esphome-matrix-clock.yaml

esphome:
  name: esphome-web-XXX
  friendly_name: MatrixClock

esp8266:
  board: esp01_1m

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "XXX"

ota:

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esphome-Web-XXXX"
    password: "XXXX"

captive_portal:

# Download the font here:
# https://www.dafont.com/pixelmix.font
font:
  - file: "pixelmix.ttf"
    id: digit_font
    size: 8
    
spi:
  clk_pin: 14
  mosi_pin: 13

# More info here:
# https://esphome.io/components/display/max7219digit.html
display:
  - platform: max7219digit
    cs_pin: 15
    num_chips: 4
    intensity: 2
    lambda: |-
      it.strftime(5, 0, id(digit_font), "%H:%M", id(hass_time).now());

time:
  - platform: homeassistant
    id: hass_time