@ GMISoft. This happens t quite a few of us as well. In fact, I had the same issue as well today. By lightly tapping on the sensor with your fingernail, it seems to resolve the problem. See Reply #3 in post https://www.ghielectronics.com/community/forum/topic?id=14289
@ scardinale : it’s scary… This module is supposed to be Embedded on a drone, with vibrations…
Do you think that tapping on it will definitly résolve the problem, I can live with that. But if we had to do that regularily… It’s for me a serious issue with the hardware…
I’ll try tomorrow and give back the results of m’y tests
I’d question whether you’re using the right sensor there. If it’s for interest only, then you’re fine; if you think its fast and accurate enough to help with flight stabilisation, time to look for a new sensor.
@ Brett : I won’t use it for accurate readings, these are clearly not quality built component that I can trust.
But I was expecting more accuracy than that. Difference of 900ft when reading 2 times consecutively, I’m not calling that an “accuracy issue”…
I supposed my barometer component was defect, but I found other peoples having the same problem.
So it sounds it’s a bad component, and I really regret that.
I expected to use it to get an approximate telemetry, and it’s just useless…
I’m not so sure its the module as I have a couple of them and generally they have worked pretty well for me.
Tonight I put together a Raptor network test, but I thought I’d chuck a couple of barometer modules on it for fun and chart the output from those here on the ‘Raptor Network Test’ tab:
but in trying to put 2 barometer modules on a single Raptor board it became very apparent that isn’t possible as the temperature/pressure readings were completely wrong for both modules, so careful about multiple I2C data modules.
I’ll leave my test running for awhile and see if I get any whacked out readings.
@ Duke Nukem: You are probably right, I also have a compass, a gyro and an accelerometer on the Raptor.
Do I need to manage their readings to avoid concurrency ? Do I need to split these components on multiple motherboards ?
Is it a bug in the I2C managementof the motherboard ?
@ Duke Nukem - that pressure stability showing on http://open.sen.se/sensemeters/tab/6395/ is really impressive! It is nice to see that the ripple in temperature is not reflected in pressure.
Have you found any vibration or orientation effects with that sensor. On some pressure sensors I have tried, if you change to orientation the reading will change slightly. This is due to gravity acting on the diaphragm, and may be an issue if used on a moving platform. Vibration will also have an impact.
The sen.se website is also quite impressive.
While I’m sure orientation could have some small effect, project boards in my office don’t have that luxury, as I just grabbed a similar project board that I was done with and wired it up for this test and I left it propped up against my laptop for testing, so I really haven’t noticed anything around orientation or vibration, but perhaps something to specifically investigate later.
The Temperature ripple makes perfect sense here as I’m in Calgary and the outside temperature was like -20 C this morning so the ripples are the furnace kicking on and off and the current decline is the wife trying to freeze me out of my office with the daytime energy saving mode (doesn’t work as I have like number of computers and servers in my office so if I close my door I can get it right toasty in here and the palm trees in my office like that).