LED
A rendered indicator drawn as a glowing rectangle, controlled via lv_led_on, lv_led_off, and lv_led_set_brightness. Not tied to hardware.
Three LEDs at different brightness
One LED off, one dimmed red at mid brightness, and one fully on.
Three lv_led objects are placed left of centre, at centre, and
right of centre. The first is turned off with lv_led_off, the
second is tinted red via lv_led_set_color and dimmed to
brightness 150 with lv_led_set_brightness, and the third is
switched on with lv_led_on.
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