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General Category => Troubleshooting and Support => Topic started by: dani on March 16, 2014, 10:39:40 AM

Title: Using of RasPI GPIO Out
Post by: dani on March 16, 2014, 10:39:40 AM

Hi,

I need some help. I'am using RasPI with the 8 GPIO out mode to control 8 relais with optocoppler.

I got this logging text following  but the GPIO Pin signals didn't move.

2014-03-16T10:28:53.7163990+01:00 MIG.Gateways.WebServiceGateway 192.168.1.11   api/EmbeddedSystems.RaspiGPIO/4/Control.On//1394962133192   HTTP   GET

2014-03-16T10:28:57.5943470+01:00 MIG.Gateways.WebServiceGateway 192.168.1.11   api/EmbeddedSystems.RaspiGPIO/4/Control.Off/undefined/1394962137072   HTTP   GET

2014-03-16T10:29:02.9866770+01:00 MIG.Gateways.WebServiceGateway 192.168.1.11   api/EmbeddedSystems.RaspiGPIO/4/Control.On//1394962142464   HTTP   GET

2014-03-16T10:29:09.1708760+01:00 MIG.Gateways.WebServiceGateway 192.168.1.11   api/EmbeddedSystems.RaspiGPIO/4/Control.Off/undefined/1394962148648   HTTP   GET

2014-03-16T10:29:19.1299810+01:00 MIG.Gateways.WebServiceGateway 192.168.1.11   api/EmbeddedSystems.RaspiGPIO/4/Control.On//1394962158608   HTTP   GET

2014-03-16T10:29:22.8262850+01:00 MIG.Gateways.WebServiceGateway 192.168.1.11   api/EmbeddedSystems.RaspiGPIO/4/Control.Off/undefined/1394962162304   HTTP   GET

Any idea on what I forgot ?
Do I need to install a special lib on RasPI ?

Thank's for help.
Cheers.
Dani

Title: Re: Using of RasPI GPIO Out
Post by: Gene on March 16, 2014, 07:22:00 PM

HG GPIO interface uses /sys/class/gpio .
Try this:

https://sites.google.com/site/semilleroadt/raspberry-pi-tutorials/gpio

to see if it's correctly working.

g.

Title: Re: Using of RasPI GPIO Out
Post by: dani on March 17, 2014, 09:51:28 AM

Thank's Gene,

This works correctly. Only has some ports didn't work.

The port 21, in RasPI V2 the number is 27.
The ports 17 and 18 are reserved by something. I think the LIRC.

pi@raspberrypi /sys/class/gpio $ echo 17 > export
-bash: echo: erreur d'ecriture : Peripherique ou ressource occupe
pi@raspberrypi /sys/class/gpio $

I find the informations in the screenshot joigned.
So we must replace 21 by 27 for RasPI V2.
We can add : 7, 8, 9, 10, 11 if we don't use SPI control.
And we can add : 28, 29, 30, 31 with RasPI V2.

And I use the output card with 8 relais link here. Only around 10 ? on Amazon.

http://www.amazon.fr/relais-module-canaux-Arduino-Electronique/dp/B00GSY3XGA

Only I need to reverse the control On Off, Send 1 to Off and 0 to On.

Cheers.
Dani

Title: Re: Using of RasPI GPIO Out
Post by: dani on March 17, 2014, 03:25:01 PM

Just an other point.

When we send the gpio number in export file : /sys/class/gpio/export.
The generate folder has no upper case at the first letter :

pi@raspberrypi /sys/class/gpio $ ls
export  gpio23  gpio25  gpio4  gpio8      unexport
gpio22  gpio24  gpio27  gpio7  gpiochip0
pi@raspberrypi /sys/class/gpio $

So it's for that than gpio doesn't work properly.

Cheers
Dani