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Global in python not working as expected


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  #1  
Old July 8th, 2012, 08:52 PM
klein5366 klein5366 is offline
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Global in python not working as expected
good day
i'm new to python and trying to learn how to control an arduino via serial communication, i have everything sorted out but!!!!!! i have three buttons that send commands to my arduino that all works fine, i need a way to lock cretin buttons out after others have been pushed.

bup = boom up > boom motor ccw
stop= stop bup and bdown
bdown= boom down > boom motor cw

so if bup has been pushed then bdown doesn't do anything untill stop has been pushed if bdown has been pushed then bup doesn't do anything till stop has been pushed.

i can Wright the code in c on the arduino but i was hoping to be able to do it in python. i tried setting global variables but it doesn't seem to work correctly

#!/usr/bin/env python
from Tkinter import *
from arduinoController import *
the_port = '/dev/ttyACM0'
close(the_port)
init(the_port)
bup = '0'
bdown = '0'


class MyApp(Frame):
def __init__(self,master=None):
Frame.__init__(self,master)
self.grid(sticky=N+S+E+W)
self.createWidgets()
def createWidgets(self):
top=self.winfo_toplevel()
top.rowconfigure(0,weight=1)
top.columnconfigure(0,weight=1)
self.rowconfigure(0,weight=1)
self.columnconfigure(0,weight=1)

self.up = Button(self,text='B Up',activebackground='green',cursor='gumby',command=self.bup)
self.up.grid(row=1,column=1,sticky=N+S+E+W)

self.ccw = Button(self,text='C.C.W',activebackground='green',cursor='gumby',command=self.ccw)
self.ccw.grid(row=2,column=0,sticky=N+S+E+W)

self.stop = Button(self,text='Stop',activebackground='red',cursor='gumby',command=self.stop)
self.stop.grid(row=2,column=1,sticky=N+S+E+W)

self.cw = Button(self,text='C.W',activebackground='green',cursor='gumby',command=self.cw)
self.cw.grid(row=2,column=2,sticky=N+S+E+W)

self.down = Button(self,text='B Down',activebackground='green',cursor='gumby',command=self.bdown)
self.down.grid(row=3,column=1,sticky=N+S+E+W)

self.wup = Button(self,text='W Up',activebackground='green',cursor='gumby',command=self.wup)
self.wup.grid(row=1,column=4,sticky=N+S+E+W)

self.wstop = Button(self,text='W Stop',activebackground='red',cursor='gumby',command=self.wstop)
self.wstop.grid(row=2,column=4,sticky=N+S+E+W)

self.wdown = Button(self,text='W Down',activebackground='green',cursor='gumby',command=self.wdown)
self.wdown.grid(row=3,column=4,sticky=N+S+E+W)


def bup(self):
global bdown
global bup
if bdown==0:
bup = 1
init(the_port)
output(2, True)
close(the_port)

def ccw(self):
init(the_port)
output(3, True)
close(the_port)

def stop(self):
global bdown
global bup
bdown = 0
bup = 0
init(the_port)
output(2, False)
output(3, False)
close(the_port)

def cw(self):
init(the_port)
output(3, False)
close(the_port)

def bdown(self):
global bdown
global bup
if bup==0:
bdown = 1
init(the_port)
output(3, True)
close(the_port)

def wup(self):
init(the_port)
output(2, True)
time.sleep(1)
output(3, True)
close(the_port)

def wstop(self):
for x in range(1, 16):
ser.write("7")

def wdown(self):
for x in range(1, 16):
ser.write("8")



app = MyApp()
app.master.title("Serial Adruino Uno ")
app.mainloop()



what i tried to do :
bup =0
bdown = 0
stop = bdown and bup set to 0

is there a easy way to do this in python ?
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  #2  
Old July 9th, 2012, 09:47 AM
b49P23TIvg's Avatar
b49P23TIvg b49P23TIvg is offline
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you changed the datatype of your global variables from string to integer. Whatever. This solution doesn't depend on that. Look at the bup method for an idea about solving your problem. self.down.config(state=DISABLED)
Code:
#!/usr/bin/env python
from Tkinter import *
print('from arduinoController import *')
the_port = '/dev/ttyACM0'
print('close(the_port)')
print('init(the_port)')
bup = '0'
bdown = '0'


class MyApp(Frame):

    def __init__(self,master=None):
        Frame.__init__(self,master)
        self.grid(sticky=N+S+E+W)
        self.createWidgets()

    def createWidgets(self):
        top=self.winfo_toplevel()
        top.rowconfigure(0,weight=1)
        top.columnconfigure(0,weight=1)
        self.rowconfigure(0,weight=1)
        self.columnconfigure(0,weight=1)

        self.up = Button(self,text='B Up',activebackground='green',cursor='gumby',command=self.bup)
        self.up.grid(row=1,column=1,sticky=N+S+E+W)

        self.ccw = Button(self,text='C.C.W',activebackground='green',cursor='gumby',command=self.ccw)
        self.ccw.grid(row=2,column=0,sticky=N+S+E+W)

        self.stop = Button(self,text='Stop',activebackground='red',cursor='gumby',command=self.stop)
        self.stop.grid(row=2,column=1,sticky=N+S+E+W)

        self.cw = Button(self,text='C.W',activebackground='green',cursor='gumby',command=self.cw)
        self.cw.grid(row=2,column=2,sticky=N+S+E+W)

        self.down = Button(self,text='B Down',activebackground='green',cursor='gumby',command=self.bdown)
        self.down.grid(row=3,column=1,sticky=N+S+E+W)

        self.wup = Button(self,text='W Up',activebackground='green',cursor='gumby',command=self.wup)
        self.wup.grid(row=1,column=4,sticky=N+S+E+W)

        self.wstop = Button(self,text='W Stop',activebackground='red',cursor='gumby',command=self.wstop)
        self.wstop.grid(row=2,column=4,sticky=N+S+E+W)

        self.wdown = Button(self,text='W Down',activebackground='green',cursor='gumby',command=self.wdown)
        self.wdown.grid(row=3,column=4,sticky=N+S+E+W)


    def bup(self):
        self.down.config(state=DISABLED)
        print('init(the_port)')
        print('output(2, True)')
        print('close(the_port)')

    def ccw(self):
        print('init(the_port)')
        print('output(3, True)')
        print('close(the_port)')

    def stop(self):
        global bdown
        global bup
        bdown = 0
        bup = 0
        print('init(the_port)')
        print('output(2, False)')
        print('output(3, False)')
        print('close(the_port)')

    def cw(self):
        print('init(the_port)')
        print('output(3, False)')
        print('close(the_port)')

    def bdown(self):
        global bdown
        global bup
        if bup==0:
            bdown = 1
        print('init(the_port)')
        print('output(3, True)')
        print('close(the_port)')

    def wup(self):
        print('init(the_port)')
        print('output(2, True)')
        print('time.sleep(1)')
        print('output(3, True)')
        print('close(the_port)')

    def wstop(self):
        for x in range(1, 16):
            print('ser.write("7")')

    def wdown(self):
        for x in range(1, 16):
            print('ser.write("8")')

app = MyApp()
app.master.title("Serial Adruino Uno ")
app.mainloop()
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  #3  
Old July 9th, 2012, 05:44 PM
klein5366 klein5366 is offline
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good day
thank you b49P23TIvg

after butting my head with global i final found that i could make another file and put my variables in there and import the file then Wright back and forth to them.

but i am going to try this, when importing the variables from another file every time i open the gui and it connects to my arduino i have to click on each stop buttons before it lets me turn anything on.
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  #4  
Old July 9th, 2012, 09:37 PM
klein5366 klein5366 is offline
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Global in python not working as expected
good day
thank you b49P23TIvg

got disabling buttons working and it works much better that using variables i'm going to post my working code if others need an example.

python Code:
Original - python Code 
  1.  
  2. #!/usr/bin/env python
  3. from Tkinter import *
  4. from arduinoController import * 
  5. the_port = '/dev/ttyACM0'
  6. close(the_port)
  7. init(the_port)
  8.  
  9.  
  10.  
  11. class MyApp(Frame):
  12.         def __init__(self,master=None):
  13.                 Frame.__init__(self,master)
  14.                 self.grid(sticky=N+S+E+W)
  15.                 self.createWidgets()
  16.         def createWidgets(self):
  17.                 top=self.winfo_toplevel()
  18.                 top.rowconfigure(0,weight=1)
  19.                 top.columnconfigure(0,weight=1)
  20.                 self.rowconfigure(0,weight=1)
  21.                 self.columnconfigure(0,weight=1)
  22.                 
  23.                 self.up = Button(self,text='B Up',activebackground='green',cursor='gumby',command=self.bup)
  24.                 self.up.configure(state='normal')
  25.                 self.up.grid(row=1,column=1,sticky=N+S+E+W)
  26.                                                 
  27.                 self.ccw = Button(self,text='C.C.W',activebackground='green',cursor='gumby',command=self.ccw)
  28.                 self.ccw.configure(state='normal')
  29.                 self.ccw.grid(row=2,column=0,sticky=N+S+E+W)
  30.                 
  31.                 self.stop = Button(self,text='Stop',activebackground='red',cursor='gumby',command=self.stop)
  32.                 self.stop.grid(row=2,column=1,sticky=N+S+E+W)
  33.                
  34.                 self.cw = Button(self,text='C.W',activebackground='green',cursor='gumby',command=self.cw)
  35.                 self.cw.configure(state='normal')
  36.                 self.cw.grid(row=2,column=2,sticky=N+S+E+W)
  37.                
  38.                 self.down = Button(self,text='B Down',activebackground='green',cursor='gumby',command=self.bdown)
  39.                 self.down.configure(state='normal')
  40.                 self.down.grid(row=3,column=1,sticky=N+S+E+W)
  41.                 
  42.                 self.wup = Button(self,text='W Up',activebackground='green',cursor='gumby',command=self.wup)
  43.                 self.wup.configure(state='normal')
  44.                 self.wup.grid(row=1,column=4,sticky=N+S+E+W)
  45.                 
  46.                 self.wstop = Button(self,text='W Stop',activebackground='red',cursor='gumby',command=self.wstop)
  47.                 self.wstop.grid(row=2,column=4,sticky=N+S+E+W)
  48.  
  49.                 self.wdown = Button(self,text='W Down',activebackground='green',cursor='gumby',command=self.wdown)
  50.                 self.wdown.configure(state='normal')
  51.                 self.wdown.grid(row=3,column=4,sticky=N+S+E+W)
  52.                                                                     
  53.                                                                     
  54.         def bup(self):
  55.                 self.down.configure(state='disabled')               
  56.                 init(the_port)
  57.                 output(2, True)
  58.                 close(the_port)                  
  59.                                                                 
  60.         def ccw(self):
  61.                 self.cw.configure(state='disabled')
  62.                 init(the_port)  
  63.                 output(4, True)  
  64.                 close(the_port)
  65.                                
  66.         def stop(self):
  67.                 self.up.configure(state='normal')
  68.                 self.down.configure(state='normal')
  69.                 self.cw.configure(state='normal')
  70.                 self.ccw.configure(state='normal')
  71.                 init(the_port)
  72.                 output(2, False)
  73.                 output(3, False)
  74.                 output(4, False)
  75.                 output(5, False)
  76.                 close(the_port)          
  77.                                 
  78.         def cw(self):
  79.                 self.ccw.configure(state='disabled')                        
  80.                 init(the_port)  
  81.                 output(5, True)  
  82.                 close(the_port)
  83.                                 
  84.         def bdown(self):
  85.                 self.up.configure(state='disabled')
  86.                 init(the_port)
  87.                 output(3, True)
  88.                 close(the_port) 
  89.                                 
  90.         def wup(self):
  91.                 self.wdown.configure(state='disabled')
  92.                 init(the_port)   
  93.                 output(6, True)
  94.                 close(the_port)
  95.                                
  96.         def wstop(self):
  97.                 self.wup.configure(state='normal')
  98.                 self.wdown.configure(state='normal')
  99.                 init(the_port)
  100.                 output(6, False)  
  101.                 output(7, False)
  102.                 close(the_port)
  103.                                
  104.         def wdown(self):
  105.                 self.wup.configure(state='disabled')
  106.                 init(the_port)
  107.                 output(7, True)
  108.                 close(the_port)
  109.  
  110.  
  111.                                                                                                                                                
  112. app = MyApp()
  113. app.master.title("Serial Adruino Uno ")
  114. app.mainloop()




hay b49P23TIvg i learned how to use code tags too lol
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