Go Down

Topic: RSSI value of bluetooth signal using hc-05 and hc-06 with arduino (Read 159 times) previous topic - next topic

ueulucay

Hello,

I have hc-05 as master and hc-06 as slave.

When i try to pair them both, i get RSSI values like this:

FF43
FF03
FFC1
FF34

What does it mean? I need the values in dBM?

I appreciate your helps.

AWOL

Quote
What does it mean?
Looks like signed sixteen bit numbers, to me, printed as unsigned hex.
"Pete, it's a fool (who) looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.
I speak for myself, not Arduino.

mauried

The numbers really dont mean anything, other than a relative value which will go up or down based on the signal strength.
But RSSI is really a useless value for most things, as there are too many variables which can affect it.
You wont get dbm values from any radios that I know of, unless you have a commercial EMI meter.


ueulucay

The numbers really dont mean anything, other than a relative value which will go up or down based on the signal strength.
But RSSI is really a useless value for most things, as there are too many variables which can affect it.
You wont get dbm values from any radios that I know of, unless you have a commercial EMI meter.
I got what you mean but I need RSSI values in dBm, is there anyway to obtain that value? My setup contains HC-05 and HC-06 ? I just need the signal strength in dBm. I am now doing it in AT mode by AT+INQ so i have those values in hexadecimal.


Looks like signed sixteen bit numbers, to me, printed as unsigned hex.
What about converting it into decimal and apply '10log(decimal value)' ? Does this give me dBm ?

mauried

dBm is a measure of power , referanced to 1 mw , where 0 dbm = 1 mw.
RSSI is just a voltage generated by the AGC gain control loop in a receiver, and thats all it is .
It has no meaning other than a relative value that indicates whether the signal strength is going up or down, but it doesnt tell you what the signal strength is .

ueulucay

I need some scale or something to tell me signal strength, anyone can help ?

Go Up