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Latest Threads
Connect two i2c sensors i...
Forum: How do I...?
Last Post: jim321
5 hours ago
» Replies: 4
» Views: 23
Forum: General discussion
Last Post: jim321
7 hours ago
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» Views: 10
V1.2.0 : Update kernell a...
Forum: How do I...?
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11 hours ago
» Replies: 1
» Views: 17
new project boat
Forum: General discussion
Last Post: Max1947
Yesterday, 10:56 AM
» Replies: 5
» Views: 43
Server Hardware for openp...
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Last Post: Max1947
Yesterday, 10:40 AM
» Replies: 3
» Views: 20
Booting from USB
Forum: How do I...?
Last Post: mikedeflieslife
Yesterday, 10:07 AM
» Replies: 15
» Views: 54
Sometimes OpenCPN config ...
Forum: Bug Reports
Last Post: Barentsailor
05-17-2019, 12:35 PM
» Replies: 6
» Views: 26
Delete old serial config
Forum: How do I...?
Last Post: fishy
05-16-2019, 01:21 PM
» Replies: 7
» Views: 21
OpenPlotter v2.x.x is com...
Forum: General discussion
Last Post: verkerkbr
05-16-2019, 06:37 AM
» Replies: 27
» Views: 194
Moitessier HAT compass fa...
Forum: General discussion
Last Post: fishy
05-15-2019, 02:28 AM
» Replies: 2
» Views: 14

Posted by: svBlueMoon - 8 hours ago - Forum: General discussion - Replies (3)

I'm trying to build the weather sensor in the "arduino" section. Being fairly green at compiling code I can't resolve a complie error in the IDE.
Running the compiler I get "~\arduino\weathersensors\weathersensors.ino:34:19: fatal error: twi.h: No such file or directory

   #include <twi.h>"

I'm sure it's the line 33
"extern "C" {

  #include <twi.h>

Snooping through othere files I saw a comment that the built-in twi.h in the arduino wire library doesn't do a required pull-up needed.
That's where the greenneess takes over. Where is it lookng for this file and how do I go about installing all the dependancies required? I ran the makefile (another foggy area) but that didn't resolve the issue. 

Thanks for any help.

  V1.2.0 : Update kernell and Raspbian and ... ?
Posted by: Didier B - Today, 02:11 AM - Forum: How do I...? - Replies (1)

It seems V2 is for tomorrow, or the day after, or... Can't wait !

Could experienced users give us a quick guide to safely update what has to be updated ?

Many thanks in advance !

  Connect two i2c sensors in OpenPlotter 1.2.0
Posted by: Barentsailor - Yesterday, 05:22 PM - Forum: How do I...? - Replies (4)

Hello there,

I have an issue with two i2c sensors: an MPU9255 and a BME280. Both of them are connected in parallel to a raspberry 3b+ with OpenPlotter 1.2.0a. However only data from the BME280 is received when both sensor are connected. If I disconnect the BME280 I can then receive data from the MPU.
So both sensors independently work fine and run on two different addresses, 0x76 and 0x68. In the i2c tab they are both shown, and when the BME280 is unplugged I can calibrate my MPU on the pypilot tab. But I can't receive data from both of them at the same time...
I don't see what the problem can be, some help would help :-)

  Server Hardware for openplotter?
Posted by: glowntiger - 05-17-2019, 07:58 AM - Forum: General discussion - Replies (3)

Hi Guys,
at the Moment I use Openplotter at my sailboat.
I have several NMEA0183 an a N2K device on it.
I´m not afraid of my installation. all is "tinkered together"
I design and sell in part time next to my job pcb for homeautomation. 
I think about to design a PCB with "all on board" first for me but I also can imagen to sell it as open hardware (with CE)

What I want to ask here:
Is anyone intrested in somthing like that?
I search one who can make "the software side" so if anybody uses the board all runs out of the box? (I put the hardware ;-) )

For further Prices I think such a board is about 60€ without case and connectors.

I imaging somethink like that:

On the I2C conector you can bind several further I/O Modules like analog, digital In/out and so on.
Information an a overview of my hardware you found here:


  Delete old serial config
Posted by: fishy - 05-15-2019, 05:54 AM - Forum: How do I...? - Replies (7)

Hi All,

Now that my new Moitessier HAT seems to work nicely (yayy) I'd like to remove the old serial connection of the USB gps

It sits in the 'Serial' tab in OpenPlotter, and when I click 'delete' and 'apply' the name goes away, but the rest remains. I'm a bit worried that it sitting there is  hint of another configuration problem, and I'd like to keep everything s simple as possible..

Is there a way to get rid of it completely?

  Moitessier HAT compass faulty?
Posted by: fishy - 05-14-2019, 08:53 AM - Forum: General discussion - Replies (2)

Hi All,

After testing my new HAT on my OpenPlotter 1.2.0, pi 3b setup I must say AIS works great, pitch / roll work fine, but the compass is a big disappointment.

Since OpenCPN apparently only re-draws the heading of my ship-icon when I force a refresh by zooming out / in, I added a dashboard to show mag hdg, pitch, heel

Pitch and Heel show reasonable looking data, but the compass always seems to crawl back to a value between 70 and 90. When I rotate the pi, it may briefly go up to 350, or down to 5, but then within seconds it's back to , say, 80.

Although I am testing indoors, there are no large metallic objects nearby (with a couple of meters)

What am I missing here?

Thanks for any tip on this!

  MQTT String payloads to Integers for use in KIP gauge
Posted by: KKempeneers - 05-12-2019, 12:40 PM - Forum: How do I...? - Replies (2)


Is there a way to alter the incoming MQTT datatype (defaults to string) to integer? This is needed because I'm building an interface for the engine in my boat. I would like to publish RPM, coolant temperature and oil pressure to MQTT en display them using the fancy gauges in KIP. These do not accept the string data that was received and linked to SK.

Kind regards,


  MQTT data manipulation
Posted by: KKempeneers - 05-12-2019, 09:38 AM - Forum: How do I...? - Replies (13)


I'm building a network interface to get data from my engine (RPM, coolant temperature, oil pressure) to OpenPlotter. (Just for the purpose of displaying it with KIP). I thought the easy way to go would be MQTT ...

So I build an application that posts the data to an local MQTT broker (localhost on the RPI running OpenPlotter) So far so good. Everything works like a charm, I can see my updates in the Diagnostic Signal K input window. 

Problem is however the data transmitted over MQTT are treated as text variables and i can't select the fancy gauge's in KIP to display my engine data. 

I guess my question is; is it at all possible to convert the MQTT data back to numeric data for display in KIP? 

I'm using an RPi-3, the interface connects over WiFi

Kind regards,


  Display Signal K data on Kobo Simple browser ?
Posted by: NahanniV - 05-11-2019, 08:24 AM - Forum: How do I...? - Replies (4)

I have a couple of waterproof sunlight viewable Kobo Aura H2O e-readers aboard.
They have a built in browser.

I am running the OpenPlotter Distribution (with Signal K server) on a Rpi.

The only SignalK webapp I have found that can be displayed in the Kobo browser is Sailgauge, but it refreshes so often that it is not pretty on the E-Ink display.

I'm wondering if there is a simpler WebApp that might work with the Kobo browser ?
I'd be happy with something that would display SOG, DPT, AWS, AWA as text.

John Middleton.

  END KERNEL PANIC - NOT SYNCING: ATTEMPETED to kill init! exit code=0x0000004
Posted by: pgorab - 05-09-2019, 08:38 AM - Forum: General discussion - Replies (3)

Hello Sailors,

I am usig RPI 3 and the official raspberry power supply. I flashed and OP 10 image in a SD card (512Gb, formatted with SD Formatter and then transformed in FAT32 via diskutil console command in a Mac) and inserted the SD on the PI. I got the END KERNEL PANIC - NOT SYNCING: ATTEMPETED to kill init! exit code=0x0000004 and the system does not booting. (please see attached screen print)

I was using OP 8 before and installed the 10 version and had no problem like it before.

Please can somebody help me to solve it?

Thanks a lot!



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