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#!/usr/bin/env python
# Copyright (c) 2009 James Snyder
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#
# PROGRAM DESCRIPTION
# Plots real-time data from analog inputs from Firmata on Arduino
#
# COMPUTER SETUP
# Required Libs:
# matplotlib, wx, pyduino, multiprocessing (works with backport for 2.5), numpy
#
# ARDUINO SETUP:
# Arduino has StandardFirmata firmware installed
# Connect things to analog inputs and set numinputs to how many adc inputs you want
import matplotlib
matplotlib.use('WXAgg')
matplotlib.rcParams['toolbar'] = 'None'
import wx, sys, time, pyduino
import pylab as p
import numpy as npy
from multiprocessing import Process, Queue
from ringbuffer import *
def adc_get_sample(pin):
a.iterate()
return a.analog[pin].read()
def get_analog_data(q):
while not q.full():
for i in range(numinputs):
q.put((i, adc_get_sample(i)))
def update_line(*args):
while not q.empty():
newdata = q.get()
databufs[newdata[0]].append(newdata[1])
if update_line.background is None:
update_line.background = canvas.copy_from_bbox(ax.bbox)
# restore the clean slate background
canvas.restore_region(update_line.background)
# update the data
for i in range(numinputs):
lines[i].set_ydata(databufs[i])
# just draw the animated artist
for line in lines:
ax.draw_artist(line)
# just redraw the axes rectangle
canvas.blit(ax.bbox)
wx.WakeUpIdle()
if __name__ == '__main__':
# Canvas Setup
ax = p.subplot(111)
canvas = ax.figure.canvas
p.grid() # to ensure proper background restore
# Arduino Setup
a = pyduino.Arduino('/dev/tty.usbserial-A6006kiD')
# Data Storage Setup
numinputs = 5
x = npy.linspace(0,1,100)
databufs = [RingBuffer(x.size) for i in range(numinputs)]
for i in range(numinputs):
a.analog[i].set_active(1)
for i in range(x.size):
for ch in range(numinputs):
databufs[ch].append(adc_get_sample(ch))
lines = [p.plot(x,databufs[i], animated=True, lw=2).pop() for i in range(numinputs)]
p.axis([min(x), max(x), 0, 1])
q = Queue()
proc = Process(target=get_analog_data, args=(q,))
proc.start()
update_line.background = None
wx.EVT_IDLE(wx.GetApp(), update_line)
p.show()
proc.join()