Anyone Tried the cheap N2k engine monitor on ebay?

As an update for me. I threw the CX5003 into a box to never come out again. Instead I have my ESP32 happily and accurately measuring the engine including the RPM. I did work on voltage with the tach, rather than frequency, but working very well. Will post some updates soon and now to tidy the code and have some real circuits printed.
 
for those who have RPM working with the CX5003, what sensor did you use? did you connect to the "w" terminal on the Alternator, use the existing Tach sender or create a second tach sendor somewhere

thanks
 
SV-Apres said:
for those who have RPM working with the CX5003, what sensor did you use? did you connect to the "w" terminal on the Alternator, use the existing Tach sender or create a second tach sendor somewhere

thanks
Click to expand...
I just used the alternator works fine after calibration.
 
Do you have an existing RPM gauge? do you plan to connect up your existing gauge and the CX5003?

if the answer is yes for both the questions above, then set the ration to '1' - all dipswitches on, then set the RPMs to 3 different points - 800, 1500, 2200 (for instance) using the gauge. see what value you get from the CX5003 and then determine the ratio - if you get 2407, 4578, and 6689, then set the ratio (in this case to 3)

at least this is how I intend to calibrate it
 
SV-Apres said:
Do you have an existing RPM gauge? do you plan to connect up your existing gauge and the CX5003?

if the answer is yes for both the questions above, then set the ration to '1' - all dipswitches on, then set the RPMs to 3 different points - 800, 1500, 2200 (for instance) using the gauge. see what value you get from the CX5003 and then determine the ratio - if you get 2407, 4578, and 6689, then set the ratio (in this case to 3)

at least this is how I intend to calibrate it
Click to expand...
Thanks. I wil try this. Why is it so many ratio settings on the box? 128 settings.
 
Ole Martin Nilsson said:
Thanks. I wil try this. Why is it so many ratio settings on the box? 128 settings.
Click to expand...

some engines use the alternator for the signal and that could be a relatively low ratio but some engines will use a proximity sensor that counts the teeth on the flywheel and that could be a lot of teeth per rev, so a high ratio. From what I understand from my 3GM30F engine the Alternator pulses at max rpm are in the range of 6500, which means it is likely to be a 2:1 ratio. But I will test using the method I described above to be sure. Incidentally, the 3GM30F comes with an encoder that feeds the original RPM gauge and runs with a much higher ratio, I will maintain this for the original RPM gauge
 
Hello everyone from Italy,

I bought the CX5003 to translate the data form my CAT3208 engines and I was able to set the dip switches after a lot of trying (if it can be usefull I can tell you my dip s. configuration but i have to see it tomorrow couse I don't remember it). The gauge are VDO, one inside the boat and one on the flybridge and the CX5003 works fine in parallel with them. I'm not sure but maybe, if I had disconnected them, it would have worked right away without needing to change the dip switch setting.. I don't know.

Anyway, with the right setting (fonund by attempts), the RPM are perfects, 670 idle, and 2800 at wot.

My problem arrived with the oil pressure and temp. I don't know why but there is no data to collect by nmea network. I hope that the problem comes from the other gauges in parallel.

I think I have tried to disconnect one of them (the one on the flybridge where I was installing the CX) but surely I didn't disconnect the other one.

Do you think the issue could be this?

Many thanks in advance! (and sorry for my english)
Mirco
 
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