CODE
led_on()
Description
Illuminates the green LED of the current Cubelet
Compatibility
All Blocks
Example
    void setup()
    {
        led_on();
    }
    void loop()
    {
        think();
        act();
    }
    void think()
    {
        calculate_block_value();
    }
    void act()
    {
        set_rotate(block_value);
    }