DS18B20 working on esp32cam but not on esp32WROOM

ESPHome
1

Hey there,

Had a DS18B20 working for months on ESP32WROOM. Did many test / changes last week but finally choose to put back the DS18B20 back on my ESP32WROOM.

As I said, it was working fine for months. I put back the exactly same DS18B20 on the exactly same ESP32WROOM on the same GPIO27, but the logs tells me “Found no sensors!” when in DEBUG mode.

What I tried :

  • Changing resistor (4.7, 2.2, many others) => Not working on esp32WROOM, working on an ESP32CAM
  • Without resistor => Not working on esp32WROOM, working on an ESP32CAM
  • Another DS18B20 => Not working on esp32WROOM, both working on an ESP32CAM
  • Connecting a physical switch (like this one) and trigger it => Working on esp32WROOM and ESP32CAM
  • Many different USB charger and USB cables
  • Other GPIOs of course

My yaml :

esphome:
  name: "esptemp"

esp32:
  board: esp32dev
  framework:
    type: arduino

logger:
  level: DEBUG

api:
  encryption:
    key: "something"

ota:
  password: "something"

wifi:
  networks:
  - ssid: !secret wifi_ssid
    password: !secret wifi_password

  ap:
    ssid: "Esptemp Fallback Hotspot"
    password: "something"

captive_portal:

dallas:
  - pin: GPIO27 # Tried GPIO27 too

sensor: # Tried with and without this part, caught the address on my old yaml when it was working, don't know if the address can change or if it always the same ?
  - platform: dallas
    address: 0x6eefa85b1f64ff28
    name: "Temp"

Strange isn’t it ? :sweat_smile: It looks like the DS18B20 sensor ONLY isn’t working anymore on ESP32WROOM.

I made the latest firmware update (ESPHOME 2023.10.6), could it be related ?

Thanks for your help :slight_smile:

2

Hey again,

Just tried with another esp32WROOM this morning, same problem. Could it be a firmware issue ?

Ty !

3

Did you figure this out? I think I have a similar issue. I checked the values from my two DS18B20 sensors today, and one is 25.0 degrees, the other 85 degrees. I have not checked them for months, so I do not know when the issue started.

EDIT: Just going to say here that my issue appears to have been something hardware related with the ESP32. I swapped in a new esp32, everything else the same, added it to HA, and it is good. Before this, I removed the old esp32 from HA, and re-added it using ESPHome, and then put in the sensors in the yaml, but no help there,

4

For last year using following external component for DS18B20 (with external pullup).
It working on various ESP8266 and ESP32, incl. WROOM-32 boards.

external_components:
  - source: github://nrandell/dallasng