
Why not use a charge pump circuit to watch the charge pump signal?
That is what it was designed for, and is probably the most fail-safe
solution. The timeout
I was wondering, can a fault ever occur with EMC where the frequency of the
charge pump frequency increases?? This would keep the charge pump detector
'up', but a uP would detect an error condition.
Regards
Roland
On 8 December 2010 20:53, John Kasunich jmkasun...@fastmail.fm wrote:
On 4
actually - really? we could get it - just paying for your time?
thanks
sam
On 12/8/2010 1:25 PM, Roland Jollivet wrote:
I was wondering, can a fault ever occur with EMC where the frequency of the
charge pump frequency increases?? This would keep the charge pump detector
'up', but a uP would
Roland Jollivet wrote:
I was wondering, can a fault ever occur with EMC where the frequency of the
charge pump frequency increases?? This would keep the charge pump detector
'up', but a uP would detect an error condition.
It seems unlikely.
The most likely effect of a software problem
S, Roland Jollivet piše:
I was wondering, can a fault ever occur with EMC where the frequency of the
charge pump frequency increases?? This would keep the charge pump detector
'up', but a uP would detect an error condition.
Regards
Roland
NE567 can solve that too...
On Wed, 2010-12-08 at 13:53 -0500, John Kasunich wrote:
On 4 December 2010 00:46, Kirk Wallace kwall...@wallacecompany.com
wrote:
I'm working on using an ATtiny to watch EMC2's charge pump.
Why not use a charge pump circuit to watch the charge pump signal?
That is what it was designed
On Wed, 08 Dec 2010 12:15 -0800, Kirk Wallace
kwall...@wallacecompany.com wrote:
This is what I have from the last time I played with the above type of
circuit (sourced by JK?):
http://www.wallacecompany.com/machine_shop/Shizuoka/watchdog-1b.png
It worked on my breadboard but didn't work
On Wed, 2010-12-08 at 15:53 -0500, John Kasunich wrote:
... snip
It isn't that complicated. A 0.1uF output cap (C3) will work for
the frequencies and delays we are interested in with EMC. Choose
the output time constant and pick the R5 accordingly: R5 = T / C3.
... snip
Thank you John. I
On Wed, Dec 08, 2010 at 07:00:27PM -0800, Kirk Wallace wrote:
Thank you John. I really appreciate the time you take to help. Using
your information above, I redrew the schematic, which I'll revise as I
go. It's at the bottom of the page here:
S, Erik Christiansen piše:
On Wed, Dec 08, 2010 at 07:00:27PM -0800, Kirk Wallace wrote:
Thank you John. I really appreciate the time you take to help. Using
your information above, I redrew the schematic, which I'll revise as I
go. It's at the bottom of the page here:
If the pulse from EMC or any other program is consistent, then your circuit
only needs one little tactile switch. If you press this switch, the micro
will go into learn mode and time the interval between pulses from EMC. If
can now add a +/- 10% or whatever margin and flag the alarm outside that.
S, Erik Christiansen piše:
On Sat, Dec 04, 2010 at 09:04:54AM -0800, Kirk Wallace wrote:
Then I got to thinking about what Slavko mentioned previously,
about this is a safety device and I should think in terms of how it
could fail.
So long as the microcontroller's on-board watchdog is
On Sun, 2010-12-05 at 09:44 +0200, Slavko Kocjancic wrote:
... snip
That's funn... If you already have watchdog (hardware) to keep ATtiny
RESET good why do you need that MCU at all?!? Seems nonsense for me.
I think because the MCU is used to validate EMC2 before powering up the
dangerous bits
On Sun, Dec 05, 2010 at 01:40:58AM -0800, Kirk Wallace wrote:
On Sun, 2010-12-05 at 09:44 +0200, Slavko Kocjancic wrote:
... snip
That's funn... If you already have watchdog (hardware) to keep ATtiny
RESET good why do you need that MCU at all?!? Seems nonsense for me.
I think because the
S, Erik Christiansen piše:
On Sun, Dec 05, 2010 at 01:40:58AM -0800, Kirk Wallace wrote:
On Sun, 2010-12-05 at 09:44 +0200, Slavko Kocjancic wrote:
... snip
That's funn... If you already have watchdog (hardware) to keep ATtiny
RESET good why do you need that MCU at all?!? Seems nonsense for
Just my 2 cents...
For watchdog thing I think the ATtiny is just overkill. That kind of
operation can be done with simple 555 timer or even few diodes and
transistor.
Don't get me wrong. The ATtiny (15L) for example can do that job but as
safety device the any micro isn't good way. And if system
On Fri, Dec 03, 2010 at 07:54:57PM -0800, Kirk Wallace wrote:
I really had no idea if the memory would be enough. I would have worked
on it until I went blind in one eye.
Oh, it's enough for what you want to do now. But ISTR a home switch +
index filter, on the other thread. It can do that
I would use a single pin for communication to the host with some variant
of the one-wire protocol used by iButtons.
It is simple, elegant, and relatively insensitive to timing.
Ken
On 12/04/2010 04:30 AM, Erik Christiansen wrote:
On Fri, Dec 03, 2010 at 07:54:57PM -0800, Kirk Wallace wrote:
On Sat, 2010-12-04 at 20:30 +1100, Erik Christiansen wrote:
... snip
Oh, it's enough for what you want to do now. But ISTR a home switch +
index filter, on the other thread. It can do that too, if pins can be
found. But then there's the extra functionality we just have to have,
when we're
On Sat, 2010-12-04 at 09:16 -0500, Kenneth Lerman wrote:
I would use a single pin for communication to the host with some variant
of the one-wire protocol used by iButtons.
It is simple, elegant, and relatively insensitive to timing.
Ken
USB is attractive because I can get a cheap AVR
Changing track, again, the charge pump signal may not be the best thing
to use, because all it would take is noise on the line to mimic the
pump. I think I should make some sort of data pump component, such as
send out a byte every servo period, then have the watchdog watcher check
for the
On Sat, 2010-12-04 at 09:38 -0800, Peter C. Wallace wrote:
... snip
Maybe a simple watchdog that avoids the noise trigger issue would be a DPLL
that locks onto the chargepump signal. Once locked it enables its output and
stops rate tracking. Any subsequent variation in rate (beyond some
On Sat, Dec 04, 2010 at 09:04:54AM -0800, Kirk Wallace wrote:
Then I got to thinking about what Slavko mentioned previously,
about this is a safety device and I should think in terms of how it
could fail.
So long as the microcontroller's on-board watchdog is enabled, you have
a watchdog
I'm working on using an ATtiny to watch EMC2's charge pump. The plan is
to have a count down that gets reset by a charge pump edge. If the
counter reaches 0, then an alarm pin gets set. The counter reset value
determines how long the charge pump has to do a reset. I can write code
with the
On Fri, Dec 03, 2010 at 02:46:16PM -0800, Kirk Wallace wrote:
I'm working on using an ATtiny to watch EMC2's charge pump. The plan is
to have a count down that gets reset by a charge pump edge. If the
counter reaches 0, then an alarm pin gets set. The counter reset value
determines how long
I like the idea of a dip switch or solder bridges if one doesn't plan on
changing the setting alot and wants to save the cost of the dip switch.
while the pot would be easy to adjust, it's less precise than a truth table
of the dip/bridge positions and the resultant reset timer.
Jim
On Sat, Dec
On Sat, 2010-12-04 at 12:50 +1100, Erik Christiansen wrote:
... snip
Once a serial link to the EMC2 host exists, is it possible to resist the
temptation to put in a $3 - $4 ATmega, to limit the risk of running out
of code space, once the ancilliary functions stick their grinning faces
over the
On Fri, Dec 03, 2010 at 06:12:52PM -0800, Kirk Wallace wrote:
But shucks, if we're thinking about going to an ATmega ...
http://www.handlewithlinux.com/smallest-linux-pc
http://www.shimafuji.co.jp/product/semc5701a01.html
Mega-Kewl! (I want a black one, ... anna yellow one. :-)
Seriously
On Sat, 2010-12-04 at 09:55 +0800, Jim Coleman wrote:
I like the idea of a dip switch or solder bridges if one doesn't plan on
changing the setting alot and wants to save the cost of the dip switch.
while the pot would be easy to adjust, it's less precise than a truth table
of the dip/bridge
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