SHT3X Sensor disturbs ESP8266 Wifi

[RDAF (Anders)]

I have a weird problem. I had a hardware setup with an ESP8266-d1(Lolin) + SHT3X + BME280 + CCS811 connected via I2C.
I had the ESP8266 programmed with Arduino and used MQTT to send sensor input to HA, which worked nicely.

Now I started using ESPHOME and I can very easy make a configuration that does the same (Read sensors every 30. second). However as soon as the SHT3X is a part of the configuration, then the ESP cant find the WIFI network.

If I only configure the SHT3X, then it works fine. If I only configure the BME280 and the CCS811, then it works fine. But if I combine the SHT3X with either the BME280 or the CCS811, then the ESP cant fint the wifi and looses connection to ESPHOME.

I tried external power, capacitor on the supply, different wiring. And the exact same setup works fine in Arduino.

Any ideas?

Update:
It doesn’t matter whether the SHT3X is connected or not. It is enought to define a SHT3Xd sensor in ISPHOME, then the wifi doesnt find any networks.

[vincen (Vincèn)]

Can you connect at the ESP by USB ? so you can check logs of ESP when it boots with problematic code for SHT ?
Please share also your yaml just in case

[RDAF (Anders)]

esphome:
  name: esp8266-wemos2
  friendly_name: ESP8266-wemos2

esp8266:
  board: esp01_1m

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "Ssp..."

ota:
  password: "f02..."

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esp8266-Wemos2 Fallback Hotspot"
    password: "pR..."

captive_portal:


i2c:
  - id: bus_a
    sda: 4
    scl: 5
    scan: true  
    frequency: 100kHz

sensor:

#  - platform: sht3xd
#    temperature:
#      name: "Living Room Temperature"
#    humidity:
#      name: "Living Room Humidity"
#    i2c_id: bus_a
#    address: 0x44
#    update_interval: 15s


  - platform: ccs811
    eco2:
      name: "CCS811 eCO2 Value"
    tvoc:
      name: "CCS811 Total Volatile Organic Compound"
    i2c_id: bus_a
    address: 0x5A
    update_interval: 20s   
    baseline: 0xB2BD 

  - platform: bme280
    temperature:
      name: "BME280 Temperature"
      oversampling: 16x
    pressure:
      name: "BME280 Pressure"
    humidity:
      name: "BME280 Humidity"
    i2c_id: bus_a
    address: 0x76
    update_interval: 20s

[RDAF (Anders)]

I normally connect via USB, because OTA update doesnt work without Wifi.

Output with SHT3X coonfigured (No Wifi working)
[D][wifi:425]: Starting scan…
[D][ccs811:091]: Status indicates no data ready!
[D][sht3xd:060]: Got temperature=28.42°C humidity=57.57%
[D][sensor:093]: ‘Living Room Temperature’: Sending state 28.42069 °C with 1 decimals of accuracy
[D][sensor:093]: ‘Living Room Humidity’: Sending state 57.57076 % with 1 decimals of accuracy
[D][sensor:093]: ‘BME280 Temperature’: Sending state 27.70000 °C with 1 decimals of accuracy
[D][sensor:093]: ‘BME280 Pressure’: Sending state 1014.75342 hPa with 1 decimals of accuracy
[D][sensor:093]: ‘BME280 Humidity’: Sending state 53.24316 % with 1 decimals of accuracy
[D][wifi:440]: Found networks:
[D][wifi:442]: No network found!
[D][sht3xd:060]: Got temperature=28.45°C humidity=56.22%
[D][sensor:093]: ‘Living Room Temperature’: Sending state 28.45007 °C with 1 decimals of accuracy
[D][sensor:093]: ‘Living Room Humidity’: Sending state 56.21729 % with 1 decimals of accuracy
[D][wifi:425]: Starting scan…
[D][wifi:440]: Found networks:
[D][wifi:442]: No network found!
[D][sensor:093]: ‘BME280 Temperature’: Sending state 27.69000 °C with 1 decimals of accuracy
[D][sensor:093]: ‘BME280 Pressure’: Sending state 1014.73560 hPa with 1 decimals of accuracy
[D][sensor:093]: ‘BME280 Humidity’: Sending state 52.13672 % with 1 decimals of accuracy
[D][ccs811:091]: Status indicates no data ready!
[D][wifi:425]: Starting scan…
[D][sht3xd:060]: Got temperature=28.46°C humidity=57.50%
[D][sensor:093]: ‘Living Room Temperature’: Sending state 28.46342 °C with 1 decimals of accuracy
[D][sensor:093]: ‘Living Room Humidity’: Sending state 57.50210 % with 1 decimals of accuracy

[vincen (Vincèn)]

Full sketch not a part of it !!!

[RDAF (Anders)]

Network part without SHT3X:

[D][wifi:425]: Starting scan...
[D][wifi:440]: Found networks:
[I][wifi:483]: - 'KMV1' (08:9B:.....
[D][wifi:485]:     Channel: 11
[D][wifi:486]:     RSSI: -74 dB
[I][wifi:483]: - 'KMV11' (08:9B:......
[D][wifi:485]:     Channel: 11
[D][wifi:486]:     RSSI: -79 dB
[D][wifi:488]: - '' (62:9B:.....
[D][wifi:488]: - 'HUAWEI-E5186-C420' (8C:EB:...
[D][wifi:488]: - 'NOKIA-E6D0' (80:AB:...
[D][wifi:488]: - '' (62:AB:4D:.....
[I][wifi:274]: WiFi Connecting to 'KMV1'...
[I][wifi:557]: WiFi Connected!

All sensors are still connected with wires. SHT3X is just removed from config.

[RDAF (Anders)]

Full is uploaded

[JulianDH (Julian Hall)]

  - platform: sht3xd
    temperature:
      name: "Temperature External SHT31"
      accuracy_decimals: 1
    humidity:
      name: "Humidity External SHT31"
      accuracy_decimals: 0
    address: 0x44
    update_interval: 60s

D1 Mini +DHT11+BME680

In my logs I can see I2C scan find the sensor. So I can see this which tells me the SHT31(0x44) has been found. If you are not getting that close then wiring and power to check

[Mahko_Mahko]

Do you know if it is a authentic d1 mini or a clone?

Some of the cheap clones can be pretty flakey when you ask them to do anything more than a minimal task.

Some people have success mitigating issues caused by power demand spikes on boot by spreading some of the set-up at the sensor level.

setup_priority: -100

Is there some way to delay setting up a sensor, is that setup_priority?

I was curious about this and searched the ESPHome Discord for it. It seems some people are using it like this: sensor: - platform: am2320 setup_priority: -100 address: 0x5C temperature: name: "temp02" humidity: name: "humi02" update_interval: 60s I couldn’t find anything on a quick docs check.

This sort of delay on boot can sometimes help too.

on_boot:    
    - priority: 900
      then:
      - lambda: |-
          Wire.begin();
          delay(500);

[RDAF (Anders)]

It does find the sensor when scanning. But as I said, the sensor doesn’t even have to be physically connected. It is enough that I configure it, so that the shr3xd library is loaded. Then it doesn’t work.

And the same physical setup works great with my own arduino scetch.

[RDAF (Anders)]

That did the trick. (And yes, it’s a clone)

Added this to project start:

esphome:

  name: esp8266-wemos2

  friendly_name: ESP8266-wemos2

  on_boot:    

    - priority: 600

      then:

      - lambda: |-

          Wire.begin();

          delay(500);

Setup_priority: -100 did not change anything.

Thx