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Also send I2C sensor data to Node-Red so ALL instruments show on the dashboard
#1
Hello all, long overwhelming message coming up.. Hopefully Node-Red is my way out

(If you feel like TL-DR, the important questions are in bold)

So in the past few weeks, I have read so many websites about concepts, communication protocols, documentation and I still don't understand 90% of what people are talking about on this forum, or what OP does "exactly".. I don't get it, I'm a software engineer and I feel stupid haha! Everybody seems to understand perfectly what spaghetti all these protocols and terms build togheter: MQTT, i2C, NMEA0183, NME2000, 1W, SPI, Signal K, Serial, GPIO, kplex. They all seem interconnected but I fail to see the big picture, where all the data passes by, even with the documentation workflow image, plus many of the pages about the things I don't understand like MQTT and SPI are empty in both old and new docs.

So anyways, I managed to make our analog oil pressure sensors work with an Arduino Uno board I had lying around and send it over I2C to OpenPlotter, until I realized that you can only add sensors that were pre-configured in OpenPlotter, not custom sensors. So I cloned the OP repo and searched in the code where that list was to configure my own I2C sensor in the files (add_i2c.py, openplotter.py, the .pypilot/RTIMULib files) until I realized that thers's no way the devs wanted it to be that complicated.

Then I read this thread about someone trying to send data via I2C from Arduino Uno to RPi with the same problem as mine:
http://forum.openmarine.net/showthread.p...hlight=i2c
And most people seem to say that Node-Red is the solution (I avoided it until now since I thought it was a programming language for kids like scracth hahaha). Is there a way however to send the I2C data to Node-Red somehow? If I can get the oil pressure on a dashboard there, AND other I2C (like the BMP180) sensors to all display there without having to use the Signal K instruments panel, it would be awesome! If there's an obvious solution to only use Node-red for everything, please point me in the right direction and I'll do my homework and read the docs, as long as I stop going in circles!

I've seen amazing Code-Red dashboard in the forums like these:
http://forum.openmarine.net/showthread.php?tid=1087
And this one (Unfortunately using MQTT that I don't undersand):
http://www.ybw.com/forums/showthread.php...d-node-red
and now I really want to use it, I got some great tutorial videos and links so I'll go read this tomorrow.

In the meantime, can someone also answer these questions please:
-Is it possible to send I2C data to Node-Red? I liked i2C because I can just connect the Arduino Uno to SCL and SDA, without needing a level shifter or resistance + no need for a USB hub (as I can't get one now far from a decent town). Not sure if I'm supposed to use something like this:
https://github.com/SignalK/node-red-embedded

-Am I supposed to send the i2C sensor data over NMEA using the generator somehow? It seems like it's only pre-generated sentences with specific sensors, nothing custom.

-Can OpenCPN display other data than NMEA? For example i2C, Serial or GPIO sensors, I guess by using plugins like "Dashboard"?

Thanks for reading all this and enduring my confusing post XD I feel like I can't see the easy way out in front of me, just like this picture XD
  Reply
#2
example import clipboard opencpn is limited to a few things it can display you can use dashboard in NR

Code:
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 \n           //if (typeof(msg.userLed) != \"undefined\") radial4.setUserLedOnOff(msg.userLed);  \n          // if (typeof(msg.trend) != \"undefined\")\n            {\n               // if (msg.trend==1)     radial4.setTrend(steelseries.TrendState.UP);\n                //if (msg.trend==0)     radial4.setTrend(steelseries.TrendState.STEADY);\n               // if (msg.trend==-1)    radial4.setTrend(steelseries.TrendState.DOWN);\n               // if (msg.trend==-2)    radial4.setTrend(steelseries.TrendState.OFF);\n            }\n        });\n    })(scope);\n\n    var sections = [steelseries.Section(0, 25, 'rgba(0, 0, 220, 0.3)'),\n                        steelseries.Section(25, 50, 'rgba(0, 220, 0, 0.3)'),\n                        steelseries.Section(50, 75, 'rgba(220, 220, 0, 0.3)') ],\n\n            // Define one area\n    areas = [steelseries.Section(75, 100, 'rgba(220, 0, 0, 0.3)')],\n\n    tempout = new steelseries.Linear('tempout', {\n            gaugeType: steelseries.GaugeType.TYPE2,\n            width: 140,\n            height: 300,\n            //size: 292,\n            section: sections,\n            area: areas,\n            titleString: \"Inside\",\n            unitString: \"Degrees F\",\n            threshold: 80,\n            lcdVisible: true,\n           \n            //thresholdRising: false,\n           // userLedVisible: true,\n           // useOdometer: true,\n          //  lcdVisible: true,\n           // trendVisible: true\n        });\n                        \n    tempout.setFrameDesign(steelseries.FrameDesign.BRASS);\n    tempout.setValueAnimated(0);\n    tempout.setPointerType(steelseries.PointerType.TYPE9);\n   // radial4.setThreshold(50);\n    //radial4.blinkUserLed(0);\n   // radial4.setOdoValue(0);\n\n\n</script>\n\n<canvas id=\"tempout\" width=\"140\" height=\"300\"></canvas>\n","storeOutMessages":true,"fwdInMessages":true,"x":1198.0003967285156,"y":588.0000686645508,"wires":[[]]},{"id":"28f5b60f.9eb77a","type":"function","z":"82321e4.b0af8e","name":"Water Temp","func":"var signalk_key=\"environment.water.temperature\";\n\nif(msg.payload.hasOwnProperty(signalk_key)){\n    msg.payload=msg.payload[signalk_key];\n    return msg;\n    \n\n}","outputs":1,"noerr":0,"x":639,"y":563.000002861023,"wires":[["ece38a60.7f99c8"]]},{"id":"ee83bd35.bdac9","type":"function","z":"82321e4.b0af8e","name":"","func":"msg.value=msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":976.000057220459,"y":588.0000066757202,"wires":[["11507251.ffafbe"]]},{"id":"ece38a60.7f99c8","type":"function","z":"82321e4.b0af8e","name":"K to F","func":"var temp = msg.payload;\n\nvalue = (temp * 9.0) / 5.0 - 459.67; \nmsg.payload=value;\nreturn msg; ","outputs":1,"noerr":0,"x":779,"y":563.000002861023,"wires":[[]]},{"id":"1d6e8fe5.f399d","type":"function","z":"82321e4.b0af8e","name":"cabin pres","func":"var signalk_key=\"environment.outside.pressure\";\n\nif(msg.payload.hasOwnProperty(signalk_key)){\n    msg.payload=msg.payload[signalk_key];\n    return msg;\n    \n\n}","outputs":1,"noerr":0,"x":639,"y":603.000002861023,"wires":[["cffed0ba.ba82b"]]},{"id":"cffed0ba.ba82b","type":"ui_chart","z":"82321e4.b0af8e","name":"","group":"1e14c235.4fc26e","order":2,"width":0,"height":0,"label":"cabin pres","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"604800","cutout":0,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"x":799,"y":603.000002861023,"wires":[[],[]]},{"id":"4b42071a.e35c88","type":"function","z":"82321e4.b0af8e","name":"cabin temp","func":"var signalk_key=\"environment.inside.mainCabin.temperature\";\n\nif(msg.payload.hasOwnProperty(signalk_key)){\n    msg.payload=msg.payload[signalk_key];\n    return msg;\n    \n\n}","outputs":1,"noerr":0,"x":639,"y":643.000002861023,"wires":[["ee81c52e.60bd18"]]},{"id":"5f3ba447.cc53ec","type":"ui_chart","z":"82321e4.b0af8e","name":"cabin temp","group":"1e14c235.4fc26e","order":1,"width":0,"height":0,"label":"cabin temp","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"x":1075.1666870117188,"y":643.0000114440918,"wires":[[],[]]},{"id":"ee81c52e.60bd18","type":"function","z":"82321e4.b0af8e","name":"K to F","func":"var temp = msg.payload;\n\nvalue = (temp * 9.0) / 5.0 - 459.67; \nmsg.payload=value;\nreturn msg; ","outputs":1,"noerr":0,"x":781,"y":643.3333387374878,"wires":[["5f3ba447.cc53ec","ee83bd35.bdac9"]]},{"id":"a26efae0.3bb758","type":"function","z":"82321e4.b0af8e","name":"float","func":"var signalk_key=\"sensors.floatswitch\";\n\nif(msg.payload.hasOwnProperty(signalk_key)){\n    msg.payload=msg.payload[signalk_key];\n    return msg;\n    \n\n}","outputs":1,"noerr":0,"x":630,"y":681,"wires":[["c19bf413.43a098"]]},{"id":"41d6b650.f16a38","type":"websocket-listener","z":"","path":"ws://localhost:3000/signalk/v1/stream","wholemsg":"false"},{"id":"1e14c235.4fc26e","type":"ui_group","z":"","name":"ENVIRONMENT","tab":"8b452ef1.b3d38","order":1,"disp":true,"width":"6"},{"id":"8b452ef1.b3d38","type":"ui_tab","z":"","name":"Tab 2","icon":"dashboard","order":2}]
mare liberum
  Reply
#3
(11-07-2018, 10:31 AM)NaturalBornCamper Wrote: So anyways, I managed to make our analog oil pressure sensors work with an Arduino Uno board I had lying around and send it over I2C to OpenPlotter, until I realized that you can only add sensors that were pre-configured in OpenPlotter, 

You can send the data direct to signalk over serial from the arduino, like this - 
Code:
#include "ArduinoJson.h"
int LED_pin = 2;


void setup() {
 // put your setup code here, to run once:
 Serial.begin(4800);

// Serial.println("Starting Up, Please Wait...");
 // initialize digital pin LED_BUILTIN as an output.
 pinMode(LED_pin, OUTPUT);
}

void loop() {
 // put your main code here, to run repeatedly:

 int randon_num = random(1, 300);
 sendSigK("mytest.test.test", randon_num);
 
 int state = digitalRead(LED_pin);
 digitalWrite(LED_pin, !state);
 delay(2000);

}



void sendSigK(String sigKey, float data) {    //    send SigK


 DynamicJsonBuffer jsonBuffer;
 String deltaText;

 //  build delta message
 JsonObject& delta = jsonBuffer.createObject();

 //updated array
 JsonArray& updatesArr = delta.createNestedArray("updates");
 JsonObject& thisUpdate = updatesArr.createNestedObject();   //Json Object nested inside delta [...
 JsonArray& values = thisUpdate.createNestedArray("values"); // Values array nested in delta[ values....
 JsonObject& thisValue = values.createNestedObject();
 thisValue["path"] = sigKey;
 thisValue["value"] = data;

 thisUpdate["Source"] = "ESP11";
 delta.printTo(Serial);
 Serial.println();
}

Then you need to add this to   /home/pi/.signalk/settings.json - underneath the lines >
 },
  "loggingDirectory": "/home/pi/Logs",
  "mdns": false,
  "pipedProviders": [
Code:
{
      "enabled": true,
     "id": "nmeaFromFile",
     "pipeElements": [
       {
         "type": "providers/serialport",
         "options": {
           "device": "/dev/ttyUSB2",
           "baudrate": 4800,
           "toStdout": ["nmea0183out1", "nmea0183out2"]
         },
         "optionMappings": [
           {
             "fromAppProperty": "argv.nmeadevice",
             "toOption": "device"
           },

           {
             "fromAppProperty": "argv.nmeabaudrate",
             "toOption": "baudrate"
           }
         ]
       },
       {
         "type": "providers/from_json",
         "options": {
           "sentenceEvent": "nmea0183in1"
         },
         "optionMappings": [
           {
             "fromAppProperty": "selfId",
             "toOption": "selfId"
           },
           {
             "fromAppProperty": "selfType",
             "toOption": "selfType"
           }
         ]
       }
     ]
   },

Then it should be added as signalk. Opencpn only see NMEA data so you'll need to convert it to NMEA it you want to see the data in that prog.
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