Magnetometer connection without IMU shield

Actually you can connect HMC directly to APM board. I2C manager is on IMU board like Chris said but I2C bus is coming from main CPU. I2C managers are relying on Libraries that we have wrote for APM/IMU shields so if you connect directly to APM or start using APM to your own other needs, you need to write your software.

There are basic softwares for Atmel 328 that communicates with HMC, you can use that as a starting point. Everything else is up to you.

Remember is you connect directly, you need to take care of all pullup resistors, I2C bus initializations and so on..

I2C Bus is on APM board close to GPS port. Look from bottom of APM at end of that 2 row connector there are pin pairs called as PL7(24) / SCL and anohter pair is SDA / PD4.

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Jani Hirvinen February 7, 2011 at 5:39pm

Actually you can connect HMC directly to APM board. I2C manager is on IMU board like Chris said but I2C bus is coming from main CPU. I2C managers are relying on Libraries that we have wrote for APM/IMU shields so if you connect directly to APM or start using APM to your own other needs, you need to write your software.

There are basic softwares for Atmel 328 that communicates with HMC, you can use that as a starting point. Everything else is up to you.

Remember is you connect directly, you need to take care of all pullup resistors, I2C bus initializations and so on..

I2C Bus is on APM board close to GPS port. Look from bottom of APM at end of that 2 row connector there are pin pairs called as PL7(24) / SCL and anohter pair is SDA / PD4.
3D Robotics

Chris Anderson February 7, 2011 at 4:05pm

You can't do it. The mag is a I2C device and the I2C bus manager is on the IMU shield
Zach Bayne February 7, 2011 at 3:22pm

Im pretty sure you can't do this.

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Magnetometer connection without IMU shield

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