Updated 2023-11-05 !
An introduction to the SignalK, Marine application, is given here.A very easy way to measure temperature with Raspberry Pi, RPi, is to connect one wire (1W) DS18B20 (DS)temperature sensors direkt to the RPi GPIO.
Here You find a post where the temperatures are transfered via WiFi
Using the NodeRed(NR) plugin, in SignalK(SK), will forward the temperature measure to a SignalK path, despite You maybe don't have any advanced programming skills.
You can even send the temperature on to a NMEA 2000/0183 network with sufficient hardware.
Start with installing the DS hardware following the instructions in this post, Basic setup.
NR is browser-based editor for the Internet of Things and is installed in SK as a plugin, @signalk/signalk-node-red, via the admin UI.
Here is a link to a quick NR intro and the link to NR website.
In NR, opened via admin UI(Webapps), install the node module node-red-contrib-ds18b20-sensor
Then copy this flow to Your clipboard and import it to NR.
The flow is started every 5 seconds, change to what is appropriate in Your case, with the inject node.
The rpi-ds18b20 node will create an array with detected DS sensors.
The split node will create a separate message for every detected DS sensor.
In the function node, values are changed with Java code.
The program fetches the actual temperature, converts it from Celsius to Kelvin, and the DS serial number(DS id).
The next part matches the actual DS id and sets the appropriate SignalK path. Here You should change so it matches Your setup. If no match the node will return null.
The last part just sets the output preparing for the last node signalk-send-pathvalue which is sending the values to the SK Node server.
In my case an Actisense NTG-1 is installed and I want to display the "engineRoom temperature" in my N2K instruments. The signalk-to-nmea2000 plugin, in Node Server, will do the job.
In the Plugin Config click "Active" and enable "Engine Room Temperature" and then "Submit".
130312, mentioned in the config, is the N2K pgn that will be created.
Setup is complete and You will see the temperature in Your N2K instruments.
My instruments hadn't the possibility to display the exhaust temperatures so instead I used the nice WilhelmSK app diskussed here.
A SignalK/Node-Red post setting up alarm for exhaust/temperature
Using the NodeRed(NR) plugin, in SignalK(SK), will forward the temperature measure to a SignalK path, despite You maybe don't have any advanced programming skills.
You can even send the temperature on to a NMEA 2000/0183 network with sufficient hardware.
Start with installing the DS hardware following the instructions in this post, Basic setup.NR is browser-based editor for the Internet of Things and is installed in SK as a plugin, @signalk/signalk-node-red, via the admin UI.
Here is a link to a quick NR intro and the link to NR website.
In NR, opened via admin UI(Webapps), install the node module node-red-contrib-ds18b20-sensor
Then copy this flow to Your clipboard and import it to NR.
The flow is started every 5 seconds, change to what is appropriate in Your case, with the inject node.
The rpi-ds18b20 node will create an array with detected DS sensors.
The split node will create a separate message for every detected DS sensor.
In the function node, values are changed with Java code.
tempIn = msg.payload.temp + 273.15;
tempDsId = msg.payload.file
switch(tempDsId) {
case "28-0417a20e6dff" :
SkPath = "propulsion.starboard.exhaustTemperature";
break;
case "28-051693ec41ff" :
SkPath = "propulsion.port.exhaustTemperature";
break;
case "28-123493ec41ff" :
SkPath = "environment.inside.engineRoom.temperature";
break;
default:
return msg[null];
}
msg = {};
msg.payload = tempIn;
msg.topic = SkPath;
msg.DsId = tempDsId;
return msg;
tempDsId = msg.payload.file
switch(tempDsId) {
case "28-0417a20e6dff" :
SkPath = "propulsion.starboard.exhaustTemperature";
break;
case "28-051693ec41ff" :
SkPath = "propulsion.port.exhaustTemperature";
break;
case "28-123493ec41ff" :
SkPath = "environment.inside.engineRoom.temperature";
break;
default:
return msg[null];
}
msg = {};
msg.payload = tempIn;
msg.topic = SkPath;
msg.DsId = tempDsId;
return msg;
The program fetches the actual temperature, converts it from Celsius to Kelvin, and the DS serial number(DS id).
The next part matches the actual DS id and sets the appropriate SignalK path. Here You should change so it matches Your setup. If no match the node will return null.
The last part just sets the output preparing for the last node signalk-send-pathvalue which is sending the values to the SK Node server.
In my case an Actisense NTG-1 is installed and I want to display the "engineRoom temperature" in my N2K instruments. The signalk-to-nmea2000 plugin, in Node Server, will do the job.
In the Plugin Config click "Active" and enable "Engine Room Temperature" and then "Submit".
130312, mentioned in the config, is the N2K pgn that will be created.
Setup is complete and You will see the temperature in Your N2K instruments.
My instruments hadn't the possibility to display the exhaust temperatures so instead I used the nice WilhelmSK app diskussed here.
A SignalK/Node-Red post setting up alarm for exhaust/temperature
Thanks for sharing this! I am having trouble duplicating the flow. I copied and imported it but I can't figure out how to save it after modifying it to fit my application. Also I don't see the path it is sending to SignalK. Which block would that be in? Thanks, Al
ReplyDeleteClick on ”Deploy” which will save and run Your flow. The path is stored in “msg.topic” set in the function node. Check the objects content, activating and showing debug messages.
Delete