SHT41I not working

ESPHome
1

HI,

I have this home-made (JLCPCB) PCB with an SHT41I connected to GPIOs 21 and 22
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Full project/schematics/layout/etc: electronics-homeassistant-lightscontroll/PCB/schematics-v17-safety-jlcpcb at main · crgarcia12/electronics-homeassistant-lightscontroll · GitHub

I am using this configuration:

i2c:
  id: bus_a
  sda: 21
  scl: 22
  scan: true

sensor:
  - platform: sht4x
    id: temp_sensor
    i2c_id: bus_a
    temperature:
      name: "Temperature"
    humidity:
      name: "Relative Humidity"

But in ESPHome I see Unknown:
image

Do you have any ideas on where I could start the troubleshooting of this?

Thanks!

2

ESP logs?

3

Thank you Tom!
When I restart the device, this is what I can see related to I2C:

[20:59:10][C][i2c:028]: I2C Bus:
[20:59:10][C][i2c:028]: I2C Bus:
[20:59:10][C][i2c:029]:   SDA Pin: GPIO21
[20:59:10][C][i2c:030]:   SCL Pin: GPIO22
[20:59:10][C][i2c:031]:   Frequency: 50000 Hz
[20:59:10][I][i2c:033]: Scanning i2c bus for active devices...
[20:59:10][I][i2c:049]: Found no i2c devices!
...
[20:59:49][W][i2c:070]: Received NACK on transmit of address 0x44
[20:59:49][W][i2c:086]: Requesting 6 bytes from 0x44 failed!
[20:59:49][D][sht4x:083]: Sensor read failed

Is there anywhere else I can search for more logs?

Thanks!

4

The log is quite clear. The ESP is looking for the device on those pins but can’t find them. So either you have wrong pins ( all boards can have different and confusing number systems), device is broken or power. First you need to check the pins

1 Like
5

I replaced the component and now it works (I think) - temp is not as accurate as I was expecting, but that is a different problem

Thanks!!

PS: I have no clue how can i probe the pins of such a small component, will have to do some research