raspberry pi - python GPIO pins won't cleanup -


i beginer python , decided give go on raspberry pi. learned python small book covers basics, combined demo change tkinter window background color toggle button , lighting led code:

#! /usr/bin/env python import rpi.gpio gpio gpio.setmode(gpio.board); gpio.setup(7, gpio.out) gpio.output(7, false) tkinter import* window = tk() window.title("relay button") window.configure(bg= "green") btn_end= button(window, text = "close", command=exit) def tog():         if ( gpio.input(7) == true ):                 gpio.output(7, false)         else:                 gpio.output(7, true) btn_tog=button( window, text="switch", command=tog) btn_end.pack(padx=100, pady=20) btn_tog.pack(padx=100, pady=20) window.mainloop() gpio.cleanup()

i error :

relaybutton.py:3: runtimewarning: channel in use, continuing anyway.  use gpio.setwarnings(false) disable warnings.   gpio.setmode(gpio.board); gpio.setup(7, gpio.out)

i have no clue why error, have @ end gpio.cleanup().

that's because program not executing part of code. when write tkinter application, mainloop() infinite loop.

you can modify code make work.

#! /usr/bin/env python import rpi.gpio gpio tkinter import* def on_closing():     gpio.cleanup()     window.destroy() gpio.setmode(gpio.board);  gpio.setup(7, gpio.out) gpio.output(7, false) window = tk() window.title("relay button") window.configure(bg= "green") btn_end= button(window, text = "close", command=exit) def tog():         if ( gpio.input(7) == true ):                 gpio.output(7, false)         else:                 gpio.output(7, true) btn_tog=button( window, text="switch", command=tog) btn_end.pack(padx=100, pady=20) btn_tog.pack(padx=100, pady=20) window.protocol("wm_delete_window", on_closing) window.mainloop()

you can see binded on_closing function clean , destroy tk.tk window. hope helps.


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