I try to find a way to read analog data from Arduino and show the data on a time chart. What is the best approach to do this. I am new to the arduino. Any suggestion is appreciated. Thank you
I try to find a way to read analog data from Arduino and show the data on a time chart.
FWIW I did this yesterday with python-gnuplot.
$ python go.py /dev/tty/USB01
#!/usr/bin/env python2.5
import Gnuplot
import serial
import sys
ser = serial.Serial(sys.argv[1], 9600)
readings = []
g = Gnuplot.Gnuplot()
g.title("Thermistor readings")
g('set data style lines')
g('set yrange [-5:105]')
while 1:
reading = ser.readline().split()
print reading
readings.append(reading)
if len(readings) > 100:
readings = readings[-10:]
g.plot(readings)
In arduino:
#define REPORTING_INTERVAL 1
float time;
int reading;
void read_pin(char pin)
{
while (1) {
time = 0.001 * millis();
reading = analogRead(pin);
Serial.print(time);
Serial.print(' ');
Serial.println(reading);
delay(1000*REPORTING_INTERVAL);
}
}
void setup()
{
Serial.begin(9600);
delay(100);
}
void loop()
{
read_pin(4);
}
thanks rFree for this great python-script,
but perhaps someone can tell me how to do the the same with
bash-scripting and gnuplot?
Matlab is a great tool for making plots, runs on all platforms and is easy to use, since u can manipulate ur graphs interactively
Hello efree,
I like your code in phyton.
My original thinking is to capture the data from arduino and save it as a text file or something similar and later on, use a program like excel to grapgh the data.
Do you have suggestion how to save the data to plot at a later date?
Sorry to hijack this thread, but after days of searching...
I think the best solution that works for me is something like this:
#!/bin/sh
stty -F /dev/ttyUSB0 115200 -raw -hup
echo -n "" > data #file for data
sleep 1
while true; do
cat "/dev/ttyUSB0" | sed q >> data
#dd if=/dev/ttyUSB0 count=1 2>/dev/null >>data
echo set yrange [0:300]
echo set xlabel \"time\"
echo set ylabel \"temp\"
echo plot \"data\" with lines
sleep 1
done
save as "plot.sh", call with:
./plot.sh | gnuplot
Thanks!
Hi,
Another method is use windows hyperterminal or a free terminal which can save into a file.
If you send data from Arduino as csv format(example semicolon separated), you can open this file with Excel directly and use its graphs....
Also it´s easy to do something in Excel with VBA and Netcomm
http://home.comcast.net/~hardandsoftware/NETCommOCX.htm
I´ve done an example: http://yqezpq.blu.livefilestore.com/y1plxKnMriMftb6U4LjMkuFyvIxfDmHMJ53KkprvNIDj2bZN2274uXlUUVqvrs7fS9a3xtWWcA2mrkuyFJd5vlJZA/Comunicación%20con%20Arduino%20v2.xls?download
Regards,
Igor R.
GoBetwino will let you dump data directly from Arduino into Excel, or log it to a txt file first (and a lot of other thins too).
MikMo, good job!! Cool!