Sensors¶

The SHT40 reports temperature and humidity over I2C. Two more sensors watch the device itself.

i2c:
  sda: GPIO8
  scl: GPIO18

sensor:
  - platform: sht4x
    address: 0x44
    update_interval: 10s
    temperature:
      name: Temperature
      id: temp_c
      accuracy_decimals: 1
    humidity:
      name: Humidity
      id: hum_pct
      accuracy_decimals: 0

  - platform: wifi_signal
    id: wifi_rssi_db
    name: WiFi Signal
    entity_category: diagnostic
    update_interval: 10s

  - platform: uptime
    name: Uptime
    entity_category: diagnostic

text_sensor:
  - platform: wifi_info
    ip_address:
      id: wifi_ip
      internal: true
    ssid:
      id: wifi_ssid_ts
      internal: true

Pins¶

Signal	Pin	Wired in
SDA	GPIO8	SHT40 (checkpoint 3)
SCL	GPIO18	SHT40 (checkpoint 3)

The sensor answers at 0x44 every 10 seconds. After flash, the boot log should show that address — see Flash the ESP32.

What appears in Home Assistant¶

Entity	Where	Used on screen as
Temperature	Main, 1 decimal	`temp_c`
Humidity	Main, whole %	`hum_pct`
WiFi Signal	Diagnostic	`wifi_rssi_db` (dBm + strength icon)
Uptime	Diagnostic	—
SSID / IP (`wifi_info`)	Internal only	`wifi_ssid_ts` / `wifi_ip` on the run page

Each name becomes an entity. Each id lets other blocks (the display) read the value. entity_category: diagnostic keeps signal and uptime out of the main list. The wifi_info text sensors stay internal so they feed the screen without cluttering Home Assistant.

Next: Display