Dallas temperature sensor turning frequently unknown

ESPHome
1

My Dallas temperature sensors send new values every minute via ESPhome. No issues observable in the ESPhome log. However, since Dec 15 shortly after 8 pm (see graph below) after months of uninterrupted temperature data sending and HA automation scripts reading their states, all my Dallas sensors turn “unknown” when their states are check by automation scripts:

image
image2265×442 21.8 KB

Any idea where this is coming from and how I can fix it? I don’t think I changed anything in my system around the time the Dallas sensors started turning “unknown”.

Home Assistant 2022.12.7
Supervisor 2022.11.2
Operating System 9.4
Frontend 20221213.1 - latest
ESPHome 2022.12.1

2

You are lucky if it works at all:

You can fiddle with the resistor values - that may improve the situation.

3

Good to know it’s not only me … thanks!

4

I have the similar issue. The ESPHome is sending the data of the sensor, but the sensor does not appear in HA. In logs I can see the sensor (it is the second one which is missing). I have 2 dallas sensors (first one which is shown is probably fake and the second one is original), both seemed to be working OK, but in HA only one is shown. Connected by 3 wires.

"sensor": [
{
"object_id": "teplota_topeni",
"key": 3462380664,
"name": "Teplota topeni",
"unique_id": "dallas-4b3cfff09554f428",
"disabled_by_default": false,
"icon": "",
"entity_category": 0,
"device_class": "temperature",
"unit_of_measurement": "\u00b0C",
"accuracy_decimals": 2,
"force_update": false,
"state_class": 1,
"last_reset_type": 0
},
...
{
"object_id": "teplota_myti",
"key": 180005398,
"name": "Teplota myti",
"unique_id": "dallas-1100000f10413828",
"disabled_by_default": false,
"icon": "",
"entity_category": 0,
"device_class": "temperature",
"unit_of_measurement": "\u00b0C",
"accuracy_decimals": 2,
"force_update": false,
"state_class": 1,
"last_reset_type": 0
}

2023-05-29 16_03_24-Window
2023-05-29 16_03_24-Window1229×342 11.8 KB

[16:12:43][D][dallas.sensor:143]: ‘Teplota topeni’: Got Temperature=25.1°C
[16:12:43][D][sensor:109]: ‘Teplota topeni’: Sending state 25.06250 °C with 2 decimals of accuracy
[16:12:43][D][dallas.sensor:143]: ‘Teplota myti’: Got Temperature=79.2°C
[16:12:43][D][sensor:109]: ‘Teplota myti’: Sending state 79.18750 °C with 2 decimals of accuracy
[16:13:22][D][sensor:109]: ‘Teplota technicka mistnost’: Sending state 25.09000 °C with 2 decimals of accuracy
[16:13:22][D][sensor:109]: ‘Tlak technicka mistnost’: Sending state 992.80249 hPa with 2 decimals of accuracy
[16:13:22][D][sensor:109]: ‘Vlhkost technicka mistnost’: Sending state 36.64746 % with 1 decimals of accuracy