How to Open I2C Bus

[Patrick]

Hi again. I have a few problems:

1) Unlike the other codes, why do I always have to CD into the library when running these executables:
a) pi@raspberry~$ sudo./gyro_accelerometer_tutorial02
b) pi@raspberry~$ sudo./compass_tutorial03

Only these two tutorials don’t execute without having to CD.. while others work perfectly fine even if i type the executable straight after “pi@raspberrypi~$”

2) Calibration Questions

a) Step 3 says “Stop the program with ‘Ctrl-C’ and you will see some definitions printed out in blue text which needs to be added to your compass program. E.g. compass_tutorial03.c in the above Git repository”

–> I was able to get the definitions in blue text (pls see image). What do I do next? By “adding the values to compass program” means I have to replace the values below to the ones I got? Or do i simply just type the values i got under it? Pls help me understand.

`#define magXmax 1210
#define magYmax 1245
#define magZmax 1178
#define magXmin -1335
#define magYmin -1142
#define magZmin -1303

b) Could you pls check if my “rawdatauncalibrated.txt” file has the right contents? (see image)

c) The first two steps of plotting…

Do i type it like this:
pi@raspberrypi ~ $ sudo ./compass_tutorial01 > rawdatauncalibrated.txt
pi@raspberrypi ~ $ awk ‘NR>2{ print l} {l=$0}’ calnewtemp.txt > ~/uncalibrated.txt

Or like this:
pi@raspberrypi ~ $ sudo ./compass_tutorial01 > rawdatauncalibrated.txt
awk ‘NR>2{ print l} {l=$0}’ calnewtemp.txt > ~/uncalibrated.txt

3) How can I rotate the compass display by 90 degrees … i’m using an led tv so it’s displaying in landscape orientation, how can i make it portrait.

Thanks a lot.

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[Mark Williams]

2 A) The values already in the code are the calibration data for my BerryIMU. You replace these values with the data from your calibration results.
2 B) I checked both images and that data looks good in both.
2 C)Use the first example.
Run the code with the command below for a few minutes. While it is running rotate the BerryIMU in all directions to try and gather as much information as you can.
pi@raspberrypi ~ $ sudo ./compass_tutorial01 > rawdatauncalibrated.txt

You then need to remove the first and last line before plotting it with Mathematica, you can do this manually or you can use this command;
awk ‘NR>2{ print l} {l=$0}’ calnewtemp.txt > ~/uncalibrated.txt

Mark --OzzMaker.com --

[ilyas]

I purchased BerryGPS-IMU a few weeks ago. I have no problem using GPS. But when i try to use IMU i2c addresses not detected. I attached the screen shoot.

I made the settings as indicated on the link below. But I did not succeed.

How to Enable i2c on the Raspberry Pi

Could you please help me.

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[PeterP]

Can you please show me the output of these commands;

ls -l /dev/ic*
lsmod | grep i2c
grep i2c  /boot/config.txt

Peter --OzzMaker.com --

[ilyas]

pi@raspberrypi:~ $ ls -l /dev/ic*
ls: cannot access ‘/dev/ic*’: No such file or directory

pi@raspberrypi:~ $ lsmod | grep i2c
i2c_bcm2835 16384 0
i2c_bcm2708 16384 0
i2c_dev 16384 0

pi@raspberrypi:~ $ grep i2c /boot/config.txt
# dtparam=i2c_arm=on
# dtparam=i2c1=on
dtparam=i2c_arm=on
dtparam=i2c1=on

thanks for your help.

 

[PeterP]

i2c isn’t actually enabled..
I see that you have the new Pi 3+… maybe our instructions don’t work with that model Pi.. I will need to test.

Trying enable i2c using sudo raspi-config. It is under interface options

Peter --OzzMaker.com --

[ilyas]

I did it, but the result is the same.

[PeterP]

I double checked the commands above and I made a typo. Please show me the output of;

pi@raspberrypi:~ $ ls -l /dev/i2*

You should see this;

pi@raspberrypi:~ $ ls -l /dev/i2*
crw-rw---- 1 root i2c 89, 1 Jun 15 10:17 /dev/i2c-1
pi@raspberrypi:~ $

If you do, then your IMU isn’t working. and you need to contact sales< at > ozzmaker.com

Peter --OzzMaker.com --

[Author]

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