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1. 06:11 PM - HomeBrew Engine Monitor (andymeyer)
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| Subject: | HomeBrew Engine Monitor |
So, A few years ago, a friend gave me an 8 channel EGT/CHT system that displayed
on a small 2.8" screen that was stuffed in a 5"x5"x2" box. A pain in my EZ,
but it gave me EGT/CHT. I added a panel meter to display MP.
Come the day of Arduino... I'm addicted, but a bit over my head in some of the
electronics - doing my best studying data sheets, etc..., but would love a second
or third set of eyes on what I'm doing. Overall plan - full fledged engine
monitor. 8)
So far - DAQ in back by the engine - A Teensy 3.6 spewing serial data via a MAX3232
to the cockpit.
8 AD8495's to read the thermocouples - I went this way since my thermocouples are
grounded. I almost went with the MAX31855, but that's not for grounded thermocouples.
2 analog channels to read the voltages from the Lightspeed ignition for MP and
Timing. 0 - ~0.5V signals
1 PWM channel to read RPM from the Lightspeed (10V PWM signal.
1 voltage divider to read the 5V oil pressure (EOP) signal at ~3 volts...
1 resistor divider to read the oil temp (EOT) thermister or RTD... I have a westach sender right now, plan to keep it. http://www.chiefaircraft.com/wes-399ot.html
1 spare resistor divider for carb heat in the future.
2 spare 3.3v analog ins for future fun. Any ideas here?
The Teensy 3.6 uses the two long lines of headers to mount right on top of the
base board... Skip a few pins on the left side to simplify routing...
This will send RS232 data up to the instrument panel to a Teensy4.0 driving 2 2.8"
cap touch screens. I've already got the breadboard for the displays working.
The Teensy4.0 will also collect fuel flow, air temp, Volts and Amps, and read
aviation data from the GPS.
I have an air data computer (Pitot, Static and temp) that will spew serial to my
Avidyne IFD540 and to the Teensy4.0 for fuel economy calculations, TAS, etc...
I designed the air data computer, but it was pretty basic. My magnetometer so far
has been a fail - can't get it to calibrate. :? I want to pull the trigger
on this board, but would really appreciate any inputs that the collective expertise
here may have. I'm way beyond myself on this one... I'm also more than willing
to share my design and code if that's of interest.
I designed this in Fritzing - easy for a hack to learn. Started trying Upverter,
but progress was slow so I went back to Fritzing.
Questions:
Is my ground plane right? Tried to split analog and digital...
Am I asking for trouble with any of my signal routing?
Resistor and cap values logical? Any reason not to use 1% resistors on a small
project like this?
The 10uF power supply cap - tantalum? or is there a better option for this these
days?
Files are located at:
https://drive.google.com/open?id=1Ue5_RDt7YqWEHsvDSzuea_owb4BEpKAi
Thanks!
Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=493701#493701
Attachments:
http://forums.matronics.com//files/jlcsmt_sample_bom1_194.xlsx
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