New subject: Sensors GPIO Raspberry Pi Pd

12 Apr 2013 · *Julian Brooks*

Hey all,

Some success finally:

Hurrah!!

The scl breakout pin on the pi proto plate wasn't working properly.

When unscrewed halfway it works, when fully screwed in it doesn't.

So - now got this:

i2cdetect -y 0

0 1 2 3 4 5 6 7 8 9 a b c d e f

00: -- -- -- -- -- -- -- 0a -- -- -- -- --

10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

70: -- -- -- -- -- -- -- --

and

i2cdump -y 0 0xa
No size specified (using byte-data access)

Gives a whole host of stuff I don't yet understand but I don't care
currently as something is actually happening.

Will figure out a way of saving the console info (any hints
anyone?)  as it gets badly mangled when cutting and pasting  but
basically something like this:

i2cdump -y 0 0xa
No size specified (using byte-data access)
      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e
f                      0123456789abcdef
00: ff XX XX XX XX XX XX ff XX XX XX XX ff ff ff XX    .XXXXXX.XXXX...X
10: XX ff XX XX XX XX XX ff XX ff XX ff XX XX ff XX    X.XXXXX.X.X.XX.X
20: ff XX XX ff XX XX ff XX XX XX XX ff XX XX XX ff    .XX.XX.XXXX.XXX.
30: XX ff XX ff XX XX XX XX ff ff ff XX XX XX XX XX    X.X.XXXX...XXXXX
40: XX XX XX ff XX ff XX XX XX 64 XX XX d5 XX XX ff    XXX.X.XXXdXX?XX.
50: XX ff XX XX XX XX XX XX XX ff XX XX ff XX XX XX    X.XXXXXXX.XX.XXX
60: ff XX XX XX ff XX XX XX XX XX XX XX XX ff XX XX    .XXX.XXXXXXXX.XX
70: XX XX XX XX XX XX XX ff XX XX XX XX XX XX XX XX    XXXXXXX.XXXXXXXX
80: XX ff XX XX ff ff XX XX XX ff XX XX XX XX XX XX    X.XX..XXX.XXXXXX
90: XX XX ff XX XX ff XX ff XX ff ff XX XX ff ff XX    XX.XX.X.X..XX..X
a0: XX ff XX XX ff XX XX XX XX XX XX XX XX XX ff XX    X.XX.XXXXXXXXX.X
b0: XX XX ff XX XX XX ff XX XX ff XX XX XX XX XX XX    XX.XXX.XX.XXXXXX
c0: XX XX XX XX ff XX XX ff ff XX XX ff ff XX XX XX    XXXX.XX..XX..XXX
d0: XX XX XX XX XX ff XX ff XX XX XX XX XX ff XX ff    XXXXX.X.XXXXX.X.
e0: XX XX XX ff XX ff XX XX XX XX XX XX XX XX ff XX    XXX.X.XXXXXXXX.X
f0: ff XX ff ff XX XX XX XX XX XX XX XX XX XX ff XX    .X..XXXXXXXXXX.X

Progress at least.

Cheers,

Julian

On 12 April 2013 11:27, Julian Brooks <jbeezez@gmail.com
<mailto:jbeezez@gmail.com>> wrote:

    Message resent for thread archives with smaller picture size.

    Julian

    ---------- Forwarded message ----------
    From: *Julian Brooks* <jbeezez@gmail.com <mailto:jbeezez@gmail.com>>
    Date: 11 April 2013 19:24
    Subject: Re: [PD] Sensors GPIO Raspberry Pi Pd
    To: Martin Peach <martin.peach@sympatico.ca
    <mailto:martin.peach@sympatico.ca>>
    Cc: PD List <pd-list@iem.at <mailto:pd-list@iem.at>>

    Hey Martin / list,

    Finally got all the stuff and ...

    It’s not working!

    We spent the day soldering cables and connecting stuff up as per
    the Omron ‘App Note 01’ spec sheet.

    Started off super-conservative using the  I2C level converter
    (case 3 page 4) http://www.adafruit.com/products/757#Blog/Flickr

    We tried resistors on both sides (being super paranoid!) and
    then we took  the low (Pi) side ones off.

    We then moved on to case 2 page 3 of this same document…

    At each stage we checked with “I2Cdetect –Y 1” and nothing was
    visible.

    The grid shows no attached devices every time we run it.

    We re-booted at every stage following the various online
    tutorials/methods of setting up I2C GPIO on the Pi (checked &
    double checked).

    As you can see we’re using a pi protoplate:

    https://www.adafruit.com/products/801

    In the photo I’ve attached the cables are coded as follows:

    Orange           GND

    Yellow            5v

    Blue                SCL

    Green             SDA

    The white is also 5v for the pull up resistors.

    The resistor values are 4.7k btw.

    We have tested the cable that terminates at the sensor and all
    that is OK.

    I put a multimeter on the GND and SDA solder points on the
    sensor itself and got 3.7v…

    I put a multimeter on the GND and SCL solder points on the
    sensor itself and got 0.0v…

    Don’t know if this means anything or could be useful to know!

    Stuck and frustrated now but hey, 3 weeks ago I knew absolutely
    bugger all about any of this and now I do (sort of).

    I'm thinking we could do with the most basic i2c sensor we can
    find as we have nothing to compare.

    Tonight I'm going to d/l a fresh raspbian and start from scratch
    to check that end.

    Feel like if we can't get past the 'i2c-tools' tests we're
    screwed - never mind getting it in and out of Pd.

    Any thoughts/pointers/options from anyone will be really
    appreciated?

    Cheers,

    Julian

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