Tkinter button only works once
You can't import a module multiple times. Each additional import for the same module is a NOP. You need to functionize whatever is in sendRF, and call that function in test_function.
You can check if the function is working correctly by adding a simple print statement inside your function
from tkinter import *#create a windowwindow =Tk()window.title("Chappers Home Automation project")#define a functiondef test_function (): import SendRF print('CHECK') #create a buttonB = Button(text ="Test Button 1", command=test_function)B.pack(padx = 100, pady = 50)window.mainloop()
It is working one time, cause you alredy have the SendRf function mported, you need to close it, after to import again