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TOPIC: NMEA Bluetooth To Tablet For Wireless Operation

NMEA Bluetooth To Tablet For Wireless Operation 4 years 10 months ago #8182

  • Guido
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I've done it both. Data over bluetooth and nmea over wifi.

The trick is the right configuration. you should have correct baudrate, correct port. And so on.

Start with the base:
Connect it directly wired, then you see, a lot of times it doesn't work wired, then it will never work wireless.

If it works, cut the wire and connect your bluetooth devices. same baudrate!!!. send on receive, receive on send.

Activate and normally it works.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 10 months ago #8189

  • Darren
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thanks Guido
for my setup wired works, wifi doesn't. (baud rate settings are the same)

the issue may be with my serial to wifi data transfer box.

Can you tell me what wifi hardware you used?
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 10 months ago #8194

  • Guido
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I use an Alfa N5 for the Ethernet. Next to the N5 I use another box serial over ethernet. I'm going to check out the exact number and name.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 10 months ago #8197

  • Guido
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Sorry it took some time. To get nmea over ethernet I use the ATC 1000
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 10 months ago #8202

  • Darren
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Thanks Guido!

I think my issue was that the serial to wifi data transfer box I was using only worked for RS 232 and not RS (the format used by Lowrance).

How much did you spend to implement this?

Can I ask what your setup is and what you are using the depth data for? (Boat/Electronics)
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 10 months ago #8206

  • Guido
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I did spend about 400 Euro. Upcomming day's I'm busy. I try to make a scheme from my setup next week.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 9 months ago #8393

  • longjohn119
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You may want to check out my blog. I got an Elite Ti 7 last year which is really an HDS7 Gen 2 with built in Go Free Wifi but not ethernet connections. I have my own GPS with remote active antennas so the antenna sit right over the transducer which eliminates the +/- 2 meter error (Or more depending on size of boat and location of finder in regards to the transducer.

I have the GPS module ( < 20USD) controlled by an Arduino Mega that was originally set up as a NMEA Multiplexer and Logger for my old finder that only had the basic NMEA depth sentence but since I do all my logging to the Elite Ti for what should be obvious reasons (LOTS more than just a NMEA Depth sentence) I converted it to a "GPS Server" which outputs the GPS positional data via USB, Bluetooth and to RS-422 Serial for the Elite Ti NMEA input. When I turn it on the Elite automatically uses it and if s off then it automatically switches to the internal. I also have the Elite's NMEA RS-422 serial output going to an ESP8266 WiFi module and use a 15 USD portable wireless router to form a NMEA data network accessible by any device with WiFi while just the GPS data only is available by any device with Bluetooth

I even found an undocumented browser and FTP interface that can be used to move data to and from the unit via the magic of WiFi

The Netbook2Chartplotter Project - A blog on fishing, mapping and electronics
Last Edit: 4 years 9 months ago by longjohn119.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 9 months ago #8395

  • Matt
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longjohn119 wrote:
You may want to check out my blog. I got an Elite Ti 7 last year which is really an HDS7 Gen 2 with built in Go Free Wifi but not ethernet connections. I have my own GPS with remote active antennas so the antenna sit right over the transducer which eliminates the +/- 2 meter error (Or more depending on size of boat and location of finder in regards to the transducer.

I have the GPS module ( < 20USD) controlled by an Arduino Mega that was originally set up as a NMEA Multiplexer and Logger for my old finder that only had the basic NMEA depth sentence but since I do all my logging to the Elite Ti for what should be obvious reasons (LOTS more than just a NMEA Depth sentence) I converted it to a "GPS Server" which outputs the GPS positional data via USB, Bluetooth and to RS-422 Serial for the Elite Ti NMEA input. When I turn it on the Elite automatically uses it and if s off then it automatically switches to the internal. I also have the Elite's NMEA RS-422 serial output going to an ESP8266 WiFi module and use a 15 USD portable wireless router to form a NMEA data network accessible by any device with WiFi while just the GPS data only is available by any device with Bluetooth

I even found an undocumented browser and FTP interface that can be used to move data to and from the unit via the magic of WiFi

The Netbook2Chartplotter Project - A blog on fishing, mapping and electronics

Cool stuff and nice blog!

Is your GPS module capable of logging raw data and, if so, have you tried post-processing that for better accuracy? I came to the conclusion that "on the water" accuracy is of less importance when mapping than than the accuracy of logfiles - which can be improved by post-processing if raw GNSS data is logged. We have been experimenting with L1 RTK (single channel) which has been giving really impressive results - perhaps in the order of a few cm. Running 2 x receivers can give extremely accurate headings also. Take a look at this forum post for an example. We have written a small utility that takes the sonar logfile and an independently logged set of RTK logfiles and synchronises them (brute force, minimising differences which works surprisingly well). Eventually this will be part of RM2, but not the first release. The GPS data we have been logging is accurate enough to use for tidal adjustments. Certainly, accurate headings (in particular) and position can make a very big difference to the quality of sidescan mosaics.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 9 months ago #8397

  • Matt
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I should probably add that one very strong reason for logging independently of Lowrance units (in particular) is that they log positional data to an integer Mercator metre format, so even with the best of GPS sources, accuracy is ultimately going to be limited to a metre at best.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 8 months ago #8416

  • Darren
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Nice Blog longjohn119 & thanks for sharing on the IOT!
Last Edit: 4 years 8 months ago by Darren.
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 6 months ago #9026

  • longjohn119
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Matt wrote:
[
Cool stuff and nice blog!

Is your GPS module capable of logging raw data and, if so, have you tried post-processing that for better accuracy? I came to the conclusion that "on the water" accuracy is of less importance when mapping than than the accuracy of logfiles - which can be improved by post-processing if raw GNSS data is logged. We have been experimenting with L1 RTK (single channel) which has been giving really impressive results - perhaps in the order of a few cm. Running 2 x receivers can give extremely accurate headings also. Take a look at this forum post for an example. We have written a small utility that takes the sonar logfile and an independently logged set of RTK logfiles and synchronises them (brute force, minimising differences which works surprisingly well). Eventually this will be part of RM2, but not the first release. The GPS data we have been logging is accurate enough to use for tidal adjustments. Certainly, accurate headings (in particular) and position can make a very big difference to the quality of sidescan mosaics.

It is (or I should say was) a NEO-6M so it could if I reprogrammed it. What I have been doing before I got the Elite 7 Ti last year was logging several NMEA sentences especially the one that has the PDOP, VDOP, and HDOP data and then run the data through a Python script that I got from a friend who works for the USACE Rock Island District which covers half the Upper Mississippi River (The part with the locks and dams) and you basically input your acceptable levels for each setting and it goes through and culls out the high xDOP sentences along with everything else with that GPS timestamp as invalid data because the GPS fix just wasn't good enough

However I just got a NEO-M8N module which is capable of picking up the Russian GLONASS 'birds' and in my test setup which simulates less than ideal conditions ( Basically an active puck antenna sitting on the sill of my west basement wall with a big maple tree out front and an even bigger oak tree, like I said less than ideal conditions) and I average 8 US birds and 3 Russian birds. This thing is going to freaking rock out in the open in my boat. This module is also able to accept RTK correction data and I just found out the state runs a RTK network with close to 100 stations covering the state for the farmers. I also found out AT&T Wireless is offering a prepaid SIM for IoT applications (Like a remote weather station) for $10 bucks and it lasts for 6 months or you use 500 MB of data over the 2G network, basically enough to last me an entire season since the correction data does use up a lot of bytes. I'm going to get one of those, stick it in an old smartphone I have and then send it via Bluetooth Serial (SPP) to my unit (I knew there was a reason I stuck that Bluetooth module in their last year)

If this works as I expect it should I'll basically be out 30 bucks for the GPS module, and 10 bucks for the SIM and with the stuff I already have I'll have a centimeter accuracy RTK system on my boat . I can pretty much set up and test everything via Wifi here at home and work all the kinks and bugs out and then get the SIM and just have it grab the internet from the cellular data connection instead of the Wifi (Actually I should be able to use both) You can also buy GSM shields for Arduinos to replace the cellphone but I'm currently using it for Bluetooth controlled robots and robotic arms I make with my 3D printers anyways. I'm really temped to get another one of these with a built-in patch antenna (Even cheaper, around 20 bucks) and put it on the WASP II which has a Class 1.5 (40-50 meter range) Bluetooth 4.0/LE dual Bluetooth module which is an upgrade to my original mapping aquabot .... here ... and here
Last Edit: 4 years 6 months ago by longjohn119. Reason: Poor proofreading skills ....
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NMEA Bluetooth To Tablet For Wireless Operation 4 years 6 months ago #9028

  • Terrible45
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Good blog and nice job John !!!
Terrova 55 lbs BT 2017 / I pilot Link 2017 / 360 ° Imaging
HELIX CHIRP 10 MSI G2N
Sponso Navicom (Humminbird / Minn Kota ) France Soft:Reefmaster 1.0 & Autochart Pro
Panasonic CF19-MK5 for mapping on live
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