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[Paparazzi-devel] HMC5843 magnetometer

From: cristina barrado
Subject: [Paparazzi-devel] HMC5843 magnetometer
Date: Mon, 23 Jan 2012 13:32:47 +0100
User-agent: Thunderbird (X11/20080914)

Dear all,

At the ICARUS group (UPC-Barcelona Tech, Spain) we have been trying to set up a quadrotor for quite a long time. Thanks to Gautier and Michiel we had it almost set, but we still have some problems with the magnetometer.

We use a Booz2 with LPC21 and BoozIMUv-1.1. Since the magnetometer in the IMU was not working we tried to connect an HMC4853 ( board using the I2C_1. The board is set for 5V, thus we connected it to the UART0+I2C_1 (LTranslated) connector.

Values read from magnetometer are still 0,0,0!! Software seems to be fine (some debugging using leds tells us that the I2C device is not responding). Then we looked at the oscilloscope and find out the the SDA lines of the I2C_1 were only 1.6V (while CLK line was fine!). The most surprising thing is that voltage levels are OK (close to 3V and 5V on each I2C_1 connector) when we disconnect the HMC board !!?

Has any of you work with the HMC board at 5V?? Do we need to add new pull up resistors? The Booz2 board already has them...


Cristina Barrado
Barcelona Tech

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