LCD w/ESP8266 to display Home Assistant Entity

ESPHome
1

Hey yall. I am trying to get a 8266 with a PCF8574 lcd display to display a home assistant entity. My code is below. I keep just getting a display on ‘nan.’ I also get an error in the logs of:
[13:21:25][W][component:214]: Component display took a long time for an operation (0.29 s).
[13:21:25][W][component:215]: Components should block for at most 20-30ms.

Please help. Im at a loss.

Code:
i2c:
sda: D6
scl: D5

sensor:

  • platform: homeassistant
    entity_id: sensor.watertanklevel_water_level_2
    unit_of_measurement: “Gallons”
    id: Water_Level
    internal: true

display:

  • platform: lcd_pcf8574
    dimensions: 20x4
    address: 0x3F
    update_interval: 1s
    lambda: |-
    it.printf(“%.1f”, id(Water_Level).state);
2

Hi - please edit your post so your yaml is enclosed in preformatted text tags. They are accessed using </> on the posting toolbar.

The error message is just a warning. Most display components give this warning, ignore it.

The “nan” display is “not a number”. What does the log say about the sensor you are importing from home assistant?

3

Thank you for your thoughts. Here is what the logs say about the sensor… I know the sensor is working because its displayed in home assistant.

[16:14:08][C][i2c.arduino:053]: I2C Bus:
[16:14:08][C][i2c.arduino:054]:   SDA Pin: GPIO4
[16:14:08][C][i2c.arduino:055]:   SCL Pin: GPIO5
[16:14:08][C][i2c.arduino:056]:   Frequency: 50000 Hz
[16:14:08][C][i2c.arduino:059]:   Recovery: bus successfully recovered
[16:14:08][I][i2c.arduino:069]: Results from i2c bus scan:
[16:14:08][I][i2c.arduino:075]: Found i2c device at address 0x3F
[16:14:08][C][lcd_pcf8574:024]: PCF8574 LCD Display:
[16:14:08][C][lcd_pcf8574:025]:   Columns: 20, Rows: 4
[16:14:08][C][lcd_pcf8574:026]:   Address: 0x3F
[16:14:08][C][lcd_pcf8574:027]:   Update Interval: 1.0s
[16:14:08][C][captive_portal:088]: Captive Portal:
[16:14:08][C][mdns:115]: mDNS:
[16:14:08][C][mdns:116]:   Hostname: tankdisplay
[16:14:08][C][ota:097]: Over-The-Air Updates:
[16:14:08][C][ota:098]:   Address: tankdisplay.local:8266
[16:14:08][C][ota:101]:   Using Password.
[16:14:08][C][api:139]: API Server:
[16:14:08][C][api:140]:   Address: tankdisplay.local:6053
[16:14:08][C][api:142]:   Using noise encryption: YES
[16:14:08][C][homeassistant.sensor:030]: Homeassistant Sensor 'Water_Level'
[16:14:08][C][homeassistant.sensor:030]:   State Class: ''
[16:14:08][C][homeassistant.sensor:030]:   Unit of Measurement: 'Gallons'
[16:14:08][C][homeassistant.sensor:030]:   Accuracy Decimals: 1
[16:14:08][C][homeassistant.sensor:031]:   Entity ID: 'sensor.watertanklevel_water_level_2'
4

And… Turns out I just had to add it to home assistant… Its working now. thanks!