esphome/tests/components/display/common.yaml

display:
  - platform: ili9xxx
    id: main_lcd
    model: ili9342
    cs_pin: 12
    dc_pin: 13
    reset_pin: 21
    invert_colors: false
    data_rate: 20MHz
    lambda: |-
      // Draw an analog clock in the center of the screen
      int centerX = it.get_width() / 2;
      int centerY = it.get_height() / 2;
      int radius = min(it.get_width(), it.get_height()) / 4;

      // Draw border
      it.circle(centerX, centerY, radius);

      // Draw hour ticks
      for(int h = 0; h < 12; h++) {
        int hourAngle = (h * 30) - 90;

        it.line_at_angle(centerX, centerY, hourAngle, radius - 10, radius);
      }

      // Draw minute ticks
      for(int m = 0; m < 60; m++) {
        int minuteAngle = (m * 6) - 90;

        it.line_at_angle(centerX, centerY, minuteAngle, radius - 5, radius);
      }

      // Nice ring around and some gauge
      it.filled_ring(centerX, centerY, radius+5, radius+8);
      it.filled_gauge(centerX, centerY, radius/2, radius/2-5, 66);