[kiwiverde]

Salve, come mai mi dice che i led o meglio il pin è già stato usato ? e non posso usare il solito led per fare on , off, blink, fade.

vi allego codice:

Codice:

#!/usr/bin/env python3
from gpiozero import *
from time import sleep

led = LED(18)
button = Button(21)
def main():
    cmd = input("on, off  , blink , button: ")
    if cmd == 'on':
        led.on()
        main()
    elif cmd == 'off':
        led.off()
        main()
    elif cmd == 'blink':
        try:
            while True:
                led.on()
                sleep(1)
                led.off()
                sleep(1)
        except KeyboardInterrupt:
            led.off()
            sleep(1)
            main()
    elif cmd == 'button':
        try:
            while True:
                if button.is_pressed:
                    led.on()
                else:
                    led.off()
        except KeyboardInterrupt:
            led.off()
            sleep(0.5)
            main()
    elif cmd == 'pwm':
        led_pwm = PWMLED(18)
        try:
            while True:
                
                led_pwm.value = 0
                sleep(1)
                led_pwm.value = 0.5
                sleep(1)
                led_pwm.value = 1
                sleep(1)
                led_pwm.value = 0
                sleep(1)
                led_pwm.value = 0.5
                sleep(1)
                led_pwm.value = 1
                sleep(1)
        except KeyboardInterrupt:
            led.off()
            sleep(0.5)
            main()


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        led.off()

Grazie mille.

[Zzed]

pubblica l'errore esatto che ti viene presentato (compreso il ^)

[Enrico Sartori]

Prova ad usare pin senza funzioni secondarie, tipo il 17, 27

https://it.pinout.xyz/pinout/pin40_gpio21
https://it.pinout.xyz/pinout/pin12_gpio18

[kiwiverde]

ok , ora provo appena sistema di nuovo raspberry e provo grazie mille. vedo come risolvere.

---

ecco l'errore che ricevo :
>>> %Run app.py
on, off , blink , button: pwm
Traceback (most recent call last):
File "/home/pi/Desktop/Labs/app.py", line 62, in <module>
main()
File "/home/pi/Desktop/Labs/app.py", line 38, in main
led_pwm = PWMLED(17)
File "/usr/lib/python3/dist-packages/gpiozero/devices.py", line 124, in __call__
self = super(GPIOMeta, cls).__call__(*args, **kwargs)
File "/usr/lib/python3/dist-packages/gpiozero/output_devices.py", line 414, in __init__
pin, active_high, initial_value=None, pin_factory=pin_factory
File "/usr/lib/python3/dist-packages/gpiozero/output_devices.py", line 93, in __init__
super(OutputDevice, self).__init__(pin, pin_factory=pin_factory)
File "/usr/lib/python3/dist-packages/gpiozero/mixins.py", line 106, in __init__
super(SourceMixin, self).__init__(*args, **kwargs)
File "/usr/lib/python3/dist-packages/gpiozero/devices.py", line 520, in __init__
self.pin_factory.reserve_pins(self, pin)
File "/usr/lib/python3/dist-packages/gpiozero/pins/pi.py", line 100, in reserve_pins
requester, *(self.pi_info.to_gpio(pin) for pin in pins))
File "/usr/lib/python3/dist-packages/gpiozero/pins/__init__.py", line 98, in reserve_pins
(pin, reserver))
gpiozero.exc.GPIOPinInUse: pin 17 is already in use by <gpiozero.LED object on pin GPIO17, active_high=True, is_active=False>
>>>

[kiwiverde]

ok, riuscito anche usare il pin di prima ma devo mettere led.close()

una cosa per risvegliarlo .. perché se faccio led.close e ripeto tipo il comando on, mi dice che i led è stato chiuso.

avete idea come riassegnarli il valore?


grazie mille.

---

ok, riuscito devo riassegnarli il valore.. ma mi sembra brutto cosi.. avete idea come fare senza ripetere l'assegnazione. Vi posto il codice:

Codice:

#!/usr/bin/env python3
from gpiozero import *
from time import sleep

led = LED(18)
button = Button(21)
def main():
    global led, button
    cmd = input("on, off  , blink , button, pwm: ")
    if cmd == 'on':
        led.on()
        main()
    elif cmd == 'off':
        led.off()
        main()
    elif cmd == 'blink':
        try:
            while True:
                led.on()
                sleep(1)
                led.off()
                sleep(1)
        except KeyboardInterrupt:
            led.off()
            sleep(1)
            main()
    elif cmd == 'button':
        try:
            while True:
                if button.is_pressed:
                    led.on()
                else:
                    led.off()
        except KeyboardInterrupt:
            led.off()
            sleep(0.5)
            main()
    elif cmd == 'pwm':
        led.close()
        sleep(.5)
        led = PWMLED(18)
        try:
            while True:
                
                led.value = 0
                sleep(1)
                led.value = 0.5
                sleep(1)
                led.value = 1
                sleep(1)
                led.value = 0
                sleep(1)
                led.value = 0.5
                sleep(1)
                led.value = 1
                sleep(1)
        except KeyboardInterrupt:
            led.off()
            sleep(0.5)
            led.close()
            sleep(0.5)
            led = LED(18)
            sleep(0.5)
            main()


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        led.off()

in questo pezzo di codice:

Codice:

elif cmd == 'pwm':
        led.close()
        sleep(.5)
        led = PWMLED(18)
        try:
            while True:
                
                led.value = 0
                sleep(1)
                led.value = 0.5
                sleep(1)
                led.value = 1
                sleep(1)
                led.value = 0
                sleep(1)
                led.value = 0.5
                sleep(1)
                led.value = 1
                sleep(1)
        except KeyboardInterrupt:
            led.off()
            sleep(0.5)
            led.close()
            sleep(0.5)
            led = LED(18)
            sleep(0.5)
            main()

e l'uscita dalla CTRL+C, devo rimettere led = LED(18).

Una cosa più carina c'è ?

grazie mille e buona settimana.