Recent changes to Outputs

Discussion for Outputs page

Ness — Sat, 22 May 2021 10:36:02 -0000

Your Programm runs only once.
Try it within a while loop:

import time
import RPi.GPIO as GPIO
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)
GPIO.setup(27, GPIO.OUT)
GPIO.setup(22, GPIO.OUT)
GPIO.setup(16, GPIO.OUT)

while True:
GPIO.output(16, GPIO.HIGH)
GPIO.output(17, GPIO.HIGH)
GPIO.output(27, GPIO.HIGH)
GPIO.output(22, GPIO.HIGH)

time.sleep(2)
GPIO.output(17, GPIO.LOW)
GPIO.output(27, GPIO.LOW)
GPIO.output(22, GPIO.LOW)
time.sleep(2)

GPIO.cleanup()

Discussion for Outputs page

Baris Can Yalcin — Mon, 10 May 2021 08:27:08 -0000

I am having some troubles for signalizing of Raspberry Pi digital pins.

Let me explain the problem

The thing I was trying to do make a single pin constantly open, and ON-OFF other pins

Lets say, GPIO.OUT 16 will constantly be open, meanwhile, the PIN 17, 27 and 22 will be open and close in a sequence

import time
import RPi.GPIO as GPIO
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)
GPIO.setup(27, GPIO.OUT)
GPIO.setup(22, GPIO.OUT)
GPIO.setup(16, GPIO.OUT)

GPIO.output(16, GPIO.HIGH)
GPIO.output(17, GPIO.HIGH)
GPIO.output(27, GPIO.HIGH)
GPIO.output(22, GPIO.HIGH)

time.sleep(2)
GPIO.output(17, GPIO.LOW)
GPIO.output(27, GPIO.LOW)
GPIO.output(22, GPIO.LOW)
time.sleep(2)

GPIO.cleanup()

As you see from the code, I am trying to open PIN17, 16, 27 and 22, but closing only 17, 27, 22, however, in my experimental hardware, the code does not work and I do not see the LEDS blinking, can you tell me where is the problem ?

Outputs modified by Ben Croston

Ben Croston — Tue, 11 Nov 2014 13:20:35 -0000

--- v2
+++ v3
@@ -25,7 +25,14 @@
      # or
     GPIO.output(12, False)

-4\. Clean up at the end of your program 
+4\. To output to several channels at the same time:
+
+    :::python
+    chan_list = (11,12)
+    GPIO.output(chan_list, GPIO.LOW) # all LOW
+    GPIO.output(chan_list, (GPIO.HIGH,GPIO.LOW))  # first LOW, second HIGH
+
+5\. Clean up at the end of your program 

     :::python
     GPIO.cleanup()

Outputs modified by Ben Croston

Ben Croston — Sat, 21 Dec 2013 22:45:08 -0000

--- v1
+++ v2
@@ -1,13 +1,15 @@
 # GPIO Outputs

 1\. First set up RPi.GPIO (as described [here](BasicUsage)) 
-    
+
+    :::python
     import RPi.GPIO as GPIO
     GPIO.setmode(GPIO.BOARD)
     GPIO.setup(12, GPIO.OUT)

 2\. To set an output high: 
-    
+
+    :::python
     GPIO.output(12, GPIO.HIGH)
      # or
     GPIO.output(12, 1)
@@ -15,7 +17,8 @@
     GPIO.output(12, True)

 3\. To set an output low: 
-    
+
+    :::python
     GPIO.output(12, GPIO.LOW)
      # or
     GPIO.output(12, 0)
@@ -23,9 +26,11 @@
     GPIO.output(12, False)

 4\. Clean up at the end of your program 
-    
+
+    :::python
     GPIO.cleanup()

 Note that you can read the current state of a channel set up as an output using the input() function. For example to toggle an output: 
-    
+
+    :::python    
     GPIO.output(12, not GPIO.input(12))

Outputs modified by Anonymous

Anonymous — Wed, 18 Dec 2013 16:59:34 -0000

GPIO Outputs

1. First set up RPi.GPIO (as described here)

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)

2. To set an output high:

GPIO.output(12, GPIO.HIGH)
 # or
GPIO.output(12, 1)
 # or
GPIO.output(12, True)

3. To set an output low:

GPIO.output(12, GPIO.LOW)
 # or
GPIO.output(12, 0)
 # or
GPIO.output(12, False)

4. Clean up at the end of your program

GPIO.cleanup()

Note that you can read the current state of a channel set up as an output using the input() function. For example to toggle an output:

GPIO.output(12, not GPIO.input(12))