SHT20 twi scanner device not found

[Mr.NCK]

Greetings,

    I designed custom board using nRF52832 and sht20 temperature sensor. I defined sda and scl pin number of sht20 in pca board file (pin number 23 and 24). 4.7k pull up is given to sda and scl. When i test with example code TWI scanner it's showing device not found. But when I connect custom board sda and scl with arduino a4 and a5 pin and flashed arduino twi scanner code device address is showing. But it's not workinh with nRF example code.  Please help us regarding. Thanks.


Regards,
SmartX 

[awneil]

nRF52832  is a 3V device - 4.7k may be a bit high for a 3V bus ?

Did you use a 3V Arduino?

What you really need to do is to look at the I2C lines with an oscilloscope (or analyser) - then you can see exactly what's happening.

See: https://www.avrfreaks.net/comment/3074021#comment-3074021

[DD_]

Hi Awneil,

    Yes We used 3.3V in arduino. I found no problem there. I2C line working properly after flashing code I checked voltage levels and in oscilloscope also. But we found same issue. Is there any initialization needed for this particular sensor? Please help us regarding. 



Regards,
SmartX

[awneil]

So what did the scope show you?

Post a trace ...

Compare scope traces for the working and non-working versions.

DD_ said:

Is there any initialization needed for this particular sensor?

Specific requirements of the Sensor will be detailed in its datasheet.

[DD_]

   When we flash TWI scanner code from nRF SDK example voltage 3V3 appearing. But device not  found.  But when I flash I2C scanner code in arduino device address is showing. That's the exact problem we are facing. Sensor is uprunning but not responding to nordic example code. please help us regarding.

[awneil]

Static voltage tells you nothing; you need to look at the activity on the I2C lines - that's what the oscilloscope is for.

Again, what do the oscilloscope traces (Arduino and Nordic) show you? See how they differ.