ESPHome config for connected ESP8266 to MAX7219 Dot-Matrix Display to show useful information from HomeAssistant

esphome_dotmatrix_display.yaml

esphome:
  name: veneer_display
  platform: ESP8266
  board: d1_mini

wifi:
  networks:
  - ssid: !secret esphome_wifi_ssid1
    password: !secret esphome_wifi_pass1
  # - ssid: !secret esphome_wifi_ssid2
  #   password: !secret esphome_wifi_pass2

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Veneer Display Fallback Hotspot"
    password: !secret esphome_fb_wifi_pass

web_server:
  port: 80

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: !secret esphome_haapi_pass

ota:
  password: !secret esphome_ota_pass

mqtt:
  broker: !secret mqtt_broker
  username: !secret mqttuser
  password: !secret mqttpass

time:
  - platform: homeassistant
    id: homeassistant_time

spi:
  clk_pin: D5
  mosi_pin: D7

display:
  - platform: max7219digit
    id: display_max
    cs_pin: D8
    num_chips: 8
    intensity: 3
    scroll_speed: 100ms
    update_interval: 100ms
    lambda: |-
      if(id(power_on_off).state) {
        it.printf(0, 0, id(digit_font), TextAlign::TOP_LEFT, "%s", id(hatxt).state.c_str());
        it.intensity(atoi(id(habri).state.c_str()));
        it.scroll_left();
      }

binary_sensor:
  - platform: template
    name: "Power State"
    id: power_on_off
    internal: true

switch:
  - platform: template
    name: "Veneer Display Power Switch"
    icon: mdi:dots-grid
    optimistic: true
    restore_state: yes
    turn_on_action:
      - binary_sensor.template.publish:
          id: power_on_off
          state: ON
    turn_off_action:
      - binary_sensor.template.publish:
          id: power_on_off
          state: OFF

font:
  - file: "pixelmix.ttf"
    id: digit_font
    size: 8
    glyphs:
    - ' '
    - '@'
    - '*'
    - '!'
    - '"'
    - '%'
    - (
    - )
    - +
    - ','
    - '-'
    - .
    - '0'
    - '1'
    - '2'
    - '3'
    - '4'
    - '5'
    - '6'
    - '7'
    - '8'
    - '9'
    - ':'
    - A
    - B
    - C
    - D
    - E
    - F
    - G
    - H
    - I
    - J
    - K
    - L
    - M
    - N
    - O
    - P
    - Q
    - R
    - S
    - T
    - U
    - V
    - W
    - X
    - Y
    - Z
    - _
    - a
    - b
    - c
    - d
    - e
    - f
    - g
    - h
    - i
    - j
    - k
    - l
    - m
    - n
    - o
    - p
    - q
    - r
    - s
    - t
    - u
    - v
    - w
    - x
    - y
    - z
    - °

text_sensor:
  - platform: wifi_info
    ip_address:
      name: "Veneer Display IP Address"
    ssid:
      name: "Veneer Display Connected SSID"
    bssid:
      name: "Veneer Display Connected BSSID"
  - platform: homeassistant
    name: "HA Txt"
    id: hatxt
    entity_id: input_text.venner_text
  - platform: homeassistant
    name: "HA Brightness"
    id: habri
    entity_id: input_number.venner_bri
    
sensor:
  - platform: wifi_signal
    name: "Veneer Display WiFi Signal Sensor"
    update_interval: 60s
  - platform: uptime
    name: "Veneer Display Uptime Sensor"
  - platform: adc
    id: adc_val
    pin: A0
    name: "Veneer Display Brightness"
    update_interval: 60s
    unit_of_measurement: "adc"
    filters:
      - multiply: 3.3
      - calibrate_linear:
          - 0.0 -> 0.0
          - 3.3 -> 15

And write in Cyrillic?

https://www.dafont.com/sprite-coder.font You can check it has multinational glyphs, include it in your project and you should be good to go.

@osfersa @hdjweb Added new version of the code that has power switch on it.

Could you please add a full detailed wiring diagram too pls? I watched both of your videos too about the dot matrix projects but could not find anything on that mater. I cannot get ADC to be working i think i'm missing some wiring... Edit: For those who might learn it now like me. Set up ADC based on the reference below: https://arduino.stackexchange.com/questions/86958/can-arduino-show-the-power-drawn-from-its-output-pin-on-serial-monitor-if-yes

I have tried to get German & Spanish special characters, but no luck yet.

Sorry i dunno what to tell you man,
it is as simple as opening the font you desire to use copying the glyphs to your yaml to use like i did with baltic chars and symbols:

font:
  - file: "Fraset-Display.ttf" #whatever, just make sure you use glyphs that are included in the font file itself unless you don't want to get blanks on  your display... i opened the file  using charmap app on windows, but any app should suffice that is capable of reading font files.
    id: digit_font
    size: 16
    # Font Glyphs:
    glyphs: |-
      AÁBCDEÉFGHIÍJKLMNOÓÖŐPQRSTUÚÜŰVWXYZ aábcdeéfghiíjklmnoóöőpqrstuúüűvwxyz0123456789!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~¡¢£¤¥¦§¨©ª«¬­®¯±´µ¶·¸º»¼½¾¿×÷ˆˇ˘˙˚˛˜˝–—‘’‚“”„†‡•…‰‹›⁄⁰¹²³⁴⁵⁶⁷⁸⁹⁽⁾₀₁₂₃₄₅₆₇₈₉₍₎€ℓ™Ω℮←↑→↓↖↗↘↙∂∆∏∑−∕∙√∞∫≈≠≤≥◊

note that the space between capital and lowercase letters is intentional, we do want our display to understand the space char too ya know ;)
Once you copied all you need, just complie, upload and presto ;)

for this project i used matrix chunky, and the whole glyphmap is:

ґҐўїіѕєѓђёяюэьыъщшчцхфутсрпонмлкйизжедгвбаЯЮЭЬЫЪЩШЧЦХФУТСРПОНМЛКЙИЗЖЕДГВБАЎЇІЅЄЃЂЁώύόϋϊωψχφυτσςρποξνμλκιθηζεδγβαίήέάΫΪΩΨΧΦΥΤΣΡΠΟΞΝΜΛΚΙΘΗΖΕΔΓΒΑΏΎ΍Ό΋ΊΉΈ·ΆſžŽżŻźŹŸŷŶŵŴųŲűŰůŮŭŬūŪũŨŧŦťŤţŢšŠşŞŝŜśŚřŘŗŖŕŔœŒőŐŏŎōŌŋŊʼnňŇņŅńŃłŁŀĿľĽļĻĺĹĸķĶĵĴijIJıİįĮĭĬīĪĩĨħĦĥĤģĢġĠğĞĝĜěĚęĘėĖĕĔēĒđĐďĎčČċĊĉĈćĆąĄăĂāĀÿþýüûúùø÷öõôóòñðïîíìëêéèçæåäãâáàßÞÝÜÛÚÙØ×ÖÕÔÓÒÑÐÏÎÍÌËÊÉÈÇÆÅÄÃÂÁÀ¿¾½¼»º¹¸·¶µ´³²±°¯®­¬«ª©¨§¦¥¤£¢¡~}|{zyxwvutsrqponmlkjihgfedcba`_^]\[ZYXWVUTSRQPONMLKJIHGFEDCBA@?>=<;:9876543210/.-,+*)('&%$#"!‐‑‒–—―•₡₢₣₤₥₦₩₪₫€₭₮₱₲₳₴₵₶₷₸₹₺₼₽₾₿⃀℃℉①②③④⑤⑥⑦⑧⑨⑩⓪□一丁丂七三上下九二五八公六十午四天星月期금목수오요월일전토화후￥

(https://github.com/trip5/Matrix-Fonts)