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wifi strenght WiFi.RSSI

Q&A Forum › Category: ESP32 › wifi strenght WiFi.RSSI
0 Vote Up Vote Down
Jean Pierre Daviau asked 6 months ago

Hi,
 
When asking for the wifi RSSI.  the Node32s board being at  30 meters from the router,  I get a result of -79.
 
Is that stronger than -45?
 
Is it the wifi reading from (by)  the card?
 
 
Regards
 
JPD
 

Question Tags: RSSI, wifi
3 Answers
1 Vote Up Vote Down
Steph answered 6 months ago

RSSI, or “Received Signal Strength Indicator”, is a measurement of how well your device can hear a signal from an access point or router.

WiFi signal strength is represented either as quality in percentage, or an RSSI value in dBm. RSSI is usually expressed in decibels relative to a milliwat (dBm) from zero to -120 dBm. The closer it is to zero, the stronger the signal is.

RSSI level less than -80 dBm may not be usable, depending on noise. In general, the following correlation can be applied:

  • RSSI ≥ -50 dBm => quality = 100%
  • RSSI ≤ -100 dBm => quality = 0%
  • -100 dBm ≤ RSSI ≤ -50 dBm => quality ~= 2 x (RSSI + 100)

For example:

  • RSSI = -79 dBm => quality ~= 42%
  • RSSI = -45 dBm => quality = 100%
0 Vote Up Vote Down
Jean Pierre Daviau answered 6 months ago

Clear enough ! :0))))
 
 
Thks

1 Vote Up Vote Down
Sara Santos Staff answered 6 months ago

Thanks Stéphane for your great explanation. 😀
I’ll mark this issue as resolved.
Regards,
Sara

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