trouble communicating with T6703 sensor using I2C

[wallage]

I am trying to measure the CO2 level within a room using my Rpy 3 and a T6703 sensor.
The Rpy is running "windows 10 core IOT". I have written a simple program to initiate the communication with the sensor on the I2C bus.
The Rpy and sensor are connected using a level shifter pcb specifically for the I2C interface.
the levels in the blue graph are roughly 0.15V and 4.96V. the brown graph is the digital representation.
I also have a honeywell temperature and humidity sensor connected and that is working fine.

I keep getting the exception "Slave address was not acknowledged." and communication is failing.

i have the c# code attached.

i also attached a file with the waveform on the pins of the sensor. The levels and command look OK.

T6703 I2C.jpg (40.72 KiB) Viewed 618 times

Anyone has a solution how to solve this problem?

[DougieLawson]

Does it work if you use plain Raspbian rather than the less than well supported Windows 10 IoT?

Try posting your question on https://social.msdn.microsoft.com/Forum ... WindowsIoT

[wallage]

I have not as much experience in writing gui apps in c and c++. Therefor c# is much more convinient. Also I can perfectly communicate with the honeywell sensor.

[wallage]

thanks for the effort to help.
I found another datasheet on the web which specified the correct method to put the device in I2C mode.
Now it is working great.