Bmp180 timeout

[RED-124]

Hello guys (and girls),

I've been working on a little project recently using both an mpu6050 and a bmp180 each on an I2C bus (i know, kind of strange but ultimately both sensors will have redundency, one of each on each bus)

My problem is that on about 150 try, the code worked about 10 times, it apears the program pretty much always stops on the bmp180 initialisation with a "OSError: [Errno 110] ETIMEDOUT"

I thought it might just be the board failing to sinc time with the sensor on the first try, so i made a "try/except:continue" loop on the initialisation of the sensor but even after an hour (about 15 000 loop) it still didn't work...

The circuit is a custom pcb so yes, the connections are consistent and working (i checked) with 4.7k pullup resistors to 3.3V
If you have any ideas on what could be the problem here, i'd be very glad to ear them... I've been stuck on the same problem for a week now and i really don't want to have to reorder new pcb's and different new sensors...

(Btw, i may seem strange that i'm using the mpu6050 library's output as a list but i modified said library to allow it)

Code.txt

[robert-hh]

Which board & port do you use, and which firmware version?

[robert-hh]

Recent firmware, although I2C is stable since long for STM32.

[RED-124]

mhhh, the pullups are 10k, which should work according to the datasheet (between 10k and 2.2k) but i can try changing them for lower value ones...
And sadly my oscilloscope has been borrowed so i'll only have access to it at the end of next week

[robert-hh]

10k is fine as well with a short wire.

[RED-124]

I was getting kinda annoyed by this so i just tied random things and after 30+ try, i can confidently say that the bmp085 library works just fine with the bmp180

[robert-hh]

That sounds good. I tested with both libraries, and both worked for me, even if I naturally prefer the bmp085 lib. I compared both and did not see any substantial difference for the basic I2C communication.

[octaprog7]

Try adding another zero to freq!
BAR = I2C(scl=Pin('Y9'), sda=Pin('Y10'), freq=100_000)