[raspberry-vi] Re: GPIO Pin-outs
- From: "Michael A. Ray" <mike.ray@xxxxxxxxxxxxxx>
- To: raspberry-vi@xxxxxxxxxxxxx
- Date: Sat, 16 Mar 2013 21:04:53 +0000
Hello Jonathon,
You're right about the potentially confusing BCM numbering scheme.
So far I've only used wiringpi, a C library for accessing the pins and
not Python.
This isn't because I don't want to use Python but because I can't get
python-serial to work properly with the digital multimeter I am interfacing.
The dmm in question needs dsr/dtr to be held high for the comm interface
to work, because it draws a little power for the opto-couplers. And I
think when I try to use python-serial, either dsr or dtr, or both, drop
after the first byte of a 14-byte frame is received.
I'm trying to create a talking multimeter. Done it as well, but need to
switch on the soldering iron to make the lead for triggering a
measurement. Anyone know a good treatment for second degree burns of
the fingertips?
Mike
On 16/03/2013 20:53, Jonathan Horniblow (Talking Newspaper Services) wrote:
> In addition to Michael's excellent reference, it might be worth noting
> that the python RPi.GPIO library can use "real" pin numbering rather
> than the ridiculous, confusing and potentially damaging BCM numbering
> where you need to keep referring to a lookup table.
>
> https://code.google.com/p/raspberry-gpio-python/
>
> There are versions for python 3 and 2, but it should be as easy as:
>
> sudo apt-get update
> sudo apt-get install python-dev python-rpi.gpio
>
> and then in your python script
>
> import RPi.GPIO as GPIO
> GPIO.setmode(GPIO.BOARD)
> GPIO.setup(12, GPIO.OUT, initial=GPIO.HIGH)
>
> And you'll have a HIGH on pin 12. Actual real physical pin 12 that you
> can feel along to, not some bizarre alternative you need to lookup on
> a table.
>
> It's as easy as that - it can also do edge detection, input detection
> and all sorts. Read the docs.
>
> While I'm here, I don't know how accessible is it, but the Adafruit
> WebIDE rocks! Anyone tried it?
> http://learn.adafruit.com/webide/overview
>
>
> On Sat, Mar 16, 2013 at 8:31 PM, Michael A. Ray <mike.ray@xxxxxxxxxxxxxx>
> wrote:
>>
>>
>> Hello list,
>>
>> I did say I wasn't going to do this specifically and that I wasn't going
>> to duplicate content to be found on the Foundation web-site or elinux.
>>
>> But after a frustrating search for the data, and after finding several
>> conflicting entries, and the usual frustration associated with finding
>> numerous posts that say stuff like 'look at this diagram', I have put a
>> page on our wiki that details the pin-outs of the Raspi GPIO bus:
>>
>> http://www.raspberryvi.org/wiki/doku.php/gpio
>>
>> Please note the bit on the page that says it aint my fault if you blow
>> up your Raspi, or your house.
>>
>> I have checked and double and triple checked the entries in the two
>> tables and they are, as far as I can find, correct. I even checked
>> against a posting from the Foundation forums from one of the RPI team in
>> response to my appeal for help.
>>
>> Every time I type 'the Foundation' I get a mental image of Darth Vader
>> clutching a Raspi. I need to get out more.
>>
>> Mike
>>
>>
>>
>> --
>> Michael A. Ray
>>
>> Analyst/Programmer
>> Witley, Surrey, South-east UK
>>
>> github username: cromarty
>> raspberrypi.org username: cromarty
>> Ham Radio Call-sign: G4XBF, licensed since 1982
>>
>> 'Entia non sunt multiplicanda praeter necessitatem' - Ockham's razor
>>
>>
>> Raspberry VI:
>> http://www.raspberryvi.org/
>> NVDA, the best free screen-reader in the world:
>> http://www.nvda-project.org/
>>
>>
>>
>>
>> ===========================================================
>> The raspberry-vi mailing list
>> Archives: //www.freelists.org/archives/raspberry-vi
>> Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
>> -----------------------------------------------------------
>> Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
>> Foundation.
>>
>> This list is not affiliated to the Raspberry Pi Foundation and the views and
>> attitudes expressed by the subscribers to this list do not reflect those of
>> the Foundation.
>>
>> Mike Ray, list creator, January 2013
>>
> ===========================================================
> The raspberry-vi mailing list
> Archives: //www.freelists.org/archives/raspberry-vi
> Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
> -----------------------------------------------------------
> Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
> Foundation.
>
> This list is not affiliated to the Raspberry Pi Foundation and the views and
> attitudes expressed by the subscribers to this list do not reflect those of
> the Foundation.
>
> Mike Ray, list creator, January 2013
>
>
--
Michael A. Ray
Analyst/Programmer
Witley, Surrey, South-east UK
github username: cromarty
raspberrypi.org username: cromarty
Ham Radio Call-sign: G4XBF, licensed since 1982
'Entia non sunt multiplicanda praeter necessitatem' - Ockham's razor
Raspberry VI:
http://www.raspberryvi.org/
NVDA, the best free screen-reader in the world:
http://www.nvda-project.org/
===========================================================
The raspberry-vi mailing list
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
Foundation.
This list is not affiliated to the Raspberry Pi Foundation and the views and
attitudes expressed by the subscribers to this list do not reflect those of the
Foundation.
Mike Ray, list creator, January 2013
Other related posts:
