Unable to use GPIO

[samuel_john64]

I try to run this code to trigger my relay no changes on the GPIO. I have tried to make it active high using terminal to write command gpio write 7 0 it changes once than i try to change it back to high the gpio still stays low. What should i do to solve this issue?

Code: Select all

import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(7,GPIO.OUT)
try:
      while True:
   GPIO.output(7, GPIO.LOW)
   print("0")
   time.sleep(1)
   GPIO.output(7, GPIO.HIGH)
   print("1")
   time.sleep(1)


finally:
   # Reset the GPIO Pins to a safe state
   GPIO.output (7, GPIO.LOW)
   GPIO.cleanup()

[DougieLawson]

Try fixing the indentation.

Code: Select all

import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(7,GPIO.OUT)
try:
     while True:
        GPIO.output(7, GPIO.LOW)
        print("0")
        time.sleep(1)
        GPIO.output(7, GPIO.HIGH)
        print("1")
        time.sleep(1)

except:
   # Reset the GPIO Pins to a safe state
   GPIO.output (7, GPIO.LOW)
   GPIO.cleanup()

[samuel_john64]

I have tried but no change happen. in command it changes when mode into either in or our (gpio mode 0 IN or gpio mode 0 IN) but the output doesn't change when write command write "write 0 0" or "write 0 1" on the result.

Try fixing the indentation.

Code: Select all

import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(7,GPIO.OUT)
try:
     while True:
        GPIO.output(7, GPIO.LOW)
        print("0")
        time.sleep(1)
        GPIO.output(7, GPIO.HIGH)
        print("1")
        time.sleep(1)

except:
   # Reset the GPIO Pins to a safe state
   GPIO.output (7, GPIO.LOW)
   GPIO.cleanup()

[DougieLawson]

Have you connected to the right pin? https://pinout.xyz/pinout/pin7_gpio4

[samuel_john64]

yap its the right pin because the changed happen in change the mode into input or output for the pin.

Have you connected to the right pin? https://pinout.xyz/pinout/pin7_gpio4

[pcmanbob]

I try to run this code to trigger my relay no changes on the GPIO. I have tried to make it active high using terminal to write command gpio write 7 0 it changes once than i try to change it back to high the gpio still stays low. What should i do to solve this issue?

Code: Select all

import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(7,GPIO.OUT)
try:
      while True:
   GPIO.output(7, GPIO.LOW)
   print("0")
   time.sleep(1)
   GPIO.output(7, GPIO.HIGH)
   print("1")
   time.sleep(1)


finally:
   # Reset the GPIO Pins to a safe state
   GPIO.output (7, GPIO.LOW)
   GPIO.cleanup()

Hi.

first off are you sure its not your relay that's not changing state because its a 5v device?
to test your code/pin replace the relay with an LED and 330ohm resistor and see if that turns on and off.
if LED option works ok post details of the relay board you are trying to use.