Today's Message Index:
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1. 08:58 AM - Re: Alarm souder with multiple sources (andymeyer)
2. 04:20 PM - Re: Engine Sensors to Arduino... (andymeyer)
3. 05:30 PM - Re: Electronic Ignition spark advance signal boost (Airdog77)
4. 05:39 PM - Re: Electronic Ignition spark advance signal boost CORRECTION (Airdog77)
Message 1
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| Subject: | Re: Alarm souder with multiple sources |
Maybe a bit late, but...
Lots of options and how smart you want this to be.
Cheap and easy way if you know a bit of C might be an Arduino... Depends on your
input voltages and what IO you need...
It can turn on a bi-color LED - RED for bad stuff, yellow for alerts...
Even do voice messages with the addition of an appropriate wav module...
What do your inputs look like and what outputs do you need? (Voice, 1 LED, multiple
LED's?)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477181#477181
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| Subject: | Re: Engine Sensors to Arduino... |
Great call on the LM235 degree K sensor... I'll be using that on the front module
for the air data computer side of this thing. Can't the ground for an LM35
just be biased up a volt or so to get the negative temperatures if the voltage
conversion accounts for that 1 volt?
I spent some time looking over the DAS system... Nice setup - thank you for the
education seeing how these are really designed... I've got a EE degree from 20
years ago, but never got into circuit design. Always a development guy... Sensors
and mechanical integration of the electronics, along with calibration and
engine tuning. Now I'm getting into some fun circuit design and trying to relearn.
On 3.3V vs 5V... My module driving my display is a Teensy 3.6 - should be able
to grunt the display and ADC computations along plenty fast - 3.3V. For the engine
side module, I have used a bunch of the SAMD21 Arduino boards so I've kind
of stuck there. Using RS485 so I know I can use 5V in the engine compartment,
but... (TTWWADI - I know...)
Failure analysis... It won't be anything more mission critical than oil pressure...
I can hear RPM... Everything else is bonus data from where I am today. As
far as failure of this system affecting the rest of the airplane - pull the breaker
and shut it down.
Probably not exceeding physiological perception latency... I'm gonna have to remember
that one. My CGR30P's in the other airplane record at 3Hz. Data gathered
will be written to SD card... Probably won't store more than 10 hours of data,
Estimating 3-5 MB an hour so pretty easy on GB class SD cards.
Analyzing data... I do this with my CGR30's and dump it either into Excel or process
it with a chunk of C code to grab what I need and get what I'm trying to
learn that day / week / month / airplane.
I already display the MP and Timing on a 3.5 digit panel meter - want to get rid
of that. Filters pretty smooth. Planning on light filtering in HW to clean things
up and help the AD's out, then use SW filtering to get where I need to be.
Both are really cheap and good in their own ways.
Getting closer on the circuits via my re-education in electronics... Open for any
other thoughts or improvements... Anything I'm doing grossly wrong, or could
easily improve.
Planning on setting the ARef to 1.1V on the Ardunio. I think I have my voltage
dividers and filters about right. I have the 10V, 1.5ms RPM signal coming in -
I think the circuit I've put together will work for the digital Arduino input
- interrupt SW works, but I haven't tested this circuit against it. Fuel Press
and Oil Temp are the Westach 387-100 KV and 387-30 KV 0.5V to 4.5V sensors.
EOT is a Westach sensor as well 2190 ohms at 90F (about as low as I need to measure)
and 212 ohms at 212F. How can I improve the resolution at high temp without
giving up the range at the bottom end?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477191#477191
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| Subject: | Re: Electronic Ignition spark advance signal boost |
Hi All,
Quick question on hooking up the AD626 op amp board that Eric is so graciously
constructing for me.
I spliced a 22AWG ground wire to the main electronic ignition unit ground wire
about 4-5" where it exits the case. My question pertains to the fact that the
ground wire exiting the case is massive, about 12-14 AWG, so I'm thinking there's
a good bit of juice transiting that wire.
So, in splicing in my 22AWG AD626 wire (for V IN-) should I use a protective resistor
or diode on it before attaching to the AD626?
Yes, I'm still learning a lot of this stuff and would like not to be the one to
fry up a nice piece of work of Eric's! :?
Thanks,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477192#477192
Message 4
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| Subject: | Re: Electronic Ignition spark advance signal boost |
CORRECTION
Bob,
I missed this post earlier and noted your comment Re. this corrected diagram in
the other thread.
I'm hoping 4-5" from the case is close enough to tie into the ground wire for pin
1 input? As I mention in the other thread, for some reason the ground wire
on this unit is massive, around 12-14AWG.
Thanks,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=477193#477193
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