Trill Craft not detected on Arduino

cdestephen

Hi Everyone,

I was trying to run a Trill Craft with my Arduino MKR Zero.
I made sure to connect Ground, 3.3V, SDA and SCL lines.
I tried to run craft.print.ino and detect-all-devices.ino but I get this message :

failed to initialise trillSensor
Error code: 2

I double checked connections, there is indeed 3.3V arriving at the +V/Gnd pins and I could watch something happening on the SDA/SCL lines form my scope.

Any idea ?

Thanks in advance,

giuliomoro

Hi,
do you know if pull up resistors are present on the SCL and SDA lines of your Arduino? The schematics show that resistors R22 and R23 are marked as "DNP" (do not place). Could you check if they are installed on your PCB? If they are not, this could cause malfunctioning of the I2C bus and you will need to install some 2k2 (or 4k7, the exact value is not critical) resistors between SCL and 3v3 and between SDA and 3v3. You could either install them on the Arduino itself (if you are good at SMD soldering), or anywhere else between the Trill and the Arduino. For instance, if you are going through a breadboard, you could put them on the breadboard.

cdestephen

Hi Giuliomoro,
Indeed the pullups are not part of the MKRZero Schematics. I dont know about the board, because I wouldn't know where to look (I also cannot orientate myself through the pcb eagle file)
I dont know if this is enough of a test but I can see both lines being pulled up from 3.3V.
For the sake of it I did add a 4k7 on each line (through a breadboard), but the problem is still here...

giuliomoro

The fact that you could see some activity on the lines hints that it's not a software problem (e.g.: if the wrong I2C bus was being addressed). Do you happen to have another board with I2C that you could test the Trill with? Just to confirm, could you sketch the connections you have at the moment?

cdestephen

Problem found : my two jumper cables for gnd/+V were simply defective....
I managed to run the first sketches already.
Thanks for your quick answers !

giuliomoro

great news!