Python script failing with AttributeError: LED instance has no attribute '__trunc__'

Question

I am currently bread-boarding two LEDs with 560 mOh resistors connected to the RPi over a ribbon cable that connects to the breadboard with a Pi Cobbler.

The problem I am getting isn't with the hardware, it's with the script. When I run it, I get this error:

 led_g-r.py:11: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings. GPIO.setup(GREEN_LED, GPIO.OUT) led_g-r.py:16: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings. GPIO.setup(RED_LED, GPIO.OUT) Traceback (most recent call last): File "led_g-r.py", line 59, in main() File "led_g-r.py", line 56, in main green.flash(3) File "led_g-r.py", line 33, in flash for flash in range(0, repeat): AttributeError: LED instance has no attribute '__trunc__' 

Can anyone see the problem in my code (included below). I wrote the script myself and I'm rather new to python so I probably will have a few problems/code that could be done better.

I wrote this with a class so that I could change around my projects with different LED configurations.

This is the code:

import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) class LED: def __init__(self, color, pin): self.color = color.lower() if self.color == 'green': GREEN_LED = pin GPIO.setup(GREEN_LED, GPIO.OUT) self.LED = 'GREEN_LED' elif self.color == 'red': RED_LED = pin GPIO.setup(RED_LED, GPIO.OUT) self.LED = 'RED_LED' def OFF(): GPIO.output(self.LED, False) def ON(): GPIO.output(self.LED, True) def flash(repeat=1, length=1, cust=0): # repeat is automatically 1 # cust is automatically 0 # length is automatically 1: # 1 = short-on/off for 3sec. # 2 = medium-on for 5sec. off for 3sec. # 3 = long-on for 10sec. off for 3 sec. # 4 = custom-set cust=length on in sec. for flash in range(0, repeat): ON() if length == '1': time.sleep(3) elif length == '2': time.sleep(5) elif length == '3': time.sleep(10) elif length == '4': time.sleep(self.cust) OFF() time.sleep(3) ON() def SOS(repeat=1): flash(3, 1) flash(3, 3) flash(3, 1) def main(): green = LED('green', 18) red = LED('red', 23) green.flash(3) red.flash(3) main() 

Thanks!

PS...If it helps, I can post a picture of the configuration. I also have connected my USB to TTL Console Cable so I can connect to the pi without having to use my awful screen.

Answer 1

Restart your Pi, and then use this code to clean up the GPIO pins when your program exits:

GPIO.cleanup() 

The next time your program runs it should work.