Float over ble_nus

[Nordic DevZone]

Hi,

I'm trying to send a saadc float value over ble (dk to dongle) with ble_nus. I'm getting the right values but also some other stuff in addition. How can I filter this?

  

[Jørgen Holmefjord]

Hi,

Your sizeof(data) function will return the size of the array regardless of the length of the string. You can use strlen() or the return value from sprintf() to assign the length of the actual string to d_len.

Best regards,
Jørgen

[Juniorprogrammer]

Hi Jorgen,

Thanks that worked!

Small question maybe you know the answer.

I´m reading my SAADC now nothing is put on and send it over ble. It should be equal to something as zero. When I have a COM-port open on PuTTY for the receiving part I receive +1 values, but after I open also the COM-port for the DK, which I send with, the val go to zero. Is this because nothing is connected on de AIN yet?

[Jørgen Holmefjord]

Hi,

When nothing is connected to the AIN pin, the pin is floating, it is not connected to GND. It will then be affected by noise and other signals close to the pin, so you will read any arbitrary value from the pin, not zero.

Best regards,
Jørgen

[Juniorprogrammer]

Hi,

Thanks I know enough!

Have a nice day!

Kind regards,

JP