<div dir="ltr"><div><div><div><div>Hey Martin,<br><br></div>Ok, good stuff - progress.<br></div>Will check all connections again (have to be tomorrow now).<br><br></div>Nice one,<br><br></div>Julian<br></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On 11 April 2013 20:25, Martin Peach <span dir="ltr"><<a href="mailto:martin.peach@sympatico.ca" target="_blank">martin.peach@sympatico.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On 2013-04-11 14:24, Julian Brooks wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hey Martin / list,<br>
<br>
Finally got all the stuff and ...<br>
<br>
It’s not working!<br>
<br>
We spent the day soldering cables and connecting stuff up as per the<br>
Omron ‘App Note 01’ spec sheet.<br>
<br>
Started off super-conservative using the I2C level converter (case 3<br>
page 4) <a href="http://www.adafruit.com/products/757#Blog/Flickr" target="_blank">http://www.adafruit.com/<u></u>products/757#Blog/Flickr</a><br>
<br>
We tried resistors on both sides (being super paranoid!) and then we<br>
took the low (Pi) side ones off.<br>
<br>
We then moved on to case 2 page 3 of this same document…<br>
<br>
At each stage we checked with “I2Cdetect –Y 1” and nothing was visible.<br>
<br>
The grid shows no attached devices every time we run it.<br>
<br>
We re-booted at every stage following the various online<br>
tutorials/methods of setting up I2C GPIO on the Pi (checked & double<br>
checked).<br>
<br>
<br>
As you can see we’re using a pi protoplate:<br>
<br>
<a href="https://www.adafruit.com/products/801" target="_blank">https://www.adafruit.com/<u></u>products/801</a><br>
<br>
In the photo I’ve attached the cables are coded as follows:<br>
<br>
Orange GND<br>
<br>
Yellow 5v<br>
<br>
Blue SCL<br>
<br>
Green SDA<br>
<br>
The white is also 5v for the pull up resistors.<br>
<br>
The resistor values are 4.7k btw.<br>
<br>
We have tested the cable that terminates at the sensor and all that is OK.<br>
<br>
I put a multimeter on the GND and SDA solder points on the sensor itself<br>
and got 3.7v…<br>
<br>
I put a multimeter on the GND and SCL solder points on the sensor itself<br>
and got 0.0v…<br>
<br>
</blockquote>
<br></div></div>
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.<span class="HOEnZb"><font color="#888888"><br>
<br>
Martin<br>
<br>
<br>
</font></span></blockquote></div><br></div>