Pulling sensor data from HA to a display

ESPHome
1

Hi All,

I know there are several tutorials and such on this but I’ve been through all I can find and can’t get it to work. I have a D1 mini running a 1w temp sensor and returning the data to HA, which has worked reliable for months. The sensor id, copied from the sensor data window is:-

sensor.esphome_web_cca271_downstairs_temp

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I have another D1 with an SSD1306 display that I want to display the temperature on. I have the following code:-

esphome:
  name: esphome-web-1444c2
  friendly_name: Dev Board
  min_version: 2024.11.0
  name_add_mac_suffix: false

esp8266:
  board: esp01_1m

# Enable logging
logger:

# Enable Home Assistant API
api:

# Allow Over-The-Air updates
ota:
- platform: esphome

wifi:
  # Set up a wifi access point
  ap: {}

  # fonts
font: 
  - file: "baby_mine_plump.ttf"
    id: font1
    size: 49
  - file: "baby_mine_plump.ttf"
    id: font2
    size: 12

time:
  - platform: homeassistant
    id: esptime

i2c:
  sda: GPIO05
  scl: GPIO04
  scan: false

sensor:
  - platform: homeassistant
    entity_id: sensor.esphome_web_cca271_downstairs_temp
    id: temperature

display:
  - platform: ssd1306_i2c
    model: "SH1106 128x64"
    address: 0x3C
    lambda: |-
      it.printf(0, 15, id(font1), "%.1f°", id(temperature).state);
      it.strftime(0, 0, id(font2), "%H:%M", id(esptime).now());

The time display works but the temperature just states “nan”. I’ve tried with several sensors and nothing is working.
The device log shows this:-

INFO OTA successful
INFO Successfully uploaded program.
INFO Starting log output from 192.168.68.127 using esphome API
INFO Successfully connected to esphome-web-1444c2 @ 192.168.68.127 in 19.684s
INFO Successful handshake with esphome-web-1444c2 @ 192.168.68.127 in 0.021s
[10:18:21][I][app:100]: ESPHome version 2024.12.4 compiled on Feb  1 2025, 10:17:50
[10:18:21][C][wifi:600]: WiFi:
[10:18:21][C][wifi:428]:   Local MAC: C8:C9:A3:14:44:C2
[10:18:21][C][wifi:433]:   SSID: [redacted]
[10:18:21][C][wifi:436]:   IP Address: 192.168.68.127
[10:18:21][C][wifi:439]:   BSSID: [redacted]
[10:18:21][C][wifi:441]:   Hostname: 'esphome-web-1444c2'
[10:18:21][C][wifi:443]:   Signal strength: -56 dB ▂▄▆█
[10:18:21][C][wifi:447]:   Channel: 7
[10:18:21][C][wifi:448]:   Subnet: 255.255.252.0
[10:18:21][C][wifi:449]:   Gateway: 192.168.68.1
[10:18:21][C][wifi:450]:   DNS1: 192.168.1.254
[10:18:21][C][wifi:451]:   DNS2: 192.168.68.1
[10:18:21][C][logger:185]: Logger:
[10:18:21][C][logger:186]:   Level: DEBUG
[10:18:21][C][logger:188]:   Log Baud Rate: 115200
[10:18:21][C][logger:189]:   Hardware UART: UART0
[10:18:21][C][i2c.arduino:071]: I2C Bus:
[10:18:21][C][i2c.arduino:072]:   SDA Pin: GPIO5
[10:18:21][C][i2c.arduino:073]:   SCL Pin: GPIO4
[10:18:21][C][i2c.arduino:074]:   Frequency: 50000 Hz
[10:18:21][C][i2c.arduino:086]:   Recovery: bus successfully recovered
[10:18:21][C][homeassistant.time:010]: Home Assistant Time:
[10:18:21][C][homeassistant.time:011]:   Timezone: 'GMT0BST,M3.5.0/1,M10.5.0'
[10:18:21][C][ssd1306_i2c:023]: I2C SSD1306
[10:18:21][C][ssd1306_i2c:023]:   Rotations: 0 °
[10:18:21][C][ssd1306_i2c:023]:   Dimensions: 128px x 64px
[10:18:21][C][ssd1306_i2c:024]:   Address: 0x3C
[10:18:21][C][ssd1306_i2c:025]:   Model: SH1106 128x64
[10:18:21][C][ssd1306_i2c:027]:   External VCC: NO
[10:18:21][C][ssd1306_i2c:028]:   Flip X: YES
[10:18:21][C][ssd1306_i2c:029]:   Flip Y: YES
[10:18:21][C][ssd1306_i2c:030]:   Offset X: 0
[10:18:21][C][ssd1306_i2c:031]:   Offset Y: 0
[10:18:21][C][ssd1306_i2c:032]:   Inverted Color: NO
[10:18:21][C][ssd1306_i2c:033]:   Update Interval: 1.0s
[10:18:21][C][mdns:116]: mDNS:
[10:18:21][C][mdns:117]:   Hostname: esphome-web-1444c2
[10:18:21][C][esphome.ota:073]: Over-The-Air updates:
[10:18:21][C][esphome.ota:074]:   Address: esphome-web-1444c2.local:8266
[10:18:21][C][esphome.ota:075]:   Version: 2
[10:18:21][C][safe_mode:018]: Safe Mode:
[10:18:21][C][safe_mode:019]:   Boot considered successful after 60 seconds
[10:18:21][C][safe_mode:021]:   Invoke after 10 boot attempts
[10:18:21][C][safe_mode:022]:   Remain in safe mode for 300 seconds
[10:18:21][C][api:140]: API Server:
[10:18:21][C][api:141]:   Address: esphome-web-1444c2.local:6053
[10:18:21][C][api:145]:   Using noise encryption: NO
[10:18:21][C][homeassistant.sensor:030]: Homeassistant Sensor 'temperature'
[10:18:21][C][homeassistant.sensor:030]:   State Class: ''
[10:18:21][C][homeassistant.sensor:030]:   Unit of Measurement: ''
[10:18:21][C][homeassistant.sensor:030]:   Accuracy Decimals: 1
[10:18:21][C][homeassistant.sensor:031]:   Entity ID: 'sensor.esphome_web_cca271_downstairs_temp'
[10:18:22][W][component:237]: Component display took a long time for an operation (319 ms).
[10:18:22][W][component:238]: Components should block for at most 30 ms.
[10:18:23][W][component:237]: Component display took a long time for an operation (319 ms).
[10:18:23][W][component:238]: Components should block for at most 30 ms.

I’m sure it’s something stupid I’ve done but can’t spot it. Can anybody help?

Phil

2

I am using a different method but should it not be something like

"%.1f""°C"
3

What does the log say when the sensor updates? Until it reads a value from HA it will show NAN. Either give the sensor a name or turn up logging to see it in the logs.

4

thanks for the reply. I’ve added your suggestion but i get nanoC now instead of nano.

Phil

5

I hadn’t figured that the sensor would only update when the state changes however the log shows it changing every 30 secs with no update to the display. I’ve given the sensor a name now but not sure what to look for in the logs for it. The ESPhome log looks the same as it did before.

Thanks,

Phil