Hardware Reference
In-Depth Information
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When the
-g
option is used, three lines are produced for each event:
Time of prior event, with previous state
•
•
Time of current event, with previous state
•
Time of current event, with current state, with time lapse in
column 3
If
gnuplot
is absent, you can install it on your Raspberry Pi as follows:
$ sudo apt-get install gnuplot-x11
These data plots can then be read into
gnuplot
to display a waveform. Create a file
named
gnuplot.cmd
with these commands in it:
set title "IR Remote Waveform"
set xlabel "Time (ms)"
set ylabel "Level"
set autoscale
set yrange [−.1:1.2]
plot "gnuplot.dat" using 1:2 with lines
Collect your output into a file named
gnuplot.dat
(or change the file
gnuplot.cmd
to
use a different file name). Then run
gnuplot
on the data:
$ gnuplot -p gnuplot.cmd
Figure
5-3
shows an example plot display. Note that you'll normally have to edit out
all but the most interesting lines of data. Otherwise, your plot will be a rather crowded
display of vertical lines.
