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  CanopusNav Configuration Notes
Posted by: affinite - 03-14-2018, 06:31 AM - Forum: How I did it - Replies (2)

I am a huge fan of the OpenPlotter project and have been learning and experimenting since the early days.
Technologies such as SignalK, NodeRed, JavaScript, ESP8266 MCUs etc have been a revelation to me but at times they have blown my mind!
Experimenting has taken me down so many paths and resulted in so many "tweaks" to my OP computer, that I felt I needed to start documenting my configuration in case I ever wanted to rebuild from scratch.

My configuration notes are definitely Work In Progress but I have linked to them below in the hope that it may be of some use to someone.


The document currently only covers my use of ESP8266 MCUs as wireless senders for my boat systems but will be expanded to cover my OpenPlotter and NodeRed setup in due course

I currently use ESP8266's to send important boat systems data to my NodeRed dashboard.
Parameters measured include:

Fuel Level
Fresh Water Level
Waste Water Level
Start Battery Voltage and Current
House Battery Voltage and Current
Thruster Battery Voltage and Current
Solar Panel Voltage
Key Engine Temperatures

All data is sent over MQTT and displayed in NodeRed or on my phone via a public MQTT broker
I've used lots of ideas from lots of people on this forum so if you recognise your work in my config - Thanks  Wink

  RPI, OpenCPN and buzzer
Posted by: Douz - 03-13-2018, 04:16 PM - Forum: General discussion - Replies (20)

Je voudrais avoir un buzzer au lieu de la sonnerie de l'alarme AIS. (Je n'ai aucun amplificateur).
Je pensais que c'était simple avec GPIO, mais en fait, je ne sais pas comment faire ça.
Une idée?

  NMEA Converter
Posted by: knowconcept - 03-13-2018, 03:26 PM - Forum: How do I...? - Replies (9)

I use Open CPN on Windows with the NMEA Converter just fine.  I have installed Open Plotter on Raspberry Pi with no problem.  How can I install the NMEA Converter onto my Rasb Pi?  I am using the plugin for R&D on our new electromagnetic FWD and LEE velocity transducer.    Any help would be greatly appreciated.  


  wiper motor drive unit
Posted by: seandepagnier - 03-11-2018, 06:02 PM - Forum: General discussion - No Replies

The wiper motor is more efficient (1 amp) than a tp22 tiller pilot (1.4 amp) and the movement is faster.

These motors are widely available, designed for continuous duty, and this one cost $25.

To adapt for a wheel drive is even easier, it would just need a belt.

  UDP receive and vnc stop working after approx 10 min
Posted by: wmrae - 03-10-2018, 02:17 PM - Forum: Bug Reports - Replies (3)

Apologies if there is a solution already, I did my best to search but I am new to the community...

I have a Pi 3 running 0.17 ( installed image on card and then ran all updates) 

Pi has a tested good power supply (2.2a), logitech wireless keyboard/mouse dongle attached and an HDMI monitor

I am not using AP mode and instead am connected to the boat's existing wifi using the pi3 integrated wifi. I have another computer on the network running OpenCPN and transmitting all NMEA data over udp.

When the Pi first starts everything is great, the UDP stream is successfully read in and I can connect over VNC. about 10 min later the stream stops coming in and I can no longer connect via vnc however the wifi connection is still good and I am able to use the browser on the pi to view webpages and ping the other machines on network. I have also verified with an additional computer that the udp stream is still being sent at this point, just not seen by pi. The only way to bring everything back at this point is to reboot the pi.

I read several threads about wifi power management and have experimented with turning it on and off with no change in behavior.

Looking forward to any suggestions 


  Hall Effect Current Sensors
Posted by: abarrow - 03-10-2018, 11:52 AM - Forum: General discussion - Replies (1)

Does anyone have any experience with Hall Effect current sensors? I'm looking to replace my big shut-based current measurement system.

I've seen a couple of types of these - some that are a ring that fits around a power wire, and others that are a breakout that basically looks like a circuit board with some really big traces and a high-current chip that does the measurement. Since I'm trying to cut down on the number of connection points in my high current circuits, I'm thinking I'd like to go for the ring type, but I'd like to hear if anyone else has tried this.

  {SOLVED} Convert Lat/Long Dec to Deg & minutes
Posted by: affinite - 03-10-2018, 10:31 AM - Forum: Node Red - Replies (3)

Does anyone know how to convert Latitude and Longitude from "Degrees,Decimal Degrees" as output by SignalK to "Degrees,Minute,Dec Minutes" ?
Node Code would be great if you have it  Big Grin


  NMEA to SignalK key assignments
Posted by: affinite - 03-10-2018, 10:01 AM - Forum: How do I...? - No Replies

Can someone tell me where I can look up which SignalK keys are assigned to which NMEA header?

For example the "MWV" and "VWR" NMEA sentences both include the "Apparent Wind Angle" header but in SignalK it could be assigned to /vessels/<RegExp>/environment/wind/angleTrueWater or could be assigned to /vessels/<RegExp>/environment/wind/angleTrueGround

Where can I find which SignalK key is assigned to AWA in the OP SignalK server?

I've looked through the SignalK.org site but cant find it documented.


  High pressure sensor (~150) bar in OP?
Posted by: ottow - 03-09-2018, 02:52 PM - Forum: How do I...? - No Replies


A friend wants to monitor his onboard hydraulic system, with a bow thruster and anchor windlass using OP.
Temperatures is easy, but pressure is a bit harder it seems, with normal pressure at around 150bar or so.
All references to pressure sensors I am finding here is for atmosphere (air pressure) monitoring, possibly meaning no-one has done this with OP?

All tips and ideas welcome,


  GPS data on LCD 20x4 Screen
Posted by: Osiyeza - 03-08-2018, 11:16 AM - Forum: How do I...? - No Replies

Hello everyone.
We wish to equip it with DIY electronics.

The OpenPlotter solution seems to be the most complete and adaptable.

During our research we have also found a RPI 3 program called OnBoard Computer System, but it doesn't satisfy us completely.
However we want to keep a 20x4 LCD screen with 3 screens with which we can read all the information.
We'll adapt it on a RGB LCD screen that will have a red backlight at night.

We are trying to write the code, but it is long and difficult.
Because we don't know where are register the OpenPlotyter data ? (signal K ?).

Would someone have the python database address?
Does anyone already have a code for this kind of display?

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[Image: ocs_photo_05.jpg]