Logger warning: Graphing reducing y-scale to prevent too many gridlines

ESPHome
1

I set up a Heltec ESP32 with a built in OLED screen like this and I’m using it to graph temp and humidity values.

Seems to be working but the log is spamming the warning [W][graph:121]: Graphing reducing y-scale to prevent too many gridlines

I’m confused because I’m not using gridlines. Here is my YAML

esphome:
  name: esp-test-temp-snsr
  platform: ESP32
  board: heltec_wifi_kit_32

# Enable logging
logger:

# Enable Home Assistant API
api:

ota:
  password: "623a1961e2f93afa685ca58d0bce5972"

wifi:
  ssid: "[redacted"
  password: "[redacted]"
  power_save_mode: none

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Living-Room-Temp-Sensor"
    password: "fallback"

captive_portal:

i2c:
  scl: 15
  sda: 4


sensor:
  - platform: wifi_signal
    name: "espTestSensor AC wifi signal"
    update_interval: 60s
  - platform: uptime
    name: "espTestSensor Basement AC uptime"
  - platform: dht
    pin:
      number: GPIO5
      mode: INPUT_PULLUP
    temperature:
      id: 'temp'
      name: "ESP Test temperature"
      filters:
      - lambda: return x * (9.0/5.0) + 32.0;
      unit_of_measurement: "°F"
    humidity:
      id: 'hum'
      name: "ESP Test Humidity"
    update_interval: 60s
    model: DHT22_TYPE2
font:
# gfonts://family[@weight]
  - file: "arial.ttf"
    id: arial
    size: 12
graph:
  # Show multi-trace graph
  - id: temp_humidity_graph
    duration: 1h
    width: 128
    height: 64
    traces:
      - sensor: hum
        line_type: DASHED
        line_thickness: 1
      - sensor: temp
        line_type: SOLID
        line_thickness: 2

display:
  - platform: ssd1306_i2c
    model: 'SSD1306 128x64'
    reset_pin: 16
    address: 0x3C
    lambda: |-
      it.printf(5, 10, id(arial), "Temp : %.1f °f", id(temp).state);
      it.printf(5, 25, id(arial), "Hum  : %.1f %%", id(hum).state);
      it.graph(0, 0, id(temp_humidity_graph));
2

Came across the exact problem. You can suppress logs from specific modules, like graph, to hide the messages:

# Enable logging
logger:
  level: WARN
  logs:
    graph: ERROR