Design and development of flood sensor

Discussion in 'Homework Help' started by aneesha, Jun 6, 2011.

  1. aneesha

    Thread Starter New Member

    Jun 6, 2011
    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.
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    What portion of the circuit can you design? Do you know how to set up opamps as a comparator? Do you understand how to bias a transistor as a switch? Can you calculate the resistor value for an LED based on the voltages in the circuit?