GPIO question

Setup, Configuration and Use Beginners
1

Hi All,

I’m testing out a PIR motion sensor connecting via a GPIO port on a Raspberry Pi. So far I’m at the point where I can see the motion sensor activating when running “gpio read 4” while the sensor is plugged into physical pin 16. This corresponds to the information I’m seeing when I run gpio readall below even though it doesn’t correspond to what I thought were the standard GPIO pinouts. As below.

±----±----±--------±-----±–±--Pi 2—±–±-----±--------±----±----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
±----±----±--------±-----±–±—+±—±–±-----±--------±----±----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5V | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
±----±----±--------±-----±–±—+±—±–±-----±--------±----±----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
±----±----±--------±-----±–±--Pi 2—±–±-----±--------±----±----+

I’ve also created the following item as a test to see if I can see the contact state change via debug.

Contact PIR “PIR” (gLiving) { gpio=“pin:4 activelow:yes” }

The issue I have is that when running “tail -f /var/log/openhab/openhab.log” I get the following

2016-01-11 20:58:32.810 [DEBUG] [i.internal.GenericItemProvider] - Start processing binding configuration of Item ‘PIR (Type=ContactItem, State=Uninitialized)’ with ‘GPIOGenericBindingProvider’ reader.

So even though I can see the state changing via gpio I can’t see any state change in the debug logs.

Any suggestions would be appreciated.

regards,
Michael.

2

Bump.

Any suggestions on what I should be looking for? the debug doesn’t appear to be throwing any issues but I’m still not seeing state changes in the logs.

regards,
Michael.

3

which version of OH and debian are you running?
have you had a look at this thread? → GPIO read problem

4

Thanks Stefan. I did see that thread and am pretty sure I used the Wheezy version but will recheck tonight just in case.

5

Success. I had installed the NOOBS OS which does appear to be based on Jessie. I reinstalled with wheezy and can now see state changes in the logs. Interestingly gpio readall shows the state change happening on pin 4 while Openhab sees it on pin 23 (Openhab is correct). A bit odd but I’ll live with it.

Feeling a bit stupid as I did read this but didn’t click when I installed the OS. Thanks for your help.