[PD] Sensors GPIO Raspberry Pi Pd

[Julian Brooks]

Hi Martin,

Did you manage to make any progress with the sensor on the Pi?
I also wanted to ask whether the output we're receiving from i2cdump makes
any sense to you as it doesn't to us currently?  Tried searching around for
possible info on the 'XX' & 'ff' but drawing a blank here.

Cheers,

Julian


On 13 April 2013 01:11, Julian Brooks <jbeezez at gmail.com> wrote:

> 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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