// create a slider
Evas_Object *slider = elm_slider_add(ad->win);
evas_object_resize(slider, 300, 50);
evas_object_move(slider, 50, 50);
evas_object_show(slider);

// set slider mode (in case of horizontal it's unnecessary)
elm_slider_horizontal_set(slider, EINA_TRUE);

// set maximum and minimum values
elm_slider_min_max_set(slider, 0, 100);

// set step for slider's indicator
elm_slider_step_set(slider, 0.1);

// set value
elm_slider_value_set(slider, 50);

// read slider's current value
elm_slider_value_get(slider);