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Water Sensor Circuit: This circuit can be used to detect water level and same circuit can be used as rain sensing circuit the only need to be replaces is the sensor.

Step 1: Manage the Material and Tools Before Starting Your Task

Material:

1. General Purpose PCB 2x2 inch.

2. Resistor: 10K ---------- 2 Nos.

3. Resistor: 15K ----------1 No.

4. Resistor: 1K ----------1 No.

5. Transistor: 2222A ---------- 2 Nos.

6. Capacitor: 22uF/25V ---------- 1 No.

7. Red LED: 5mm ----------1 No.

8. Black & Red wire ---------- 1 meter.

9. 9V battery with connector ---------- 1 No.

Tool:

Cutter, solder, soldering iron etc.

Step 2: Go Through the Following Steps

1- Mount all the components on the PCB according to the circuit diagram.

2- Connect the battery with correct polarity.

3- Connect the sensor wire together to test initially.

4- Put the sensor wire into the water, LED should glow.

Step 3: Warning

DO NOT CONNECT THE BATTERY IN WRONG POLARITY SINCE IT IS HAVING AN ELECTROLYTIC CAPACITOR AND IT MAY BE DAMAGED AND MAY DAMAGE YOU TOO.

Step 4: Feedback... Why?

Your feedback can be helpful in upgrade of this circuit.

<p>Thanks for the schematic ! I've done one with 5 level sensors, fixed on an indoor wall, to check an outside 1000 L water tank for a remote house in southern France.</p>
<p>bonjour!, Thanks for your comment.</p>
<p>Hi,</p><p>Thank you for the nice and simple tutorial. Can you explain what's the purpose of the capacitor? I have assembled this circuit without it and it works fine.</p>
<p>Hello Alexander, first of all thanks for your comment,</p><p>Yes, it will work without even using capacitor,</p><p>but for DC filter, we often use such capacitor here. since we are using already a battery so there is no problem if this capacitor is not used.</p>
<p>Very nice project. Can you explain how the Transistors help the circuit? I might use this circuit and you simple circuit with my Cub scout den. The explanation of Ohm's law on your simple circuit project is very good. It would be great to have that kind of explanation here. </p>
<p>Hi Ray, first of all thankyou for appreciation.</p><p>In this circuit, I used two transistors (Q1 and Q2), Q1 is used for amplification of weak signal and, Q2 is used as a switch to make the LED ON.</p><p>LED can be replaced by a DC buzzer for sound.</p>
whats the name of sensor?
there's no specific name of this sensor. if you see the picture you can notice that I made this with the help of a plastic pipe, screws and wire piece. actually this is basically a continuity tester, when this goes under water then electric current flows through it.
Where is the sensors photo? :s
<p>Hello friend, thanks for visiting.</p><p>sorry for the delay, I have added two more pictures of sensor and setup.</p>
what sensor???<br>any photo?
<p>Interesting, thanks!</p>
thanks for appreciation folk

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