[PD] Sensors GPIO Raspberry Pi Pd

[Julian Brooks]

Hey Martin,

Ok, good stuff - progress.
Will check all connections again (have to be tomorrow now).

Nice one,

Julian


On 11 April 2013 20:25, Martin Peach <martin.peach at sympatico.ca> wrote:

> On 2013-04-11 14:24, Julian Brooks wrote:
>
>> 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<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<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…
>>
>>
> If you have pullup resistors you should get the same 3.7V on SCL (with it
> switched on and not running any code), so probably your pin isn't connected
> somewhere.
>
> Martin
>
>
>
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