[PD] Sensors GPIO Raspberry Pi Pd

[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 at gmail.com> wrote:

> Message resent for thread archives with smaller picture size.
>
> Julian
>
> ---------- Forwarded message ----------
> From: Julian Brooks <jbeezez at gmail.com>
> Date: 11 April 2013 19:24
> Subject: Re: [PD] Sensors GPIO Raspberry Pi Pd
> To: Martin Peach <martin.peach at sympatico.ca>
> Cc: PD List <pd-list at 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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