I found this, but can not understand clear!
http://lists.paparazziuav.org/Re-HMC5843-magnetometer-Hector-Garcia-de-Marina-td10180.html#a10182
On Tue, Jan 24, 2012 at 12:59 PM, Prof.
Dr.-Ing. Heinrich Warmers <[hidden
email]>
wrote:
Hi
we had also same problems with the HMC5843 on Sparkefun
modules.
On one we double the capacitance of 5µF to 10uF.
Then the module were running.
The new one with the HMC5883L runs without problems.
It seems that there is a error on the old chip.
To use the chips with 5V I2c you can use 2 Fets or a level
translator
ic.
Voltages over 3.3V on the I2c lines can destroy the chip!
On Mikrokopter there use a 200 Ohm series resistors on the i2c line.
We destroy the LPC2148 chip as we use the mikrokontroller
motor
controllers (5V I2c)
and
had situations that the LPC power was down and the motor
controllers
not.
Also you will destroy the electronic if the ground wire is
broken.
Is it possible that the mkk switched to 5V level on
I2C, when powered from 4S and that killed the LPC 3.3V line? How can
it happen?! My ground was connected inside the battery, therefore
was only the SDA and SCL connected.
Sergey. We have to forget the PWM because it is slow, therefore I
just now familiarize with I2C, because it quick. But then what to
use?
SilaS
2014-02-11 22:29 keltezéssel, Sergey
Krukowski írta:
Hi!
If there is no connection to esc's anymore - it's a sign of
probable damage. Can't really say however what was the particular
reason for it. My only explanation could be the wrong balancer
connection for powering the board.
What you still can try is to connect an i2c level converter to
check if it helps. But I wouldn't really recommend trying to work
with mk esc's and probably damaged bus. Imho I2C bus is generally
a bad and unreliable solution for controlling such kind of
devices, especially in case of probable bus damage.
Best Regards,
Sergey
Hi David,
I am again in trouble. I want to replace my powering from 3S to
4S because my neutral-hower-throttle was around 80% of throttle.
For to do it: I removed the power from main power distribution
board and made a connector for balancer port of the same battery
as feed the power board. On balancer I connected only the first
3 cell and therefore I hope that can watch the consumption while
i got my atto sensor.
I powered first the AP over balancer and a few minutes later the
main connectors. The AP started perfect, the I2C ESC-s - what I
got also from You - started as regular, but at the end all show
red LED on, so indocate no signal on I2C0 bus!!!!
So I can not start the motors!!!!
A few minutes later I made everything back to 3S config. But the
problem is the same! What can happen? How can I check the I2C
communiction of AP?
SilaS
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