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 <[email protected]> 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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