IOError: [Errno 5] Input/output error

[Neocramencer]

Hey,

i want to use your python Version in a script. Currently iam using the C Version of emsystech and this is running fine. So i just used your python script but this is giving me the IO Error: IOError: [Errno 5] Input/output error, even if i run it with sudo.

I also changed the I2C Device Number to 1 because iam using an actual raspberry Version.
What can i do?

Thanks
Marc

[jaques]

Hi Marc,

I've only got a revision 1 Raspberry Pi, so I use I2C device 0. As I understand it, if you have a newer revision 2 Raspberry Pi you need to use I2C device 1.

I get the same error as you when I tried changing mine to device 1. It might be worth double checking with i2cdetect (this must be run as root as well) that device 1 is correct.

On my machine, there's nothing on device 1.

pi@raspberrypi ~/sht21/sht21_python $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

but you can see sht21 on device 0.

pi@raspberrypi ~/sht21/sht21_python $ sudo i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77

Richard.

[Neocramencer]

Hi Richard,

i already checked that and changed your scriptlone to i2C device 1.
The C code from emsystech is running fine so I2C is good. But your python script gave me the IO error.

Best regards
Marc

[poohsen]

same issue here with a 512 MB raspi. emsystech code runs fine but the python code gives me "errno 5"