Today's Message Index:
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1. 05:46 AM - Re: Electronic Dead Reckoning Distance Calculator (nuckollsr)
2. 05:50 AM - Re: Creative led position lights (Eric M. Jones)
3. 07:49 AM - Re: Electronic Dead Reckoning Distance Calculator (user9253)
4. 08:44 AM - Re: Re: Creative led position lights (ROGER & JEAN CURTIS)
5. 08:44 AM - Re: Re: Electronic Dead Reckoning Distance Calculator (Ken)
6. 08:45 AM - planning (Jesse Jenks)
7. 09:35 AM - SD-8 Z-13/Z-25 practical setup (cccbuntin)
8. 06:25 PM - PIC Microchip was Re: Re: Electronic Dead Reckoning Distance Calculator (Ed Anderson)
9. 07:25 PM - Re: Re: Electronic Dead Reckoning Distance Calculator (Robert L. Nuckolls, III)
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Subject: | Re: Electronic Dead Reckoning Distance Calculator |
Joe,
Pretty slick. Your project reminds me of some other instances many moons ago where
cheap calculators where pressed into service as event counters. Again, repeated
actuation of the equals-key produced an increment to the display. When counting
this was an integer of 1, for your application, the increment is a calculated
variable based on present conditions.
A thought for further enhancement of your recipe for success. A PIC microcontroler
could replace both IC's and the crystal. The jellybean processors have built
in timers that are probably accurate enough to serve in this short term prediction
mode. Further, many of them have trimming features for the internal oscillator
that permits an improvement on accuracy at the time the device is assembled.
Your total parts count could be reduced to battery (Lion button cell?), controller,
opto-coupler, resistor and perhaps one Vdd to Gnd bypass capacitor. Obviously,
the same device could be used on terrestrial journeys as well . . . especially
in vehicles on cruise control.
This would be a good project for budding electro-wienies offering a mix of electronics,
small scale fabrication, adaptation of existing products to new applications,
perhaps a bit of software and an example of how one can convert the 8th
grade algebra class story problem into a recipe for success.
Thanks for sharing.
Bob . . .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=281013#281013
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Subject: | Re: Creative led position lights |
My advice....(and I am trying to be nice)...don't use them. There are a ton of
better LED solutions to the problem that were not available when Bill introduced
these.
If you want to design your own:
periheliondesign.com/downloads/redandgreenledpositionlights.pdf
I am not selling any.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=281015#281015
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Subject: | Re: Electronic Dead Reckoning Distance Calculator |
Bob,
Thanks for your comments. I am really proud of this project, but did not expect many replies because GPS has made dead reckoning obsolete. You and another friend suggested using a PIC micro-controller. Unfortunately I know very little about them. I understand that a programmer is required. It was fun learning how to program the CD74HC4059 counter-divider. Learning how to program a PIC micro-controller should be fun too. There are programmers listed on eBay from $15 to over $200. Does anyone have a suggestion on which one to buy? I want to build a capacitance to voltage converter for a fuel gauge like this:http://www.rstengineering.com/kitplanes/KP0007/KPsch.jpg
Can a PIC micro-controller replace much of that circuit?
Thanks, Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=281029#281029
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Subject: | Re: Creative led position lights |
If you want to design your own:
periheliondesign.com/downloads/redandgreenledpositionlights.pdf
I am not selling any.
--------
Eric M. Jones
www.PerihelionDesign.com
Eric,
I noticed that this document has a Dec 04 Rev date. Do you
know if there have been any significant position light regulation changes
since then?
Roger
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Subject: | Re: Electronic Dead Reckoning Distance Calculator |
Joe
Take a look at the AVR BUTTERLY for $20. from digi-key.com
Amazing amount of hardware on the tiny development board.
No programmer required just an RS232 (serial port) on your computer.
Software STUDIO4 is free.
Ken
user9253 wrote:
> <fran4sew@banyanol.com>
>
> Bob, Thanks for your comments. I am really proud of this project,
> but did not expect many replies because GPS has made dead reckoning
> obsolete. You and another friend suggested using a PIC
> micro-controller. Unfortunately I know very little about them. I
> understand that a programmer is required. It was fun learning how to
> program the CD74HC4059 counter-divider. Learning how to program a
> PIC micro-controller should be fun too. There are programmers listed
> on eBay from $15 to over $200. Does anyone have a suggestion on
> which one to buy? I want to build a capacitance to voltage converter
> for a fuel gauge like
> this:http://www.rstengineering.com/kitplanes/KP0007/KPsch.jpg Can a
> PIC micro-controller replace much of that circuit? Thanks, Joe
>
> -------- Joe Gores
>
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Bob wrote:
We're getting several issues tangled together here. First=2C
unless the builder is going to use a robust starter pushbutton
designed for abuse by two-stage contactor/solenoids then
some sort of "buffering" is worth considering.
Assuming you still wish to control the Skytec contactor
directly=2C then adding a relay per Z-22 is the way to
go about it. Assuming you already have or wish to use
the single stage starter contactor=2C then you don't want
to "jumper" the Skytec solenoid coil to the main terminal.
This gives rise to the "run on" phenomenon described. In
this case=2C you take the "I" terminal from the external
single stage contactor over to the Skytec's coil
Thanks Bob. I am really struggling to absorb as much as I can from this dis
cussion while also readying everything else I can find from your website an
d other sources=2C while also trying to learn Aeroelectric 101... My B-lead
is about to smoke. So=2C I guess the jumper is what causes the run-on=2C
and whatever I do I don't want it in there. I don't already have a separate
contactor=2C so the way I understand it my options are=3B 1) use Z-22 with
a relay=2C 2) just use a push button rated for 30 amps and no relay.
Can you explain why run-on is a problem if it only lasts a couple seconds?
Jesse
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Subject: | SD-8 Z-13/Z-25 practical setup |
I have set-up the SD-8 as per drawing Z-13 and have just recently run across the
Z-25 diagram. I can do this, but I'll have to order parts and do some time
consuming changes (which is okay if worth it).
I have read many of the posts, and noticed Bob stated (back in 2006 from a post)
that "The only thing that the Z-25 mod gets you is a cold startup sans battery."
I am trying to figure out if that is a typo or not? I am trying to figure out
if it's worthwhile for me to do this upgrade/mod? Seems like several people have
had issues with this Z-25 setup. If it is just for a cold startup, I'm not
too worried about having that update. Chances are the battery will have (noticed
I said chances) enough juice to excite the sd-8 without it having to be self
exciting, especially in the way I plan to have it wired.
Right now, I have a three position switch setup that is labeled off -- stby alt
(for the SD-8 ) -- ess pwr. If I go to ess pwr, the SD-8 is also on. As of
now, I plan on flying around with the switch in stby pwr, and moving it to ess
pwr in the event my main alt fails (to run what's on the ess pwr and have the
stby pwr).
>From my understanding of this (of flying around with switch in stby pwr with Z-13
diagram), it will be "energized" and ready if the 60 amp alt fails. It will
be ready because the 60 amp alt is producing more volts than the sd-8, so the
sd-8 is just sitting there, excited, ready to help when the 60 amp alt drops
off line. I will know the 60 amp alt fails from the "main volts warn" light
from the LR-3, in which case I will reach down and move the switch to ess bus,
allowing only the ess bus to be powered and allowing the sd-8 to charge the system
(battery/essential bus). Do I have this correct?
Any thoughts or criticism on this setup would be great. Thank you very much.
Dave
[Question] [Question]
--------
Building RV-8
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=281052#281052
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Subject: | Re: Electronic Dead Reckoning |
Distance Calculator
Hi Joe,
I started programming PIC microcontrollers at the age of 65 - yes, it hurt
the head a lot to begin with, but the payoff was worth it (at least to me it
was). It is not easy (well, it wasn't for me), but there is plenty of help
out there. I had done a small amount of work with analog components but
finally realized that the flexibility and future of the digital chip was
worth the agony of learning it {:>)
There are a number of PIC (microchip)forums and hundreds of products and
more chips types than you can count. Just about every one comes with all
sorts of peripheral modules imbedded in the chip (such as an Analog -
Digital converter, Pulse detectors, Rs232, USB comm. Modules, etc,) along
with up to around 128K of memory running at up to 40 MHz. Well there are
simply too mean features and capabilities to enumerate.
While the PIC is a tremendously capable series of chips and it is well
supported with high level languages (primarily C, but some Basic and
Pascal), there are also other equally capable chips - basic stamp, ... well
dozens which might be simpler to start with - particularly if you needs are
minimal.
The PIC is know as a "bit banging" chips because it has a number of special
registers of 8 bits (larger ones in later chips) in which each bit of the 8
bit byte must be set correctly or it simply will not work properly. If you
find this kind of detail tedious - a different chip might be a better
choice.
The internet is the place to start.
Good luck
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of user9253
Sent: Monday, January 11, 2010 10:47 AM
Subject: AeroElectric-List: Re: Electronic Dead Reckoning Distance
Calculator
Bob,
Thanks for your comments. I am really proud of this project, but did not
expect many replies because GPS has made dead reckoning obsolete. You and
another friend suggested using a PIC micro-controller. Unfortunately I know
very little about them. I understand that a programmer is required. It was
fun learning how to program the CD74HC4059 counter-divider. Learning how to
program a PIC micro-controller should be fun too. There are programmers
listed on eBay from $15 to over $200. Does anyone have a suggestion on
which one to buy? I want to build a capacitance to voltage converter for a
fuel gauge like
this:http://www.rstengineering.com/kitplanes/KP0007/KPsch.jpg
Can a PIC micro-controller replace much of that circuit?
Thanks, Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=281029#281029
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Subject: | Re: Electronic Dead Reckoning Distance Calculator |
At 09:47 AM 1/11/2010, you wrote:
Bob,
Thanks for your comments. I am really proud of this project, but did
not expect many replies because GPS has made dead reckoning
obsolete. You and another friend suggested using a PIC
micro-controller. Unfortunately I know very little about them. I
understand that a programmer is required. It was fun learning how to
program the CD74HC4059 counter-divider. Learning how to program a
PIC micro-controller should be fun too.
There's a ton of pic development systems out there
for under $100, dozens for under $50. You might
think about subscribing to Nuts and Volts magazine
http://www.nutsvolts.com/
Their advertisers include a number of hobbyist PIC
systems to get started with. The one we use here is
only $29 and comes with an exceedingly capable editor,
assembler package. I think it's the PicKit II. You can
go the assembler route (I think there's only 35 instructions
to learn how to use) or the Tiny Basic round offered in
the Basic Stamp series systems . . . and others.
http://www.parallax.com/
http://www.parallax.com/Resources/GettingStarted/tabid/270/Default.aspx
There are programmers listed on eBay from $15 to over $200. Does
anyone have a suggestion on which one to buy?
This one is $100 but probably your best bet to get
up and running quickly in Tiny Basic or Assembler
http://tinyurl.com/yfxgka4
See also:
http://www.mstracey.btinternet.co.uk/pictutorial/picmain.htm
http://tutor.al-williams.com/pic-intro.html
http://www.hobbyprojects.com/microcontroller_tutorials.html
I want to build a capacitance to voltage converter for a fuel
gauge like this:http://www.rstengineering.com/kitplanes/KP0007/KPsch.jpg
Can a PIC micro-controller replace much of that circuit?
Oh my, yes. I've been halted on a program to do just that.
The program manager ran out of money. It might come back
in the spring . . .
The philosophy I'm using alternately charges the
tank capacitance through a large value resistor
and discharges it with a transistor. The time it takes
to charge the capacitor from zero to some reference
value is measured by the uP. Every other charge/discharge
cycle, a 100 pf reference capacitor is switched across the
tank line and the time to charge total capacitances is
measured.
By having a reference capacitor, calculation of tank
+ wiring capacitance is a simple ratio that wipes out
errors in charging current or comparator trip voltages.
System accuracy is dependent only on stability of
the reference capacitor and timing accuracy of the uP
(crystal controlled).
I can't offer you anything more than that right
now but I can assure you it's well within the capability of
the PICs to do the timing, operating the capacitor
switch and calculating a PWM output value that
represents % of tank contents. What's more, the
total parts count is VERY low.
Bob . . .
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