ESP32 C3 Test for the Lilygo T-01 Plus board for ESPHome. That's the ESP C3 board from lilygo with the 16340 battery. Example yaml has various sensors to pick up in HA, and the onboard LED is also a status LED (It's GREEN!) IO3.

lilygo-t01-plus.yaml

substitutions:
  display_name: 'ESP32 C3 Lilygo T01 Plus'
  device_description: 'ESP32 C3 Test for the Lilygo T01 Plus board'
  friendly_name: 'ESP32 C3 Lilygo T01 Plus'
  device_name: lilygo-t01-plus
  node_name: lilygo_t01_plus

esphome:
  name: ${device_name}
  platformio_options:
    board_build.flash_mode: dio
  comment: ${device_description}
  on_boot:
    - priority: 800.0
      then:
        - component.update: ${node_name}_uptime_raw
        - component.update: wifisignal

esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: esp-idf
    platform_version: 3.3.2

# Enable logging
logger:

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

ota:
  password: "OTA_PASSWORD_HERE"

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

  # Enable fallback hotspot in case wifi connection fails
  ap:
    ssid: "Lilygo-T01-Plus Fallback Hotspot"
    password: "AP_PASSWORD_HERE"

light:
  - platform: status_led
    name: "Onboard LED"
    pin: GPIO3  
    id: esp32c3_onboard_led
    icon: mdi:led-off
    effects:
      - strobe:
      - strobe:
          name: Strobe Fast
          colors:
            - state: true
              duration: 100ms
            - state: false
              duration: 100ms
      - strobe:
          name: Heartbeat
          colors:
            - state: true
              duration: 100ms
            - state: false
              duration: 100ms        
            - state: true
              duration: 100ms
            - state: false
              duration: 1000ms                
    
button:
  - platform: restart
    name: ${display_name} restart

text_sensor:
  - platform: wifi_info
    ip_address:
      name: ${display_name} IP Address
    ssid:
      name: ${display_name} Connected SSID
    bssid:
      name: ${display_name} Connected BSSID   
  - platform: template
    name: ${friendly_name} Uptime
    id: ${node_name}_uptime
    icon: mdi:clock-start
    
binary_sensor:
  - platform: status
    name: ${display_name} Status
  
sensor:
  - platform: wifi_signal
    name: ${display_name} WiFi Singal Strength
    id: wifisignal
    update_interval: 120s

  - platform: uptime
    name: "${friendly_name} Uptime Sensor"
    id: ${node_name}_uptime_raw
    update_interval: 60s
    on_raw_value:
      then:
        - logger.log:
            format: "Raw Value of Uptime sensor: %f, %f"
            args: ['id(${node_name}_uptime_raw).raw_state', 'id(${node_name}_uptime_raw).state']
            level: INFO
        - text_sensor.template.publish:
            id: ${node_name}_uptime
            state: !lambda |-
              int seconds = round(id(${node_name}_uptime_raw).raw_state);
              int days = seconds / (24 * 3600);
              seconds = seconds % (24 * 3600);
              int hours = seconds / 3600;
              seconds = seconds % 3600;
              int minutes = seconds /  60;
              seconds = seconds % 60;
              return (
                (days ? to_string(days) + "d " : "") +
                (hours ? to_string(hours) + "h " : "") +
                (minutes ? to_string(minutes) + "m " : "") +
                (to_string(seconds) + "s") 
              ).c_str();