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Logical name of the module
The logical name is a name that you choose, which allows you to access your module, in the same
way a file name allows you to access its content. A logical name has a maximum length of 19
characters. Authorized characters are
A
..
Z
,
a
..
z
,
0
..
9
,
_
, and
-
. If you assign the same logical name
to two modules connected to the same computer and you try to access one of them through this
logical name, behavior is undetermined: you have no way of knowing which of the two modules
answers.
Luminosity
This parameter allows you to act on the maximal intensity of the leds of the module. This enables
you, if necessary, to make it a little more discreet, while limiting its power consumption. Note that this
parameter acts on all the signposting leds of the module, including the Yocto-led. If you connect a
module and no led turns on, it may mean that its luminosity was set to zero.
Logical names of functions
Each Yoctopuce module has a serial number and a logical name. In the same way, each function on
each Yoctopuce module has a hardware name and a logical name, the latter can be freely chosen by
the user. Using logical names for functions provides a greater flexibility when programming modules.
You can assign logical names to several functions of the Yocto-GPS by clicking on the corresponding
"rename" button.
The GPS function
The
gps
function groups all the measures computed by the module: position, ground speed, travel
direction, time, and so on... Latitude and longitude are presented as character strings with a format to
be selected between DD°MM'SS.SSS", DD°MM.MMMM, and DD.DDDDDD. You can make do with
only this function. But if you need to make calculations on the positions, or if you want to use
callbacks
5
, the following functions prove useful.
Latitude and Longitude functions
They enable you to obtain the current latitude and longitude in numerical format, independently of the
display format selected in the GPS function. Note, for technical reasons, the values are not given in
degrees but in millidegrees (thousandths of degree).
The Altitude function
It returns an estimate of the current altitude. Beware, altitude computations based on GPS systems
are very imprecise. Expect errors of several tens of meters.
The groundSpeed function
The Yocto-GPS can compute the ground speed, that is the horizontal speed relative to the ground.
Limitations
The Yocto-GPS has pretty standard limitations: it will lose track if any of the following limits are
exceeded:
• ITAR limits: velocity greater than 515 m/s AND altitude above 18,000 m
• altitude: 100,000 m (max) or -1500 m (min)
• velocity: 600 m/s (max)
• acceleration: 2g (max)
5
See the chapter on "Advanced programming"
3. First steps
www.yoctopuce.com
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Содержание Yocto-GPS
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