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BH Land Ranger Pro PP Modification

I decided to modify my Bounty Hunter Land Ranger Pro metal detector today.  It’s a great metal detector but I think everyone with one of these knows that the Pin Point button can be temperamental at times. To overcome this, people generally add a switch of various kinds to replace the function of the button. 

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GY-273 - working

After yesterdays success with the GY-273 chip that has a chip marked DA 5883 on it (and seems to be based on the QMC5883L), I noticed when I plugged it in this morning all axis, X, Y and Z, were all outputting 0. So, time to start from the ground and build up. The datasheet

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Cheap 3-Axis magnetometer GY-273

Purchasers of cheap e-bay 3-axis magnetometers might be as disappointed as I was when trying to run pretty much every example sketch only to find that while they run, they don’t work. The GY-273:   Or is it a HMC5883L?    After much hunting around I found out why.  Most 3-axis magnetometers are – or at least, used