|From:||Prof. Dr.-Ing. Heinrich Warmers|
|Subject:||Re: [Paparazzi-devel] HMC5843 magnetometer (Hector Garcia de Marina)|
|Date:||Tue, 24 Jan 2012 12:59:37 +0100|
|User-agent:||Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)|
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.
cristina barrado schrieb:
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