I just received a Microstack Accelerometer about a week and a half ago. I put the Accelerometer onto the Microstack Baseboard and followed all of the instructions that were provided here.

When I go to run the example in the command line: python3 /usr/share/doc/python3­microstacknode/examples/accelcat.py, it gives this error:

pi@raspberrypi ~ $ python3 /usr/share/doc/python3-microstacknode/examples/accelcat.py  Traceback (most recent call last): 
  File "/usr/share/doc/python3-microstacknode/examples/accelcat.py", line 8, in <module> 
  File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 115, in init 
  File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 127, in standby 
    self.ctrl_reg1.value &= 0xff ^ CTRL_REG1_SET_ACTIVE 
  File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 213, in value 
  File "/usr/lib/python3/dist-packages/microstackcommon/i2c.py", line 85, in transaction 
    ioctl(self.fd, I2C_RDWR, ioctl_arg)  IOError: [Errno 5] Input/output error

When I run sudo i2cdetect -y 1 I get a blank table.

Here is my setup:

Why is this not working?

The documentation doesn't really help you if there was an error.

I am a pretty big noob when it comes to Rasbian, so the more dumbed down the answer, the better.

Any help would be nice!

  • If you get a blank table the I2C device is not connected properly. Could you post a photo of your set up and detail the connections you have made between the Pi and the I2C device? – joan Apr 26 '15 at 9:45
  • I can't see that much can go wrong if it's simply a case of plugging a board over the Pi. No chance of getting anything the wrong way round? Until it is visible to i2cdetect there is no point in running other software. – joan Apr 26 '15 at 16:51
  • I have the same problem, a Pi 2 Model B and the Microstack Baseboard and the Acceleratorometer and GPS neither of which work. Like you my i2C table is blank but the drivers are loaded. I have two baseboards and get the same with either so really scratching. Has anyone got this to work?? I have a call in with Element14 but so far they have not got back to me. Thanks, Scott. – user30812 May 13 '15 at 0:12
  • try disabling file_tree in raspi-config -> advanced. That enabled me to see my devices in i2c, but I still haven got them working... – user31070 May 20 '15 at 14:06

I had the same problems. I'd given up when persistence got the better of me and I came across this: https://github.com/microstack-IoT/python3-microstacknode/issues/1

From your photo I'd say you are one of the 'couple' of boards made without the connection between pin 2 and 3 on JP1.

Missing connection.

You need to bridge this connection (I stuck a bent staple in the holes, but soldering may be better)!

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