How can I convert dbm to signal strangth bars to display in home assistant.
The logs show the bars (see image) but it gets reported as a -ve dbm value and I would like to show this as a percentage or number of bars in HA ?
And what is the formulae to convert from dbm to bars
I wouldn’t bother with a formula.
If you want to match dBm to say a 4 bar chart - use these values for example:
sensor:
- platform: wifi_signal
name: "WiFi Signal Sensor"
id: wifi_signal
update_interval: 60s
- platform: template
name: "WiFi Number of Bars"
lambda: |-
if (id(wifi_signal).state >= -30) {
return 4;
} else if (id(wifi_signal).state < -30 && id(wifi_signal).state >= -67) {
return 3;
} else if (id(wifi_signal).state < -67 && id(wifi_signal).state >= -70) {
return 2;
} else if (id(wifi_signal).state < -70 && id(wifi_signal).state >= -80) {
return 1;
} else {
return 0;
}
update_interval: 60s
Apologies for any syntax errors - untested but you get the drift. The example values I used are from Wi-Fi Signal Strength Basics | MetaGeek but feel free to Google for your own values.
Thanks so much for helping, for some reason I was unable to return a string / integer, this is what works for me:
sensor:
- platform: wifi_signal
id: wifi_sig
name: Signal
update_interval: 60s
text_sensor:
- platform: template
name: "Wifi Bars"
entity_category: diagnostic
lambda: |-
if (id(wifi_sig).state >= -30) {
return (std::string) "4";
} else if (id(wifi_sig).state < -30 && id(wifi_sig).state >= -67) {
return (std::string) "3";
} else if (id(wifi_sig).state < -67 && id(wifi_sig).state >= -70) {
return (std::string) "2";
} else if (id(wifi_sig).state < -70 && id(wifi_sig).state >= -80) {
return (std::string) "1";
} else {
return (std::string) "0";
}
update_interval: 60s
Ah - that’s probably my bad… should have used a Template Number sensor. Not sure why my brain said Template Text.
If all you doing is a comparison for how many bars to display it shouldn’t matter.