ESP32 - dallas_temp and bme280_i2c can't work together

ESPHome
1

I want to have 2x DS18B20 (the waterproof version) and one BME280 (via i2c) sensors connected.

When I have only the DS18B20 connected they work fine. They are recognized and they report temperature as expected.
But whenever I add config section for i2c and bme280, the one_wire starts complaining “Found no devices!”.

The config sections which I have added for BME280 are:

  • i2c
  • platform: bme280_i2c

Does i2c uses some IO pins causing dallas_temp/one_wire to stop working? How can I avoid it? I tried to use one_wire pin GPIO04 as well as GPIO18 and it behaves the same. As long as I add i2c, the dallas sensor is not found and reports 0C.

esphome:
  name: esp32-pool-temp
  friendly_name: esp32-pool-temp

esp32:
  board: esp32dev
  framework:
    type: arduino

one_wire:
  - platform: gpio
    pin: GPIO04

i2c:
  sda: GPIO21
  scl: GPIO22

sensor:
  - platform: dallas_temp
    address: 0x39f3be771f64ff28
    name: "Temp pool surface"
    unit_of_measurement: °C
    icon: "mdi:thermometer"
    accuracy_decimals: 1
    update_interval: 60s
  - platform: dallas_temp
    address: 0x1701707e1f64ff28
    name: "Temp pool depth"
    unit_of_measurement: °C
    icon: "mdi:thermometer"
    accuracy_decimals: 1
    update_interval: 60s
  - platform: bme280_i2c
    temperature:
      name: "BME280 Temperature"
    pressure:
      name: "BME280 Pressure"
    humidity:
      name: "BME280 Humidity"

# Enable logging
logger:
  level: VERY_VERBOSE
  
# Enable Home Assistant API
api:
  encryption:
    key: "..."

ota:
  - platform: esphome
    password: "..."

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esp32-Bazen-Teplota"
    password: "..."

captive_portal:

The log says:

[14:41:55][I][app:100]: ESPHome version 2024.10.0 compiled on Oct 17 2024, 14:38:49
[14:41:55][C][wifi:600]: WiFi:
[14:41:55][C][wifi:428]:   Local MAC: CC:DB:A7:31:97:88
[14:41:55][C][wifi:433]:   SSID: [redacted]
[14:41:55][C][wifi:436]:   IP Address: 192.168.1.188
[14:41:55][C][wifi:440]:   BSSID: [redacted]
[14:41:55][C][wifi:441]:   Hostname: 'esp32-pool-temp'
[14:41:55][C][wifi:443]:   Signal strength: -63 dB ▂▄▆█
[14:41:55][V][wifi:445]:   Priority: 0.0
[14:41:55][C][wifi:447]:   Channel: 11
[14:41:55][C][wifi:448]:   Subnet: 255.255.255.0
[14:41:55][C][wifi:449]:   Gateway: 192.168.1.1
[14:41:55][C][wifi:450]:   DNS1: 192.168.1.1
[14:41:55][C][wifi:451]:   DNS2: 81.90.240.1
[14:41:55][C][logger:185]: Logger:
[14:41:55][C][logger:186]:   Level: VERY_VERBOSE
[14:41:55][C][logger:188]:   Log Baud Rate: 115200
[14:41:55][C][logger:189]:   Hardware UART: UART0
[14:41:55][C][i2c.arduino:071]: I2C Bus:
[14:41:55][C][i2c.arduino:072]:   SDA Pin: GPIO21
[14:41:55][C][i2c.arduino:073]:   SCL Pin: GPIO22
[14:41:55][C][i2c.arduino:074]:   Frequency: 50000 Hz
[14:41:55][C][i2c.arduino:086]:   Recovery: bus successfully recovered
[14:41:55][I][i2c.arduino:096]: Results from i2c bus scan:
[14:41:55][I][i2c.arduino:102]: Found i2c device at address 0x77
[14:41:55][C][gpio.one_wire:020]: GPIO 1-wire bus:
[14:41:55][C][gpio.one_wire:021]:   Pin: GPIO4
[14:41:55][W][gpio.one_wire:078]:   Found no devices!
[14:41:55][C][dallas.temp.sensor:029]: Dallas Temperature Sensor:
[14:41:55][C][dallas.temp.sensor:034]:   Address: 0x39f3be771f64ff28 (DS18B20)
[14:41:55][C][dallas.temp.sensor:035]:   Resolution: 12 bits
[14:41:55][C][dallas.temp.sensor:036]:   Update Interval: 60.0s
[14:41:55][C][dallas.temp.sensor:029]: Dallas Temperature Sensor:
[14:41:55][C][dallas.temp.sensor:034]:   Address: 0x1701707e1f64ff28 (DS18B20)
[14:41:55][C][dallas.temp.sensor:035]:   Resolution: 12 bits
[14:41:55][C][dallas.temp.sensor:036]:   Update Interval: 60.0s
[14:41:55][C][bme280_i2c.sensor:025]:   Address: 0x77
[14:41:55][C][bme280.sensor:182]: BME280:
[14:41:55][C][bme280.sensor:194]:   IIR Filter: OFF
[14:41:55][C][bme280.sensor:195]:   Update Interval: 60.0s
[14:41:55][C][bme280.sensor:197]:   Temperature 'BME280 Temperature'
[14:41:55][C][bme280.sensor:197]:     Device Class: 'temperature'
[14:41:55][C][bme280.sensor:197]:     State Class: 'measurement'
[14:41:55][C][bme280.sensor:197]:     Unit of Measurement: '°C'
[14:41:55][C][bme280.sensor:197]:     Accuracy Decimals: 1
[14:41:55][C][bme280.sensor:198]:     Oversampling: 16x
[14:41:55][C][bme280.sensor:199]:   Pressure 'BME280 Pressure'
[14:41:55][C][bme280.sensor:199]:     Device Class: 'pressure'
[14:41:55][C][bme280.sensor:199]:     State Class: 'measurement'
[14:41:55][C][bme280.sensor:199]:     Unit of Measurement: 'hPa'
[14:41:55][C][bme280.sensor:199]:     Accuracy Decimals: 1
[14:41:55][C][bme280.sensor:200]:     Oversampling: 16x
[14:41:55][C][bme280.sensor:201]:   Humidity 'BME280 Humidity'
[14:41:55][C][bme280.sensor:201]:     Device Class: 'humidity'
[14:41:55][C][bme280.sensor:201]:     State Class: 'measurement'
[14:41:55][C][bme280.sensor:201]:     Unit of Measurement: '%'
[14:41:55][C][bme280.sensor:201]:     Accuracy Decimals: 1
[14:41:55][C][bme280.sensor:202]:     Oversampling: 16x
[14:41:55][C][captive_portal:089]: Captive Portal:
[14:41:55][C][mdns:116]: mDNS:
[14:41:55][C][mdns:117]:   Hostname: esp32-bazen-teplota
[14:41:55][V][mdns:118]:   Services:
[14:41:55][V][mdns:120]:   - _esphomelib, _tcp, 6053
[14:41:55][V][mdns:122]:     TXT: friendly_name = esp32-pool-temp
[14:41:55][V][mdns:122]:     TXT: version = 2024.10.0
[14:41:55][V][mdns:122]:     TXT: mac = ccdba7319788
[14:41:55][V][mdns:122]:     TXT: platform = ESP32
[14:41:55][V][mdns:122]:     TXT: board = esp32dev
[14:41:55][V][mdns:122]:     TXT: network = wifi
[14:41:55][V][mdns:122]:     TXT: api_encryption = Noise_NNpsk0_25519_ChaChaPoly_SHA256
[14:41:55][C][esphome.ota:073]: Over-The-Air updates:
[14:41:55][C][esphome.ota:074]:   Address: esp32-pool-temp.local:3232
[14:41:55][C][esphome.ota:075]:   Version: 2
[14:41:55][C][esphome.ota:078]:   Password configured
[14:41:55][C][safe_mode:018]: Safe Mode:
[14:41:55][C][safe_mode:020]:   Boot considered successful after 60 seconds
[14:41:55][C][safe_mode:021]:   Invoke after 10 boot attempts
[14:41:55][C][safe_mode:023]:   Remain in safe mode for 300 seconds
[14:41:55][C][api:140]: API Server:
[14:41:55][C][api:141]:   Address: esp32-pool-temp.local:6053
[14:41:55][C][api:143]:   Using noise encryption: YES
[14:42:16][VV][scheduler:226]: Running interval 'update' with interval=60000 last_execution=44558 (now=104560)
[14:42:16][V][bme280.sensor:210]: Sending conversion request...
[14:42:16][VV][i2c.arduino:176]: 0x77 TX F4B5
[14:42:16][VV][scheduler:032]: set_timeout(name='data', timeout=114)
[14:42:16][VV][scheduler:226]: Running timeout 'data' with interval=114 last_execution=104583 (now=104699)
[14:42:16][VV][i2c.arduino:176]: 0x77 TX F7
[14:42:16][VV][i2c.arduino:148]: 0x77 RX 5636F083345071C2
[14:42:16][V][bme280.sensor:242]: Got temperature=27.9°C pressure=986.6hPa humidity=42.3%
[14:42:16][V][sensor:043]: 'BME280 Temperature': Received new state 27.907148
[14:42:16][D][sensor:094]: 'BME280 Temperature': Sending state 27.90715 °C with 1 decimals of accuracy
[14:42:16][VV][api.service:140]: send_sensor_state_response: SensorStateResponse {
  key: 1168764344
  state: 27.9071
  missing_state: NO
}
[14:42:17][V][sensor:043]: 'BME280 Pressure': Received new state 986.615601
[14:42:17][D][sensor:094]: 'BME280 Pressure': Sending state 986.61560 hPa with 1 decimals of accuracy
[14:42:17][VV][api.service:140]: send_sensor_state_response: SensorStateResponse {
  key: 849378863
  state: 986.616
  missing_state: NO
}
[14:42:17][V][sensor:043]: 'BME280 Humidity': Received new state 42.288086
[14:42:17][D][sensor:094]: 'BME280 Humidity': Sending state 42.28809 % with 1 decimals of accuracy
[14:42:17][VV][api.service:140]: send_sensor_state_response: SensorStateResponse {
  key: 4217600373
  state: 42.2881
  missing_state: NO
}
[14:42:17][W][component:237]: Component bme280_base took a long time for an operation (113 ms).
[14:42:17][W][component:238]: Components should block for at most 30 ms.
[14:42:21][VV][scheduler:226]: Running interval 'update' with interval=60000 last_execution=48877 (now=108878)
[14:42:21][VV][scheduler:032]: set_timeout(name='0x1701707e1f64ff28', timeout=750)
[14:42:21][VV][scheduler:226]: Running timeout '0x1701707e1f64ff28' with interval=750 last_execution=108890 (now=109641)
[14:42:21][VV][dallas.temp.sensor:136]: Scratch pad: 00.00.00.00.00.00.00.00.00 (00)
[14:42:21][D][dallas.temp.sensor:054]: 'Temp pool depth': Got Temperature=0.0°C
[14:42:21][V][sensor:043]: 'Temp pool depth': Received new state 0.000000
[14:42:21][D][sensor:094]: 'Temp pool depth': Sending state 0.00000 °C with 1 decimals of accuracy
[14:42:21][VV][api.service:140]: send_sensor_state_response: SensorStateResponse {
  key: 322618005
  state: 0
  missing_state: NO
}
2

2 posts were split to a new topic: DS18B20 random problem

4

You do have a pull up resistor connected? And the sensor is connected as a 2-wire (aka, you also supply Vcc to the sensor)?

5

Yes, the Dallas sensor does have pull up resistor connected (although smaller than recommended 4k7 - only something around 2k). The sensor has all 3 wires connected - Vcc (to 3.3V), GND and Data (with pull up resistor).
The bme280 I supposed does not need one.

6

Okay, that’s good :slight_smile:

By itself I2C does also require pull up resistors but most modules with an I2C chip already have them.

Although I would expect ESPHome to make a good distinction between I2C and 1-wire, what if you explicitly add id’s to the busses and add one_wire_id and i2c_id at the components.

7

Try adding an id to the bus and the dallas sensor configs. You might as well add an id to the i2c bus and sensor as well

one_wire:
  - platform: gpio
    pin: GPIO04
    one_wire_id: some_id_name

sensor:
  - platform: dallas_temp
    address: 0x39f3be771f64ff28
    name: "Temp pool surface"
    unit_of_measurement: °C
    icon: "mdi:thermometer"
    accuracy_decimals: 1
    update_interval: 60s
    one_wire_id: some_id_name