/usr/share/expeyes/eyes/LED_iv.py is in expeyes 3.1.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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expEYES program
Author : Ajith Kumar B.P, bpajith@gmail.com
License : GNU GPL version 3
'''
import gettext
gettext.bindtextdomain("expeyes")
gettext.textdomain('expeyes')
_ = gettext.gettext
from Tkinter import *
from numpy import *
import expeyes.eyes as eyes, expeyes.eyeplot as eyeplot, expeyes.eyemath as eyemath, time, sys
TIMER = 10
WIDTH = 600 # width of drawing canvas
HEIGHT = 400 # height
VSET = 0 # this will change in the loop
VSETMIN = 0 # may change this to -5 for zeners
VSETMAX = 4.5
STEP = 0.050 # 50 mV
MINX = 0 # may change this to -5 for zeners
MAXX = 4 # No diode will go beyond this
MINY = 0 # may change this to -5 for zeners
MAXY = 5 # Maximum possible current
history = [] # Data store
trial = 0 # trial number
data = [ [], [] ] # Current & Voltage
index = 0
running = False
def start():
global VSET, running, index, data
VSETMIN = 0.0
MINX = 0.0
MINY = 0.0
g.setWorld(MINX, MINY, MAXX, MAXY,_('V'),_('mA'))
running = True
data = [ [], [] ]
VSET = VSETMIN
index = 0
root.after(TIMER,update)
def update(): # Called periodically by the Tk toolkit
global VSETMAX, VSET, STEP, index, trial, running, data, history
if running == False:
return
p.set_voltage(0, VSET)
time.sleep(0.001)
va = p.get_voltage(0) # voltage across the diode
i = (VSET-va)/1.0 # in mA, R= 1k
data[0].append(va)
data[1].append(i)
VSET += STEP
if VSET > VSETMAX:
running = False
history.append(data)
trial += 1
g.delete_lines()
for k in range(len(history)):
g.line(history[k][0], history[k][1], k)
return
if index > 1: # Draw the line
g.delete_lines()
g.line(data[0], data[1], trial)
index += 1
root.after(TIMER, update)
msg.config(text=_('Starting to plot I-V'))
def xmgrace(): # Send the data to Xmgrace
global history
aa = []
bb = []
for k in range(len(data[0])):
if data[1][k] > 1.0:
bb.append(data[0][k])
aa.append(data[1][k])
p.grace([ [aa,bb] ], _('mA'),_('Volts'), _('Linear part of IV Curve (I > 1mA)'))
def save():
global history, running
if running == True:
return
s = e1.get()
if s == '':
return
p.save(history, s)
msg.config(text = _('Data saved to file ')+s)
def eval(a,xpoints,x):
n = len(xpoints) - 1
p = a[n]
for k in range(1,n+1):
p = a[n-k] + (x -xpoints[n-k]) * p
return p
def coef(x,y):
a = copy(y)
m = len(x)
for k in range(1,m):
a[k:m] = (a[k:m] - a[k-1])/(x[k:m]-x[k-1])
return a
def fit_curve():
global data, running
if running == True or len(data[0])==0:
return
aa = []
bb = []
for k in range(len(data[0])):
if data[1][k] > 1.0:
aa.append(data[0][k])
bb.append(data[1][k])
x = array(bb)
y = array(aa)
from scipy import polyfit, polyval
(ar,br)=polyfit(x,y,1)
print polyval([ar,br],[0])
def clear():
global history, trial, running
if running == True:
return
g.delete_lines()
history = []
trial = 0
p = eyes.open()
p.loadall_calib()
p.disable_actions()
root = Tk()
Canvas(root, width = WIDTH, height = 5).pack(side=TOP) # Some space at the top
g = eyeplot.graph(root, width=WIDTH, height=HEIGHT) # make plot objects using draw.disp
g.setWorld(MINX, MINY, MAXX, MAXY,_('V'),_('mA'))
cf = Frame(root, width = WIDTH, height = 10)
cf.pack(side=TOP, fill = BOTH, expand = 1)
b1 = Button(cf, text = _('START'), command = start)
b1.pack(side = LEFT, anchor = N)
b3 = Button(cf, text = _('SAVE to'), command = save)
b3.pack(side = LEFT, anchor = N)
filename = StringVar()
e1 =Entry(cf, width=15, bg = 'white', textvariable = filename)
filename.set('lediv.dat')
e1.pack(side = LEFT)
b5 = Button(cf, text = _('QUIT'), command = sys.exit)
b5.pack(side = RIGHT, anchor = N)
b4 = Button(cf, text = _('CLEAR'), command = clear)
b4.pack(side = RIGHT, anchor = N)
b5 = Button(cf, text = _('Grace'), command = xmgrace)
b5.pack(side = RIGHT, anchor = N)
b5 = Button(cf, text = _('FIT'), command = fit_curve)
b5.pack(side = RIGHT, anchor = N)
mf = Frame(root, width = WIDTH, height = 10)
mf.pack(side=TOP, fill = BOTH, expand = 1)
msg = Label(mf,text=_('Message'), fg = 'blue')
msg.pack(side=LEFT)
eyeplot.pop_image('pics/LED_iv.png', _('LED IV char. Connections'))
root.title(_('EYES: LED IV characteristics'))
root.mainloop()
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