Raymarine E7d Manual

[Pascua Gomer]

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With this configuration the Cerbo does not appear on the Axiom and I to lose AP comm as well. I've tried both VE Can ports on the Cerbo, with and without a terminator, I've set the VE Can port to 250kbps. In the Cerbo setup page, two ports are available but there is no physical mark on the device to show which port is which, nor do I find anything on this in the manual.

I'm having real trouble getting tank data to appear on my Raymarine Axiom (latest software update). My config is CerboGX with Tank140 and I have BEP ultrasonic tank level monitors on ports 1 and 2 of the Tank140.

I can happily see the tank level data appear on the Axiom's diagnostic pages but they show with data instance numbers of 10 and 11. I edited the instances on the Cerbo to 0 and 1, however this makes no difference.

I am working on a system that will collect wind speed and direction from an older Raymarine ST60 style sender. The reasons for using this sender are varied, but one good reason is that they are extremely robust, giving 20 years or more of service without problems.

The Raymarine sensor also gives direction, using variable voltages representing sine wave coordinates on the x and y axis, this part of the project is not included here as it was easy enough and mainly involved a few simple maths functions.

Now I have been running some tests on the sensor by putting on a pole on the roof of the car, well forward in clear air, and getting some speed vs frequency data. I will need a calm day for good tests, and tomorrow looks good. In the interim I have some decent data up to 60 km/h, but I noticed some odd results which I'd like to share, along with the code, for comments.

Please note that the above data does not include acutal car speeds. This will be manually recorded by my passenger tomorrow when we do the still air testing. As nice as it would be, it was a bit complex to interface the gps puck into this project.

I think that you should store the value in another variable, e.g.: frequency. Beside using the same var with two different meanings, here it's dangerous because your interrupt could trigger in the middle and overwrite it again.

And you mention milliseconds in the comment, then why 100000 instead of 1000? or maybe 1000000.

But if the interrupt triggers with the falling edge only, shouldn't it be one pulse per revolution?

And you shouldn't need the debounce in the interrupt, I think, if the signal is a clean square wave from the comparator.

So, it turns out the lm393 will faithfully reproduce the same mess being produced by the sensor. I THOUGHT the signal would be clean but it turned out to be pretty messy. Quite a few grey hairs before I figured out what was going on.

The milliseconds conversion has me worried... I'll look into why the heck I added the zero, and, more importantly, why it hasn't shown up in the final output. Surely I should have a ratio of 10 to 1 in the two outputs.... odd...

Your data from calcFrequency looks odd - few significant digits and lots of similar results. This apparently because you're simply dividing the pulse count by six. The count is integer, so the result/6 doesn't give much variation.

So, when you are in the last line, AverageInterval could have been modified again by the interrupt.

Probably the chances are small, because the frequency is very low and the loop is faster in comparison. But it will happen.

Beside that, there are some things not clear to me in the code, probably because I don't understand it correctly.

My main concern is the results you get. If I understand right you measure the frequency in two ways (correct me if I'm wrong):

So the value in one column should be exactly double than the value in the other (if I don't miss anything with the conversions). Correct? But this is not what you get.

If this is the case, there are other topics that could produce the discrepancies. For example the way that you count the 3 seconds in the loop.

And as commented by wildbill, to test and fine tune the system, it would be easier if you generate and inject a pulse with another arduino. Or install it in a manual wheel or something like that. To save patrol and tires

Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?

Hand drawn and photographed is perfectly acceptable.

Please include ALL hardware, power supplies, component names and pin labels.

Then perhaps your debouncing isnt as effective as it should be.

I'm a bit out of my depth here so maybe someone will be able to put me right; Can the ISR get interrupted?

The ISR calculates BOTH the Average Interval and the pulses. So they SHOULD both give exactly the same results provided your later calculations are correct.

Generally CalcFrequency (based on pulses) is high, so it looks as if there are additional pulses being counted.

What electrical contacts require denouncing? It appears to me that magnets and a Hall effect device are used to create the output pulses. It seems to me that the debouncing is ignoring valid pulses and completely invalidates the data collection.

Are you sure that the wind speed transducer is still functioning? The Raymarine Wind Transducer has 12V power input and comes from the factory with either a 30m or 50m cable between the transducer and the head unit. Nothing about this indicates to me that the output signal requires amplification for 5V detection within 10 feet of the transducer. Have you checked the output pulses with 12V supply voltage? Seems to me that a resistor divider circuit should be more appropriate than an amplifier to interface it to an Arduino.

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Raymarine, a Teledyne FLIR brand, makes high-performance marine electronics for the recreational boating and light commercial marine markets. With a legacy of marine navigation technology spanning over 80 years, Raymarine products are renowned today for their ease-of-use, rugged design, and reliability. We are continually innovating to deliver best-in-class sensors and intelligent navigation systems - making boaters' time on the water safer and more fun. Our range of marine electronics are available through a global network of dealers and distributors. For more information, visit www.raymarine.com.

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