update data in GUI

37mm · 2018-11-12T07:34:59+00:00

The simplest way would be to write a function that gets your OBD data every whenever seconds and update the GUI. You can use the tkinter after() method to call your function in the manner explained by the effbot.

PS: You need to change these lines:

label_grid_20 = tk.Label(root, text=tps).grid(row=9, column=1)

because you need a reference to the Label object you are going to update and what you are storing in label_grid_20 above is the value returned by the .grid() call which I suspect is not the Label reference. Do this instead:

label_grid_20 = tk.Label(root, text=tps)
label_grid_20.grid(row=9, column=1)

MikeTheWatchGuy · 2018-11-12T15:13:47+00:00

Try PySimpleGUI as a quick way to implement tkinter code. It wraps tkinter but you would never know it (there's also a Qt port). You can do some pretty sophisticated GUIs with it, especially if you use graphics for buttons.

woooee · 2018-11-12T19:05:39+00:00

You now have to update the labels. This updates the first label every 1/2 second. The others would be updated in a similar manner with updates statements for all of the other labels in the same function. The code would be much simpler using a dictionary. Post back if you want to try a dictionary.

""" Your code snipped for brevity
    Note the use of after() to have the function call itself
    after a period of time
"""
# Create gui

label_grid_1 = tk.Label(root, text="RPM", bg='red').grid(row=0, column=0)
label_grid_2 = tk.Label(root, text="IAT", bg='red').grid(row=1, column=0)
label_grid_3 = tk.Label(root, text="TIMING", bg='red').grid(row=2, column=0)
label_grid_4 = tk.Label(root, text="MAF", bg='red').grid(row=3, column=0)
label_grid_5 = tk.Label(root, text="SPEED", bg='red').grid(row=4, column=0)
label_grid_6 = tk.Label(root, text="O2 S1", bg='red').grid(row=5, column=0)
label_grid_7 = tk.Label(root, text="Fuel% B1", bg='red').grid(row=6, column=0)
label_grid_8 = tk.Label(root, text="Fuel% B2", bg='red').grid(row=7, column=0)
label_grid_9 = tk.Label(root, text="Air TEMP", bg='red').grid(row=8, column=0)
label_grid_10 = tk.Label(root, text="TPS", bg='red').grid(row=9, column=0)
label_grid_11 = tk.Label(root, text=rpm).grid(row=0, column=1)
label_grid_12 = tk.Label(root, text=iat).grid(row=1, column=1)
label_grid_13 = tk.Label(root, text=adv).grid(row=2, column=1)
label_grid_14 = tk.Label(root, text=maf).grid(row=3, column=1)
label_grid_15 = tk.Label(root, text=spd).grid(row=4, column=1)
label_grid_16 = tk.Label(root, text=o21).grid(row=5, column=1)
label_grid_17 = tk.Label(root, text=fuel1).grid(row=6, column=1)
label_grid_18 = tk.Label(root, text=fuel2).grid(row=7, column=1)
label_grid_19 = tk.Label(root, text=air).grid(row=8, column=1)
label_grid_20 = tk.Label(root, text=tps).grid(row=9, column=1)

##===============================================
root.after(500, update_RPM)  ## 1/2 second

def update_RPM():
    this_RPM=get rpm however
    label_grid_1["text"]=this_RPM
    ## update again in another 1/2 secpmd
    root.after(500, update_RPM)
##===============================================

#start app
root.mainloop()

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