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CC2745R10-Q1: Inconsistent CS results between car node and key node

Shreeya J
Prodigy 20 points

Part Number: CC2745R10-Q1
Other Parts Discussed in Thread: SYSCONFIG

Hello Team,

CCS IDE: 20.3.1

SDK: simplelink_lowpower_f3_sdk_9_14_02_15

Car node flashed in: CC2745R10-01 Launchpad  having one antenna (initiator)

Key node flashed in: Custom board CC2745R10 having 2 antennas in PCB(reflector)

 Distance between these two boards is fluctuating drastically, where car node is kept stationary and key node is moved away. The actual diastance is less than 1m, initially the car node shows 10cm after moving keynode and bringing to the previous position, it is showing 71cm. Sometimes distance is decreasing as keynode is moved farther away and shows more distance if the boards are closer. The results suddenly jumps from 30cm to 250cm, when the boards are staionary.

Note: python script is not used for CS here as shown in the original example of the stack. We modified the stack in car node to automatically connect with keynode and initiate CS procedure with default parameters set.

Please guide me through the changes to be done which can improve the results and reach me if any additional information is required.

please find below sysconfig screenshots of carnode and keynode.

image.png

image.png

 

regards,

shreeya

 

  • 0
    TI__Intellectual 1980 points

    Hello Shreeya,

    Since you are using launchpad as your initiator, this would be a 1x2 antenna config, not 2x2. Currently you have configured the car_node sysconfg to have 2 antennas, so please try changing that to 1.

    Also, you mentioned that you aren't using the python script, so how are you outputting distance results? Are you using an embedded example? Thanks.

    Eshaan

  • 0
    Prodigy 20 points

    Ji Eshaan, 

    i have already tried that, results are still fluctuating. I am using functions to call APIs. I have a doubt as i am using external antenna at the initiator side, should CA2 capacitor path need to be replaced? External antenna and booster antenna is different? where will i find booster antenna? If i use only external antenna can the results differ from using booster antenna?

    Thanks,

    Shreeya

  • 0 in reply to Shreeya J
    TI__Intellectual 1980 points

    Hello Shreeya,

    Yes if you are using an external antenna connected to the SMA pin, then CA2 antenna needs to be reoriented to the CA1 pads so that external antenna can be utilized. By booster antenna, are you referring to the one on the launchpad? Can you please send a picture of the logs you are seeing? 

    Thanks