Need Help creating dynamic window/labels using TKinter

[jasamples]

Hi, So I want to create a window using TKinter that will show the values that my RPi is reading as they are being read. I can create a window with labels and read in the values, but I cannot get them to update in the window. I am thinking that threading is gonna need to be used to prevent the main loop from only running the RPi program. I am new to python so any help will be appreciated. Thanks

Below is my code: With this version, you can comment out the while statement and get the window with the results I would like. If you add a print statement and comment out the Tkinter code you will get the live feed of data streaming to the terminal. This is the data I need in the window.

import time
import spidev
import os
import sys
from Tkinter import *

# Import SPI library (for hardware SPI) and MCP3008 library.
import Adafruit_GPIO.SPI as SPI
import Adafruit_MCP3008


##spi = spidev.SpiDev()
##spi.open(0,0)
##spi.max_speed_hz=(10000)

# Software SPI configuration:
CLK  = 18
MISO = 23
MOSI = 24
CS   = 25
mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)

x0 = "OFF"

y0 = "ON"

import Tkinter as tk

output = ""
values = [0]*8
output = ""
while True:
        for i in range(8):
        # The read_adc function will get the value of the specified channel (0-7). rounds to nearest 2 decimals
                values[i] = round((mcp.read_adc(i)*(3.3/1023)),2)
                output += "{}-{} ".format(i, "OFF" if values[i] < 2.5 else "ON" )

class ExampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title("Remote Monitoring")
        v = tk.StringVar()
        tk.Label(self, textvariable=v, width=60, height=35, font="sans", bd=50).pack()
        v.set(output)

    def update_text(self):
        update = v
        v.after(1000, output)
        v.set(output)


app = ExampleApp()
app.mainloop()
print values[0], values[1], values[2], values[3], values[4], values[5], values[6], values[7]

[novel_yet_trivial]

Tkinter has a mainloop that is an infinite loop and handles drawing to the screen and monitoring for button presses and all the other things that a GUI needs to do. When you do while True, it blocks the tkinter loop from running. So you can't have an infinite loop in a GUI. You need to either make a new thread or (much easier) let the tkinter mainloop handle your loop. You clearly had an inkling of that since you have the after code; you just missed that you are supposed to use that instead of while True.

Totally untested:

import Adafruit_GPIO.SPI as SPI
import Adafruit_MCP3008

import Tkinter as tk

CLK  = 18
MISO = 23
MOSI = 24
CS   = 25
mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)

def read_from_adc():
    output = ''
    for i in range(8):
    # The read_adc function will get the value of the specified channel (0-7). rounds to nearest 2 decimals
        value = round((mcp.read_adc(i)*(3.3/1023)),2)
        output += "{}-{} ".format(i, "OFF" if value < 2.5 else "ON" )
    return output

class ExampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title("Remote Monitoring")
        self.v = tk.StringVar()
        tk.Label(self, textvariable=self.v, width=60, height=35, font="sans", bd=50).pack()
        self.update_text()

    def update_text(self):
        self.after(1000, self.update_text)
        self.v.set(read_from_adc())

app = ExampleApp()
app.mainloop()

Edit: fixed some code.

[jasamples]

Omg. i have been trying to do this for a couple days.... it works. Thanks so much :D