ESPHOME: AdaFruit LED Backpack Integration: ht16k33

CLOCK.h

#include <Adafruit_LEDBackpack.h>
Adafruit_7segment LEDSEG;

esphome::time::ESPTime DTNOW;
char DTSTR[17];
time_t DT;

CLOCK.yaml

logger:
  level: WARN

esphome:
  name: test
  platform: ESP32
  board: esp32dev
  includes: CLOCK.h
  libraries:
    - "SPI"
    - "Wire"
    - "Adafruit BusIO"
    - "Adafruit GFX Library"
    - "Adafruit LED Backpack Library"
  on_boot:
    then:
      - lambda: !lambda |-      
          DTNOW = id(DTHA).now();
          id(LEDSEGCOLON) = true;
          LEDSEG = Adafruit_7segment();
          LEDSEG.begin(0x70);
          LEDSEG.setBrightness(15);
          LEDSEG.blinkRate(HT16K33_BLINK_OFF);

globals:
  - id: LEDSEGCOLON
    type: bool
    restore_value: no

<<: !include CONFIG_WIFI.yaml

time:
  - platform: homeassistant
    id: DTHA

i2c:
  scl: 22
  sda: 21
  frequency: 50000
  scan: true

sensor:
  - platform: template
    name: "T_DT"
    update_interval: 100ms
    lambda: |-
      DTNOW = id(DTHA).now();
      DT = DTNOW.timestamp;
      strftime(DTSTR, sizeof(DTSTR), "%I%M", localtime(&DT));
      return DT;
  - platform: template
    name: "T_LEDSEG"
    update_interval: 750ms
    lambda: |-
      LEDSEG.print(strtoul(DTSTR,NULL,10));
      LEDSEG.drawColon(id(LEDSEGCOLON) = !id(LEDSEGCOLON));
      LEDSEG.writeDisplay();
      return id(LEDSEGCOLON);

Hi,
I'm using your code for a simple clock based on an Adafruit 7 segment display. I've changed the strftime format to "%H%M", as used as a normal way in Europe (24h clock). However, as from midnight until 1:00 am, the clock shows only the minutes (e.g.: ":45" for 0:45). I'd like to change it to 0:45 or even 00:45. How can I achieve this? I think I have to replace "LEDSEG.print(strtoul(DTSTR,NULL,10));" somehow, but unfortunately, I'm not a C++ (or Lambda?) programmer , sorry...

Anyway, thanks in advance for your kind help!

substitutions:
plug_name: ESP32 DEVKITV1

esphome:
name: esp-clock
comment: ${plug_name}
includes: include/Adafruit_LEDBackpack.h
libraries:
- "SPI"
- "Wire"
- "Adafruit BusIO"
- "Adafruit GFX Library"
- "Adafruit LED Backpack Library"

esp32:
board: nodemcu-32s

wifi:
ssid: "yourssid_wifi"
password: "yourpass_wifi"
power_save_mode: none

api:

web_server:
port: 80

logger:
baud_rate: 0

ota:

i2c:
scl: 22
sda: 21
scan: true

text_sensor:

• platform: template
  name: "LED time"
  id: led_time
  icon: mdi:web-clock
  update_interval: 1s
  lambda: |-
  Adafruit_7segment display;
  if (!display.begin()) {
  display = Adafruit_7segment();
  }
  if (id(ha_sun).elevation() < 0) {
  display.setBrightness(1);
  } else {
  display.setBrightness(10);
  }
  auto now = id(ha_time).now();
  char text[6];
  if (now.hour == 0) {
  snprintf(text, sizeof(text), "0%02d", now.minute);
  } else if (now.hour < 10) {
  snprintf(text, sizeof(text), " %d%02d", now.hour, now.minute);
  } else {
  snprintf(text, sizeof(text), "%d%02d", now.hour, now.minute);
  }
  display.print(text);
  static int i = 0;
  if (i == 1) {
  display.drawColon(true);
  } else {
  display.drawColon(false);
  }
  i++;
  if (i == 2) {
  i = 0;
  }
  display.writeDisplay();
  std::string str(text);
  str.insert(str.length() - 2, ":");
  return str;

binary_sensor:

• platform: status
  name: "${plug_name} Status"

switch:

• platform: restart
  name: "${plug_name} Restart"

status_led:
pin:
number: GPIO2
inverted: false

time:

• platform: homeassistant
  id: ha_time

sun:
latitude: 88.88°
longitude: 88.88°
id: ha_sun