The "begin" function always returns TRUE about adafruit_hmc5883_unified

[oliver30982]

Hi,

I had the same problem and solved it by putting

if (read8(HMC5883_ADDRESS_MAG, HMC5883_REGISTER_MAG_MR_REG_M) == 0xFF) return false;

directly after Wire.begin();

Oliver

[budryerson]

Thanks, Oliver. Adafruit should add that correction to their library.

I cobbled together my own library from bits and pieces of this and the Honeywell version. In my setup, I request the ID from the device and fail if I get other than "H43".

But these days, everyone uses an IMU of some kind with the mag compass built in. I don't think anyone but a masochist would use this device anymore.

[zs6buj]

Thanks Guys, but alas oliver30982's patch didn't immediately work for me on v1.8.5. Eventually I determined that, in my environment

(read8(HMC5883_ADDRESS_MAG, HMC5883_REGISTER_MAG_MR_REG_M)

returns 3 when the HMC5883 is present, and 0 when it is not.

In all fairness, my "HMC5883" might not be the real McCoy, as it came off an old CX-20 Quad. The chip is, however, marked L883.

I hope this is useful to someone.