Jabiru7252

Okay, after a short break to do other things, I completed the prototype EGT monitor. Because the thermocouples are fed into differential amps, they cannot be electrically connected together as they would be when all attached to the aircraft engine. (We have the wrong type of thermocouple interface board?). The solution was to switch a thermocouple in, do a read, then move onto the next thermocouple using relays. This works well, each thermocouple sensing the temperature as expected (100°C in boiling water). There is a further problem, I wonder who can guess what it is. I shall work on that shortly...

Our newspapers have become so trashy and amateurish it's a joke. And the spelling and grammar is pathetic. Let's hope our fellow pilot at Cobdogla comes out of this okay...

The rotary switch was only to test a theory. If the error is small (millivolts or even several volts, who cares considering we will be looking at maybe 600°C and the error would be the same on all four probes. Thanks for your comments...

Here's an idea (for those still listening). I could use four solid state relays to switch the input to each probe in turn and only need one of the MAX31855 channels. We know switching works because we did it with a ordinary hand cranked rotary switch.

The 3 volts versus the 5 volts is a big thing, okay, please explain how it relates to the problem I posted. If I have it wrong, how come all works as well as it does? What is there in the code posted by Kyle that may fix the problem? I'm the learner here, not the teacher. If my posts offend, throw money on my roof, I hate that....

Let's not digress; unless you think the 3 or 5 volt thing is causing the problem.

here's the code.... /* EGT-monitor-v4 Version 4.0 This version extends version 3.0 by using all the theromcouple lines and no serial port. WORK IN PROGRESS!!! Kevin Thomas, 24 Jan 2016 */ #include <SPI.h> #include "Adafruit_MAX31855.h" #include <LiquidCrystal.h> // defines what pins on the MAX31855 board connect to what pins // on the Arduino board. int MAX_SO = 6; int MAX_CLK = 7; int MAX_CS0 = 8; int MAX_CS1 = 9; int MAX_CS2 = 10; int MAX_CS3 = 13; // create four instances of the MAX31855 board, one for each // thermocouple. Adafruit_MAX31855 maxboard0(MAX_CLK, MAX_CS0, MAX_SO); // on pin 8 Adafruit_MAX31855 maxboard1(MAX_CLK, MAX_CS1, MAX_SO); // on pin 9 Adafruit_MAX31855 maxboard2(MAX_CLK, MAX_CS2, MAX_SO); // on pin 10 Adafruit_MAX31855 maxboard3(MAX_CLK, MAX_CS3, MAX_SO); // on pin 13 // create an instance of the LCD display. LiquidCrystal lcd(12,11,5,4,3,2); void setup() { lcd.begin(16, 2); lcd.clear(); lcd.print(" EGT-monitor-v4"); delay(5000); lcd.clear(); } void loop() { int T1 = maxboard0.readCelsius(); int T2 = maxboard1.readCelsius(); int T3 = maxboard2.readCelsius(); int T4 = maxboard3.readCelsius(); // the lcd. (col/row format) lcd.setCursor(0, 0); lcd.print("T1= "); lcd.setCursor(3, 0); lcd.print(T1); lcd.setCursor(9, 0); lcd.print("T2= "); lcd.setCursor(12,0); lcd.print(T2); lcd.setCursor(0, 1); lcd.print("T3= "); lcd.setCursor(3, 1); lcd.print(T3); lcd.setCursor(9, 1); lcd.print("T4= "); lcd.setCursor(12, 1); lcd.print(T4); delay(1000); } I don't have the hardware with me as I wrote the code for a fellow aviator.

Okay, we have an Arduino reading four EGT probes via a four channel MAX31855 board. The temperature on each probe is being displayed as expected but when the probes are immersed in a saucepan of hot water, all four readings drop to zero but of any one probe is in the water it reads as expected (proving the water is not shorting out the probe). If the probe cables are touching those probes read zero. So, are YOU familiar with this and how did you fix the problem. I have a few ideas but would like YOURS first.

Man I am dim, I simple don't get this!

I record audio using a small digital audio recorder. Plugged into the passengers headset socket via a resistor network (10K and 1K). Works well. I then combine the audio with my video during the editing stage. I use Sony Vegas 12 for video editing. Only pilot and radio traffic recorded, no engine etc. The engine sound is recorded on the video recorder and I can turn that down. To align the audio with the video I use the distinct click that occurs when letting go of the PTT and watching the LED on the dash.

I sometimes think these mandatory inspections are a money spinner and cause more problems than they prevent. However, that's just a thought and I may not be thinking straight because of the extreme heat.

Twice I have flown to Kadina SA and both times the wind was flat out and 90° across the runway. I had a go the first time but it was pretty rough so I chickened out a came back home. The second time I didn't bother as the first time was still fresh in my memory. I also prefer cross-winds from the left, dunno why...

Doesn't work:oops:

It's when they get it wrong and you're dragged off screaming and naked into the night after being accused of some heinous internet crime you never committed.

Well, I had a friend who refused to have his kids vaccinated (way back in the 70s) and even had them born at home because he believed that 'The Government' was collecting blood samples etc. for some yet to happen event or experiment. Google (and others) collect brazillians of giga-bytes of data on each of us yet we happily use the internet in ignorant bliss (well, most of us). I still say for everything they know about YOU there's probably ten things they don't know. I just wish they could get their data-analysis right. I have NEVER been on a dating site or trolled for sex yet I get some trollop, three kilometers down the road pop up on my screen saying she wants to (sounds like duck) me. Or, how some silly old fool has the best abs in the world for his age.

May not be able to shoot them, but I remember a fellow caught trying to steal a car.....

I recommend having a deep hole dug somewhere, it may come in handy.

I don't have an ASIC and won't bother with one. As pilots our certificate or licence should be enough while 'behind the wire'. If I had the need to fly into ASIC controlled airports then maybe I'd get one. They are just a money spinner. The ASIC will not in any way stop the lunatics from doing anything bad. There was a time when the whole family could walk up to the steps at the plane to give the old man a hug as he went interstate for business. How times have changed.

Whoo, gonna be lumpy flying tomorrow, 35°C.

Well, the Gawler thingo drew quite a crowd and a few interesting planes to drool over. I'm glad I went.

I like the contour. Mine handles the propeller chop better than the Go-PROS that I have seen. As for 4K video, why bother? You need a 4K display to make the most of it and a super computer if you intend doing any serious video editing.

Yep, RH circuits. The tighter circuit is the ideal circuit, the rest were a bit wide. This is because I was just starting out in the Jabs after previously flying the Tabago TB10 and Piper PA28 .

Here's a sample of my circuits from about 5 years ago.....

Did you run over a yellow-bellied-sap-sucking-gound-warbler when landing? They sound like that.

Not being on FaceAche I guess I miss out. Oh for the days when folks ran websites instead of exclusive facebook etc.