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Built new NMEA sentence with Barometric pressure inhg and millibars - Printable Version +- OpenMarine (https://forum.openmarine.net) +-- Forum: OpenPlotter (https://forum.openmarine.net/forumdisplay.php?fid=1) +--- Forum: How do I...? (https://forum.openmarine.net/forumdisplay.php?fid=3) +--- Thread: Built new NMEA sentence with Barometric pressure inhg and millibars (/showthread.php?tid=4549) |
Built new NMEA sentence with Barometric pressure inhg and millibars - Arnie419 - 2023-03-28 Am trying to rebuilt a a existing NMEA sentence into a new sentence which contains Inches of Mercury and Millibars, however i am litle stuck on this. I have a sensor which is putting out a fixed number without decimal point so need to get that into a number with 2 numbers. 1 mBar seems to be 0.029529983071445 inhg according to NOAA. The following NMEA sentence needs to be build: $WIMMB,29.83,I,1010.3,B*64 Where, 29.82 = value in inhg (inches per Mercury) I = indicator for Inches 1010.3 = pressure in mBars B= indicator for Bar When i use the following code in Node-Red as seen in attachment it shows me only the first half of the sentence (with mBar at the wrong place but that´s only to show if the string is working, needs conversion there). Is anyone able to assist me to get this string complete with correct indication of inhg and Mbar with 2 decimals behind the digit??. By the way, during another conversion i figured out that the checksum is calculated with a small alphabetical letter instead of a capital letter according to NMEA standards, OpenCPN is accepting this sentence but obviously the sentence is not 100% according NMEA protocol, is there any way to change small letters into capital regarding checksum?? Hope somebody can help me. RE: Built new NMEA sentence with Barometric pressure inhg and millibars - yiannis - 2023-03-28 (2023-03-28, 07:33 AM)Arnie419 Wrote: Am trying to rebuilt a a existing NMEA sentence into a new sentence which contains Inches of Mercury and Millibars, however i am litle stuck on this.You have an extra comma there. Punctuation is the difference between letting your uncle Jack, off a horse and letting your uncle, jack off a horse! ![]() RE: Built new NMEA sentence with Barometric pressure inhg and millibars - Arnie419 - 2023-03-29 Ahh, yes that was the error, was late already so mistakes happens quickly. Thanks for the hint. Btw. shouldn´t jack off a horse...... :-) |