esp32_clock/esp32-clock-template.yaml

esphome:
  name: esphome-clock
  friendly_name: ESPHome Clock

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:
  logs:
    sensor: INFO

# Enable Home Assistant API
api:
  reboot_timeout: 0s
  encryption:
    key: ""

ota:


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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "ESP32Clock"
    password: "fallBackPass"

captive_portal:

web_server:
  local: true

external_components:
  - source:
      type: local
      path: components

time:
  - platform: sntp
    id: sntp_time
    timezone: Europe/Berlin
    on_time:
      - seconds: /10
        then:
          - logger.log:
              level: INFO
              format: "%2d %2d %2d %2d"
              args:
                - 'uint32_t(id(runtime).state/3600) - uint32_t(id(runtime).state/86400)*1440'
                - 'uint32_t(id(runtime).state/60) - uint32_t(id(runtime).state/3600)*60'
                - 'uint32_t(id(runtime).state) - uint32_t(id(runtime).state/60)*60'
                - 'uint32_t((id(runtime).state - uint32_t(id(runtime).state))*25)'

spi:
  clk_pin: GPIO18
  mosi_pin: GPIO19

sensor:
  - platform: uptime
    id: runtime
    update_interval: 100ms

display:
  - platform: spi_74hc595_display
    cs_pin: GPIO5
    data_rate: 5MHz
    num_chips: 3
    update_interval: 40ms
    lambda: |-
      static uint32_t clock_frames=0;
      static uint32_t old_clock=0;

      if(id(sntp_time).now().second!=old_clock){
        clock_frames=0;
        old_clock=id(sntp_time).now().second;
      } else {
        clock_frames++;
      }

      it.printf(0, ".*-_'`,0");
      /*it.strftime(0, "%H%M%s", id(sntp_time).now());*/
      /*it.printf(6, "%2d", clock_frames);*/

      it.strftime(8, "%H%M%s", id(sntp_time).now());
      it.printf(14, "%2d", clock_frames);
      /*it.strftime(8, "%H%M%s", id(sntp_time).now());*/
      /*it.printf(14, "%1d", 0)*/

      it.printf(16, "%2d%2d%2d%2d",
        uint32_t(id(runtime).state/3600) - uint32_t(id(runtime).state/86400)*1440,
        uint32_t(id(runtime).state/60) - uint32_t(id(runtime).state/3600)*60,
        uint32_t(id(runtime).state) - uint32_t(id(runtime).state/60)*60,
        uint32_t((id(runtime).state - uint32_t(id(runtime).state))*25) );

# the first display should display a test string to figure out the digit and segment map:
# digit 0: >.< character (dot segment on)
# digit 1: >*< character (upper segment on)
# digit 2: >-< character (middle segment on)
# digit 3: >_< character (lower segment on)
# digit 4: >'< character (upper left segment on)
# digit 5: >`< character (upper right segment on)
# digit 6: >,< character (lower right segment on)
# digit 7: >9< character (all on, except lower left segment)