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]
<http://lists.paparazziuav.org/user/SendEmail.jtp?type=node&node=10182&i=0>>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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