D1 mini and BME280 help

ESPHome
1

I am new user of ESPHome in home assistant. My first project is a temp, humidity, and pressure sensor with BME280 and a demos D1 mini.

I have connected it like this
G-GND
D1-SCL
D2-SDA
3V3-VCC

IMG_1368
IMG_13681920Ă—2560 371 KB

This is the config:

esphome:
  name: temperatur-fuktighet

esp8266:
  board: d1_mini

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:
  password: "35e5ee6c011fd9dae685d4ba3bsdawbdf34a"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Temperatur-Fuktighet"
    password: "qVtPg4udwewfSg6jWFP"

captive_portal:
 
i2c:
#  sda: 21
#  scl: 22
  scan: true
  id: bus_a
   
sensor:
  - platform: bme280
    temperature:
      name: "Temperature"
      oversampling: 16x
    pressure:
      name: "Pressure"
    humidity:
      name: "Humidity"
    update_interval: 60s
    i2c_id: bus_a
    address: 0x76

I recived this error when i install det sensor:

[I][i2c.arduino:054]: Results from i2c bus scan:
[I][i2c.arduino:056]: Found no i2c devices!
[C][bme280.sensor:143]: BME280:
[C][bme280.sensor:144]:   Address: 0x76
[E][bme280.sensor:147]: Communication with BME280 failed!

Can anyone help to find a solution

2

Try

i2c:
    sda: D1
    scl: D2
    scan: true

Sorry, next to impossible to type this on phone. Looks like you have commented out sda and scl.
Also don’t think you need the line
i2c_id: bus_a in the sensor section.

3

I think Spiro is right, except that scl and sda should be reversed. scl: D1, sda: D2

1 Like
4

Yes I think I changed them round on my wemos. Can’t remember why I did that.:thinking:

5

I am getting the same error in log. Now i am trying this:

 
i2c:
    sda: D1
    scl: D2
    scan: true
   
sensor:
  - platform: bme280
    temperature:
      name: "BME280 Temperature"
      oversampling: 16x
    pressure:
      name: "BME280 Pressure"
    humidity:
      name: "BME280 Humidity"
    address: 0x77
    update_interval: 60s  ```
1 Like
6

Try “address: 0x76”! Some of my BME280 have “0x76”, others “0x77”…

3 Likes
7

Have you kept sda as D1 or D2 as @DelfuegoNL pointed out I had them the wrong way around?

8

Hello ,

Have you been able to resolve it?
I am facing the same thing since a while…

Thanks!

9

Hopefully, this will help you. One way that I test my BMP280 is that I keep it simple, at the start, and only test the temperature section. I also like to use relays in order to test some output pins. You can easily come back and add the pressure sensor. I learned many years ago to keep my variable’s to a minimum… and that was “before” computer programming variables came along. :wink:

esphome:
  name: wemos-test

esp8266:
  board: d1_mini

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:
  password: "test"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "wemos-test"
    password: "test"

captive_portal:

i2c:
  sda: D2  # GPIO4 - Pin numbers aren't always required but I use them.
  scl: D1  # GPIO5
  scan: False  # Removing another variable. The scan feature.

sensor:
  - platform: bmp280
    temperature:
      name: "Heat-Sensor"
    address: 0x76  # possibly 0x77. I don't depend on scan.

#  Test the above code first and then add this lower section if you want to test some output pins.

switch:
  - platform: gpio
    pin: D6
    name: "RelayD6"
    id: RelayD6
    
  - platform: gpio
    pin: D7
    name: "RelayD7"
    id: RelayD7
    
  - platform: template
    name: "Heat Mode"
    id: Heat_Mode
    turn_on_action:
      - then:
        - switch.turn_on: RelayD6
        - switch.turn_on: RelayD7
        - switch.template.publish:
            id: Heat_Mode
            state: ON
    turn_off_action:
      - then:
        - switch.turn_off: RelayD6
        - switch.turn_off: RelayD7
        - switch.template.publish:
            id: Heat_Mode
            state: OFF

Here is some more useful information for anyone starting out with the BMP280 and D1 Mini.

ESP8266_D1Mini_pinout
ESP8266_D1Mini_pinout999Ă—633 177 KB

And here is a link showing how you can change the address on the sensor board, if needed.

https://startingelectronics.org/pinout/GY-BMP280-pressure-sensor-module/

Good luck!

1 Like
10

Using the pin numbers and not the “Dx” number works for me.

# sda, pin GPIO4, D2
# scl, pin GPIO5, D1
i2c:
  sda: 4
  scl: 5
  scan: true
  id: bus_a
11

Sush! Dont disturb the dead.