Missing gain setting (0.88 G) about adafruit_hmc5883_unified

[ladyada]

this sensor is discontinued many years ago so we can't test or verify anything about it - we dont own one anymore!

[groundstate]

OK, but versions of the board are still available and it's still useful because it has lower noise than eg the LIS3MDL.

For anyone reading this who wants to use the 0.88G mode, just add
HMC5883_MAGGAIN_0_9 = 0x00, // +/- 0.88
to the magnetometer gain settings in the .h and
case HMC5883_MAGGAIN_0_9:
_hmc5883_Gauss_LSB_XY = 1370;
_hmc5883_Gauss_LSB_Z = 1370;
break;
to Adafruit_HMC5883_Unified::setMagGain() in the .cpp
I have used conversions from the datasheet but maybe you want to scale the Z conversion (decrease by 12%) like the others in the switch(gain)

[ladyada]

yah current breakouts are not real hmc's, they're knockoffs - you could submit a PR and we may do a sweep at some point to merge in!