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

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

awneil — Mon, 08 Mar 2021 12:46:00 GMT

[quote userid="93415" url="~/f/nordic-q-a/72492/error-in-establishing-a-connection-between-nrf52840-dk-board-and-sht21-sensor-using-twi-module/298349#298349"]Hardware is completely working fine[/quote]

How do you know that?

Again:

[quote userid="6462" url="~/f/nordic-q-a/72492/error-in-establishing-a-connection-between-nrf52840-dk-board-and-sht21-sensor-using-twi-module/298337#298337"]Have you used an oscilloscope or logic analyser to see what's happening on the wires[/quote]

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

Ashu@2000 — Mon, 08 Mar 2021 11:57:58 GMT

Hardware is completely working fine

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

Ashu@2000 — Mon, 08 Mar 2021 11:51:21 GMT

So if possible then please do help me.

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

Ashu@2000 — Mon, 08 Mar 2021 11:50:29 GMT

sht21-i2c-temperature-and-humidity-sensor - is the module that I am using.

Regarding software of newly developed code, I can share all possible information on that.

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

awneil — Mon, 08 Mar 2021 11:24:58 GMT

So the device is not giving an ACK.

How are you sure that your hardware is correct and working?

How are you sure that your software configuration is correct?

Which takes us back to the original questions:

[quote userid="6462" url="~/f/nordic-q-a/72492/error-in-establishing-a-connection-between-nrf52840-dk-board-and-sht21-sensor-using-twi-module/298293#298293"]

Do you have correct pullups?

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

[/quote]

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

Ashu@2000 — Mon, 08 Mar 2021 10:59:51 GMT

I am using a Nordic TWI scanner.

The address of the IC is 7 bit that is 1000 000, last bit 1 - Write and 0 - Read.Sensirion_Humidity_Sensors_SHT21_Datasheet

If I try the TWI scanner program, the only thing that gets printed on RTT is:

TWI scanner started.

No device was found.

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

awneil — Mon, 08 Mar 2021 09:39:35 GMT

[quote userid="93415" url="~/f/nordic-q-a/72492/error-in-establishing-a-connection-between-nrf52840-dk-board-and-sht21-sensor-using-twi-module"]I am unable to even scan and get the response from the SHT21 sensor.[/quote]

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?

[quote userid="93415" url="~/f/nordic-q-a/72492/error-in-establishing-a-connection-between-nrf52840-dk-board-and-sht21-sensor-using-twi-module"] I am trying to send a basic address that is 0x80[/quote]

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.

[quote userid="93415" url="~/f/nordic-q-a/72492/error-in-establishing-a-connection-between-nrf52840-dk-board-and-sht21-sensor-using-twi-module"] am unable to get anything on RTT viewer[/quote]

Have you correctly configured the project to use RTT?

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