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  • 13:30
    atmadeep closed #95
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  • Jun 11 06:35

    LorenzMeier on master

    Readme - fix devcall link (compare)

  • Jun 11 06:35
    LorenzMeier closed #94
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  • Jun 08 09:54

    LorenzMeier on master

    Clarify FMU Open Design Usage Update entry point Minimum changes to make FMU-cen… and 14 more (compare)

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    LorenzMeier closed #93
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Phillip Kocmoud
@pkocmoud
You designed the sensor :)
Nick Arsov
@nickarsov
I do not have 4525
Lorenz Meier
@LorenzMeier
@pkocmoud I’m happy to declare the Pixracer’s I2C interface broken if that’s what you’re after
And leave it up to you to figure it out
Mark Whitehorn
@kd0aij
what could cause a shift in the differential pressure offset when a battery is connected?
Lorenz Meier
@LorenzMeier
supply voltage
The sensor’s offset varies with supply voltage (and is compensated for)
Mark Whitehorn
@kd0aij
right, it goes from 4.5 to 5.0V when battery is connected. Important to calibrate airspeed with battery connected
Lorenz Meier
@LorenzMeier
i2c_signal_integrity.jpg
i2c_slope.jpg
Nick Arsov
@nickarsov
yes, when USB powered, the VCC_5V_PERIPH is 5V-0.25(Schottky ), while with 5.3V brick, it is 5.3-0.25
Lorenz Meier
@LorenzMeier
@nickarsov @pkocmoud Here are my results - now up to you to figure out what’s wrong here.
A good start would be to have an analog trace with your default GPS in the same time resolution of the SDA line
Mark Whitehorn
@kd0aij
with and without a 2.7K pullup to 5V on SCL (just hand-held) high level increases from 3.36 to 3.84V
diff_pressure.png
Mark Whitehorn
@kd0aij
@LorenzMeier I've been looking at the I2C signals since yesterday, and the waveforms are typical for OC drivers and a passive pullup.
Lorenz Meier
@LorenzMeier
@kd0aij The waveforms I get (look at the longer interval) certainly don’t look normal
This is either a software issue in the I2C driver on Pixracer that we got away on Pixhawk because it has 120 Ohm inline resistors
Or its some sort of signal integrity issue I don’t understand yet
I won’t spend time on this until Phill and Nick have shown what a good trace with their GPS looks like
Phillip Kocmoud
@pkocmoud
blob
Signal levels of a 3DR airspeed sensor connected by a new i2c hub design that Nick and I prototyped.
This is a drop in solution for all of our i2c needs and it resets the wire length for each segment.
Lorenz Meier
@LorenzMeier
nice!
Simon Wilks
@sjwilks
Cool. When can we get it :)
Gus Grubba
@dogmaphobic
@pkocmoud The changes to the ESP01 firmware are in master. Here is the commit: dogmaphobic/mavesp8266#8
Phillip Kocmoud
@pkocmoud
I have never compiled, can you email a bin?
Gus Grubba
@dogmaphobic
Sorry, I was getting ready to leave. I will be back tomorrow:
I will eventually need to automate the builds and a place to put these binaries. QGC would then check to see if there are updates and offer to upload them automatically.
Phillip Kocmoud
@pkocmoud
We need a replacement for the HMC5883/HMC5983. Anyone with a suggestion?
Lorenz Meier
@LorenzMeier
ST parts
They do the silicon for it anyway
Phillip Kocmoud
@pkocmoud
OK, why has the 9250 not been tried?
Lorenz Meier
@LorenzMeier
Because its AK something mag is no good
Not going to sink time in it. It might be “good enough”, but that’s up for someone wanting so minimize cost
Happy to take a PR enabling it
leomatrix
@leomatrix
Now, I study the PCB of Pixracer () and have a question about this Hardware . As the screenshot shown, the distance from pad to GND(Blue pane) Only about 1.5mil, such as I2C_1_SDA/I2C_1_SCL), My Question is this little distance can be manufacture successfully ??
temp_photo 2016-02-18 22.40.55.jpeg
This message was deleted
无标题.png
Phillip Kocmoud
@pkocmoud
The 2nd and 3rd images are of a PixHawk 2?
leomatrix
@leomatrix
The PCB of Pixracer can be manufacture directly without any modification
Phillip Kocmoud
@pkocmoud
Is that a statement or question?
leomatrix
@leomatrix
ssd.png
@pkocmoud the screenshot give the hardware version
Phillip Kocmoud
@pkocmoud
OK, I cannot speak on the PixHawk2, you must ask Philip Rowse.
leomatrix
@leomatrix
Sorry, It is FMUV3 version