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I have just started with the GPIO on my raspberry pi but can't get any of the code to work.

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(18,GPIO.OUT)
print "LED on"
GPIO.output(18,GPIO.HIGH)
time.sleep(1)
print "LED off"
GPIO.output(18,GPIO.LOW)

I have tried using both pin 12 and 18. I have the led connected to ground (pin 6) through a resistor and to pin 12. It looks like this

enter image description here

  • In that case you either have the LED back to front, or it is broken, or the resistor has much too large a value. Pin 12 is GPIO18. – joan Oct 28 '16 at 15:23
  • @joan it works when I just connect it to pin 1 – Rob M Oct 28 '16 at 15:31
  • The code is fine and toggles GPIO18. – joan Oct 28 '16 at 15:35
  • @joan then why doesn't the led light up – Rob M Oct 28 '16 at 15:37
  • The only other possibilities I can think of is your GPIO18 is broken or you are not connecting the LED to GPIO18. A photo will help with the latter. – joan Oct 28 '16 at 15:40
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GPIO 18 is on pin 12.

GPIO 24 is on pin 18.

GPIO       pin  pin    GPIO
3V3         1    2      5V
0/2 (SDA)   3    4      5V
3 (SCL)     5    6      0V
4           7    8      14 (TXD)
0V          9   10      15 (RXD)
17 (ce1)   11   12      18 (ce0)
27         13   14      0V
22         15   16      23
3V3        17   18      24
10 (MOSI)  19   20      0V
9 (MISO)   21   22      25
11 (SCLK)  23   24      8 (CE0)
0V         25   26      7 (CE1)
           .......
0 (ID_SD)  27   28      1 (ID_SC)
5          29   30      0V
6          31   32      12
13         33   34      0V
19 (miso)  35   36      16 (ce2)
26         37   38      20 (mosi)
0V         39   40      21 (sclk)
  • I meant that the led was connected to pin 12 then but I have also changed the code to pin 18. – Rob M Oct 28 '16 at 14:53

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