Thank you for your quick reply!
Yes I see my workaround isn't such a good idea.
With other I2C-Sensors (tsl2561 light sensor) I also hadn't any problems
and all worked fine. But with the k30 co2 sensor in particular something
doesn't work.
I also tried to slow down the i2c clock but it didn't help.
The co2 sensor uses the so called clock synchronization mechanism.
Is it what you mean Michael?
This is described as follows in the I2C- Specification:
"On the bit level, a device such as a microcontroller with or
without limited hardware for the I2C-bus, can slow down
the bus clock by extending each clock LOW period. The
speed of any master is thereby adapted to the internal
operating rate of this device."
Equally it is described in the atmel datasheet:
"The slave can extend the SCL low period by
pulling the SCL line low. This is useful if the clock
speed set up by the master is too fast for the
slave, or the slave needs extra time for processing
between the data transmissions"
Because of that I concluded that the Atml128-I2C components support this
mechanism
but now I'm not sure if it works fine.
Have anybody successfully communicated with an i2c sensor
that slows down the master clock with this mechanism?
@michael
Yes I think it is a related problem.
If I don't get it to work with the standard tinyos components I think
bit banging will be the next step.
Are there any sources? Can you give a hint?
Best regards
Sebastian
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