Roger Comments - Answer Overflow

You would have to experiment with it to see what you get. The current should be fairly low, and the number of wraps will affect the voltage. Spark plugs normally operate at several thousand volts, but with very little current. You would basically be creating an induction coil around the plug lead. Another, ready made option is to use an induction clamp from an automotive multi meter.

5 replies

SKSignal K

•Created by barnaclebill on 5/16/2024 in #sensors

barnaclebill - Any recommendations for a way to...

A wire wrapped around the spark plug lead will generate a ac voltage when it’s running. Run that through a suitable circuit and you have an rpm counter.

5 replies

SKSignal K

•Created by LinnJS on 4/21/2024 in #announcements

signalk-to-mongodb version 2.1.1

I suspect that it was a 32 bit issue

9 replies

SKSignal K

•Created by LinnJS on 4/21/2024 in #announcements

signalk-to-mongodb version 2.1.1

https://www.mongodb.com/developer/products/mongodb/mongodb-on-raspberry-pi/ It does seem like it's now possible to install mongodb on a 64bit RPi

9 replies

SKSignal K

•Created by nimblewillo on 4/7/2024 in #sensesp

nimblewillo - Is anyone using sensesp to create...

After a bit more research, it looks like there are a set of alert PNGs (126983 - 126988) but they aren't currently implemented in the nmea2000 library. They are listed in the canboat docs but with the caveat that they aren't fully reverse engineered.

26 replies

SKSignal K

•Created by mgrouch on 4/8/2024 in #server

mgrouch - I have a feature request. Can SignalK...

Just having the Remember Me switch actually remember for more than a day would be a great start.

10 replies

SKSignal K

•Created by nimblewillo on 4/7/2024 in #sensors

nimblewillo - Anyone built an anchor chain coun...

I think @gregy has built one.

8 replies

SKSignal K

•Created by nimblewillo on 4/7/2024 in #sensesp

nimblewillo - Is anyone using sensesp to create...

I've used an engine HAT to send engine alarms over n2k. Where possible, I prefer to send the data directly onto the n2k network and then receive it from there in signalk if needed. That way, the MFD showing the info isn't reliant on signalk.
According to the N2k API, 127505 (Fluid Level) is used for bilge level.

26 replies

SKSignal K

•Created by nimblewillo on 4/7/2024 in #sensors

nimblewillo - Anyone built an anchor chain coun...

Voltage sensing on the up button is the best method to use and it would only require a single digital input and would be more reliable than two reed switches (they would read backwards if the trigger magnet started between them). By using the up switch, it would allow the counter to still count if the windlass is freewheeling down.

8 replies

SKSignal K

•Created by nimblewillo on 4/2/2024 in #sensors

nimblewillo - Has anyone looked at using temper...

Why not just use two probes connected to an ESP32? One probe outputs a signal voltage, and the other probe receives it on a digital pin if both probes are in the water. It's a simple concept that's been used for years to detect water levels. The feed probe should be at the same level or above the sense probe so you're not constantly feeding a voltage into the water if it's not quite covering both.

6 replies

SKSignal K

•Created by Roger on 4/2/2024 in #questions

Export position data as gpx

I just got back from a 48 hour non-stop sail and one of the crew wanted a copy of the track. I managed to grab it from postgsail so all good here.

6 replies

SKSignal K

•Created by Roger on 4/2/2024 in #questions

Export position data as gpx

I can get the data from that plugin in json format, but it's just returning an empty track in gpx format.

<?xml version="1.0" encoding="UTF-8" ?>
 <gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="signalk-to-influxdb2">
  <metadata><author>vessels.urn:mrn:imo:mmsi:235081523</author></metadata>
  <trk>
  </trk>
 </gpx>

<?xml version="1.0" encoding="UTF-8" ?>
 <gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="signalk-to-influxdb2">
  <metadata><author>vessels.urn:mrn:imo:mmsi:235081523</author></metadata>
  <trk>
  </trk>
 </gpx>

6 replies

SKSignal K

•Created by Johnathan B on 3/26/2024 in #sensors

Johnathan B - HiCould someone point me in the ...

" is a “ and json must start with a {. I suspect that python has a function to create valid json from a string value. Try generating your json as a string (wrap it in “s) and use that function to generate valid json.

11 replies

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