    // set the backlight to a value between 0 and 255
    // the backlight is driven via PWM and is gamma corrected by our
    // library to give a gorgeous linear brightness range.
    pico_explorer.set_backlight(100);

    pico_explorer.set_pen(255, 0, 0);

    while(true) {
        pico_explorer.pixel(point(0, 0));