Wikiuser: Created page with "The following code was created to demonstrate how to create a Graphical User Interface (GUI) using the Python module Tkinter, as well as communicate with an Arduino using the ..."

2014-03-21T22:35:55Z

Created page with "The following code was created to demonstrate how to create a Graphical User Interface (GUI) using the Python module Tkinter, as well as communicate with an Arduino using the ..."

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The following code was created to demonstrate how to create a Graphical User Interface (GUI) using the Python module Tkinter, as well as communicate with an Arduino using the module PySerial. The code will not work without these modules.

== Python Code ==

"""A simple program to create a GUI to communicate with an Arduino and toggle an LED on and off.
Created to demonstrate how to use Python with tkinter to create a GUI.
- Colin Diehl
"""
from tkinter import * #import the modules for the GUI
import serial #and the serial communications

PORT = "COM5"
ser = serial.Serial(PORT, 9600) #start the serial com w/ 9600 baudrate

class Application(Frame): #create the class for the GUI to run
def __init__(self, master):
Frame.__init__(self, master)
self.grid() # create the grid on the GUI for the part to snap onto
self.create_widgets() #the function to create the GUI parts

def create_widgets(self): #define all GUI parts
self.label = Label(self) #create a label
self.label["text"] = "Use the button to toggle the LED on and off:" #set the text of the label
self.label.grid( row = 0, column = 0)#snap the label to the top left of the grid

self.button = Button(self) #create a button
self.button["text"] = "LED: OFF" #set the original text of the button
self.button["height"] = 2 #set the height of the button to 2 characters tall
self.button["width"] = 12 #set the button width to 12 characters wide
self.button["command"] = self.toggle #the function the button will run when pressed
self.button.grid(row = 1, column = 0) #snap the button to the second row of the grid

self.text = Text(self) #create a text box
self.text["height"] = 2 #set the text box height to 2 characters
self.text["width"] = 20 #set the text box width to 20 characters
self.text.grid(row = 2, column = 0) #snap the text box to the third row of the grid

self.end = Button(self) #create another button to end the program
self.end["text"] = "END" #set the text on the button
self.end["height"] = 2 #set the button height to 2 characters
self.end["width"] = 12 #set the button width to 12 characters
self.end["bg"] = "red" #set the background color of the button to red
self.end["command"] = self.quit #the quit function the button will run
self.end.grid(row = 2, column = 1, sticky = E) #snap the button to the right side of the third row, second column(

def toggle(self): #define the function from the first button
index_dict={"OFF": "ON" , "ON": "OFF"} #define a sequence that switches from off to on to off
index[0] = index_dict[index[0]] #progresses through the sequence, toggling the inital string in the sequence
self.button["text"] = "LED: " + str(index[0]) #updates the button text with the current state of the LED
if index[0] == "OFF": #when the inital string is off
ser.write(bytes("a", encoding="ascii")) #writes lowercase a into the serial com, Arduino reads and sets output low
self.text.delete(0.0, END) #deletes the contents of the text box
self.text.insert(0.0, "The LED is OFF") #inserts the string into the text box to display OFF state of the LED
if index[0] == "ON": #when the inital string is on
ser.write(bytes("A", encoding="ascii")) #writes uppercase A into the serial com, Arduino reads and sets output high
self.text.delete(0.0, END) #clears the text box
self.text.insert(0.0, "The LED is ON") #inserts the string into the text box to display ON state of the LED

def quit(self): #define the function to kill the program
ser.write(bytes("a", encoding="ascii")) #write lowercase a into serial com, to make sure LED goes off when program ends
ser.close() #close the serial communication
root.destroy() #destroy the GUI

index = ["OFF"] #set the intial string in the sequence to off, LED starts off
root.title("GUI Demo") #title the GUI window
root = Tk() #these three lines start and run the GUI window in a loop
app = Application(root)
root.mainloop()

= Arduino Code ==

const int led = 12; // define led as the constant integer 12
// connect the positive end of the LED to pin 12 of the Arduino
char val; //define a variable val as a character

void setup(){
Serial.begin(9600); // begin the serial communication with a baudrate of 9600
pinMode(led, OUTPUT); //set led (pin 12) as a digital output
}

void loop(){
if (Serial.available()){ //run only if there is serial communication available
val = Serial.read(); //read the serial communication and set val as the read value
if (val == 'A'){ // if val is equal to uppercase A
digitalWrite(led, HIGH); // set the led pin to high, turn the led on
}
if (val == 'a'){ // if val is equal to lowercase a
digitalWrite(led, LOW); // set the led pin to low, turn the led off
}
}
delay(100); //sleep for a tenth of a second before the loop begins again
}

Python GUI Demo - Revision history

Wikiuser: Created page with "The following code was created to demonstrate how to create a Graphical User Interface (GUI) using the Python module Tkinter, as well as communicate with an Arduino using the ..."