Error in establishing a connection between nRF52840 DK board and SHT21 sensor using TWI module.

[Ashu@2000]

I  am using the SHT21 sensor for measuring temperature and humidity, trying to connect it to nRF52840 DK Board using TWI mode.

I am unable to even scan and get the response from the SHT21 sensor.

Initially, I am trying to send a basic address that is 0x80 and just confirming whether the communication is getting established between SHT21 and nRF52840 DK board or not.

I am unable to get anything on RTT viewer.

[awneil]

Ashu@2000 said:

I am unable to even scan and get the response from the SHT21 sensor.

Did you use the Nordic TWI scanner for that?

Do you have correct pullups?

Have you used an oscilloscope or logic analyser to see what's happening on the wires?

Ashu@2000 said:

I am trying to send a basic address that is 0x80

I2C addresses are 7-bits - so cannot possibly be 0x80.

0x80 could be the address plus the R/W bit - are you sure you have that correct?

See: www.avrfreaks.net/.../1872781

Again, the easiest way is to use the Nordic TWI Scanner example.

Ashu@2000 said:

am unable to get anything on RTT viewer

Have you correctly configured the project to use RTT?

Some examples default to using UART for the LOG outputs ...