Signal definition examples for NMEA type

In the examples below, signal definitions that convert NMEA data into physical values are registered.

We assume that we have data as shown below, whose address field is GPRMC:

$GPRMC,085120.307,A,3541.1493,N,13945.3994,E,000.0,240.3,181211,,,A*6A

Index	Value example	Meaning
0	085120.307	Time in UTC
1	A	Status (A = Valid)
2	3541.1493	Latitude
3	N	North/South
4	13945.3994	Longitude
5	E	East/West
6	000.0	Speed over ground
7	240.3	Course over ground
8	181211	Date in UTC
9	(blank)	Magnetic variation, degrees
10	(blank)	Magnetic variation, east/west
11	A	Mode (A = Autonomous)
12	*6A	Checksum

In the following sections, we will register signal definitions to retrieve latitude and longitude from data in the above format.

Overview of the signal definitions

Item	Setting contents
Type of time series data to be converted	intdash.DataType.nmea
Conversion to be applied	intdash.ConversionCSV

Register signal definitions

Create an access object for signal definitions.

import intdash

client = intdash.Client(
    url = "https://example.intdash.jp",
    edge_token = "your_token",
)

sig = client.signals

Register each signal definition as shown below.

Latitude ( index=2 )

s = sig.create(
    label="GNRMC_LAT",
    data_type=intdash.DataType.nmea,
    data_id='GNRMC',
    channel=1,
    conversion=intdash.ConversionCSV(
        delimiters=[','],
        index=2,
        value_type='str'
    ),
    display=intdash.Display(
        unit='',
        min=0,
        max=360,
        format='%s',
    ),
)

Longitude ( index=4 )

s = sig.create(
    label="GNRMC_LNG",
    data_type=intdash.DataType.nmea,
    data_id='GNRMC',
    channel=1,
    conversion=intdash.ConversionCSV(
        delimiters=[','],
        index=4,
        value_type='str'
    ),
    display=intdash.Display(
        unit='',
        min=0,
        max=360,
        format='%s',
    ),
)