Le 2022-07-02 à 16 h 07, Marc Lavallée via People a écrit :

Le 2022-05-10 à 18 h 09, Matt Flax a écrit :

Test whether it is detectable on the i2c bus. You may need to disable 
the overlay in config.txt.

i2cdetect -l

The result is empty.
ls /dev/i2c* is also empty

That will list the available i2c busses. Then you can detect a bus, such 
as bus 1 :

i2cdetect 1

Do you see any indications in the output from i2cdetect that an IC is 
responding on the bus ?

Nope.

I forgot to load the i2c device module:
sudo modprobe i2c-dev

Now I get some result:

$ i2cdetect -l
i2c-1    i2c           bcm2835 (i2c@7e804000)              I2C adapter

$ i2cdetect 1
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-1.
I will probe address range 0x08-0x77.
Continue? [Y/n]
     0 1 2 3 4 5 6 7 8 9 a b c d e f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

The Octo is not detected... :-(
Is it broken?

Marc