I2C scanner finds devices but not I2C bus (??)

Using Arduino Networking, Protocols, and Devices
1

Ok, so I bought an MPU6050 gyro/accel from sparkfun, and I connected it do my arduino.
But when I run Krodal's code (Arduino Playground - MPU-6050), it keeps giving me 'error=2'.

I found out it had something to do with I2C connection, and after running an I2C scanner (from RandallR: I2C EEPROM AT24C16 - #5 by RandallR - Storage - Arduino Forum), this was the result:

I2C Scanner
Scanning I2C bus from 0 to 127...
00 2      01 2      02 2      03 2      04 2      05 2      06 2      07 2     
08 2      09 2      0A 2      0B 2      0C 2      0D 2      0E 2      0F 2     
10 2      11 2      12 2      13 2      14 2      15 2      16 2      17 2     
18 2      19 2      1A 2      1B 2      1C 2      1D 2      1E 2      1F 2     
20 2      21 2      22 2      23 2      24 2      25 2      26 2      27 2     
28 2      29 2      2A 2      2B 2      2C 2      2D 2      2E 2      2F 2     
30 2      31 2      32 2      33 2      34 2      35 2      36 2      37 2     
38 2      39 2      3A 2      3B 2      3C 2      3D 2      3E 2      3F 2     
40 2      41 2      42 2      43 2      44 2      45 2      46 2      47 2     
48 2      49 2      4A 2      4B 2      4C 2      4D 2      4E 2      4F 2     
50 2      51 2      52 2      53 2      54 2      55 2      56 2      57 2     
58 2      59 2      5A 2      5B 2      5C 2      5D 2      5E 2      5F 2     
60 2      61 2      62 2      63 2      64 2      65 2      66 2      67 2     
68 2      69 2      6A 2      6B 2      6C 2      6D 2      6E 2      6F 2     
70 2      71 2      72 2      73 2      74 2      75 2      76 2      77 2     
78 2      79 2      7A 2      7B 2      7C 2      7D 2      7E 2      7F 2     

-------------------------------
Possible devices:
68 = DS1307

done

It finds DS1307 on bus 68, but it says 68 2, not 68 found!
(as I see everywhere when a was looking for how this test was used.)
So it doesn't find the I2C bus, but it does find the device (?).
What does this mean.

(the board is wired
VDD - 3.3V
GND - GND
SDA - A4
SCL - A5
VIO - VDD)

So do I have I2C communication or do I not?

Please excuse my English, I'm not a native speaker.

2

Your English is more than adequate!

Do you have pull up resistors on the I2C bus ?
e.g 4K7 for the SDA and the SCL lines

What board are you using?

3

I'm using the MPU6050 from Sparkfun (https://www.sparkfun.com/products/11028)
I've read that it doesn't require the pullup resistor, but I'm not sure if that's true.

4

How long are the wires from the Arduino to the device? They should be as short as possible.

5

The wires are about 10cm long, but I've connected the VDD and VIO to th 3.3V via a breadboard to make it easier to connect them together.

6

rammstein1999:
I'm using the MPU6050 from Sparkfun (https://www.sparkfun.com/products/11028)
I've read that it doesn't require the pullup resistor, but I'm not sure if that's true.

using one doesn't harm either ...

See this explanation - Gammon Forum : Electronics : Microprocessors : I2C - Two-Wire Peripheral Interface - for Arduino -

7

do you actually have a ds1307 ?