ron47
Posts: 12
Joined: Mon May 13, 2013 10:35 am

Can’t see anything on the I2C [solved]

Tue Apr 05, 2016 7:11 am

Hello Forum,

I need your Help.
I want to readout sensors via an I2C-bus. To do this have I inserted a TC74 (A0-5V) and a BMP180 on a test board together. I’m using Debian Wheezy.

lsmod produces the following results:

Code: Select all

Module                  Size  Used by
i2c_dev                 5620  0 
i2c_bcm2708             3759  0 
snd_bcm2835            15846  0 
snd_pcm                77560  1 snd_bcm2835
snd_seq                53329  0 
snd_timer              19998  2 snd_pcm,snd_seq
snd_seq_device          6438  1 snd_seq
snd                    58447  5 snd_bcm2835,snd_timer,snd_pcm,snd_seq,snd_seq_device
snd_page_alloc          5145  1 snd_pcm
leds_gpio               2235  0 
led_class               3562  1 leds_gpio
joydev                  9316  0 
evdev                   9426  3 
i2cdetect -y 1 shows the following:

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     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         
I’m logged in as root!
The modules are supplied with 3, 3V. I have test the circuit even with two 4.7 K ohm pull-up resistors, unfortunately with the same result. Can someone please give me a hind?

Thanks Ron

ron47
Posts: 12
Joined: Mon May 13, 2013 10:35 am

Solved: Can’t see any ting on the I2C

Tue Apr 05, 2016 10:15 am

Sorry, one wire was broken between the RasPi and the test board. After replacement, It's working fine.

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