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I have linked this chip to my raspberry pi. I used these instructions to do it then installed everything I was told to install using these instructions. For some reason only two of the devices are showing when I run sudo i2cdetect -y 0 as you can see below:

enter image description here

I was wondering if would explain why the third device isn't showing up (which I think is the HMC5883L chip that is not showing up).

EDIT:

Wiring diagram:

enter image description here

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18
  • MPU6050 is 0x68 and BMP180 is 0x77. I'm not sure I understand how you are saying to work out which address HMC5883L is? :) I've also added wiring diagram to post.
    – cross
    May 15, 2015 at 18:01
  • @goldilocks But everything is on one chip so I can't detach individual chips.
    – cross
    May 15, 2015 at 18:06
  • And I linked to the other one that was working was because it had the wiring diagram :) This is the chip ebay.co.uk/itm/…
    – cross
    May 15, 2015 at 18:09
  • You might have a faulty board on your hands - you wouldn't by chance have purchased a second one so you can see if the issue is the same on both?
    – Phil B.
    May 15, 2015 at 18:16
  • Okay, my bad. I skipped over the first link that showed the combo breakout. As Phil says, if two of the chips show up, obviously your wiring is right -- I dunno what else you can do. But someone else might...
    – goldilocks ♦
    May 15, 2015 at 18:19

1 Answer 1

Reset to default
1

I had the same problem. The board is not faulty, the problem is caused by the MPU6050. Add these lines to the MPU6050 initialization process:

self.bus.write_byte_data(self.address, 0x37, 0x02)
self.bus.write_byte_data(self.address, 0x6A, 0x00)

so the whole MPU6050's initialization process is something like this:

self.bus = smbus.SMBus(1) // or 0, depends on the revision of the board
self.address = 0x68

self.bus.write_byte_data(self.address, PWR_MGMT_1, 0x80)
time.sleep(2)

...

self.bus.write_byte_data(self.address, 0x37, 0x02)
self.bus.write_byte_data(self.address, 0x6A, 0x00)

After running this code, type sudo i2cdetect -y 0, and the third device will show up. Hope it helps!

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