I need to design a circuit a water level sensor that shows 15cm alert by 1 LED Light up and the 15 cm alert will be displayed in LCD display.For 30cm Warning by 2 LED Light up and the 30cm warning will be diaplayed in LCD display and voice message or an alarm. For 45cm Emergency by 3 LED Light up and and the 45cm emergency will be displayed in LCD display, voice message or an alarm and sms. So now i don know how to design this circuit ? I really appreaciate if someone help me for this.