Design and development of flood sensor

Thread Starter

aneesha

Joined Jun 6, 2011
1
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.
 

Kermit2

Joined Feb 5, 2010
4,162
...So now i don know how to design this circuit ? I really appreaciate if someone help me for this.
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?
 
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