Now time to put the compiled circuit in a small box. Here i chose a Junction box that are used in electrical wiring. It was a perfect box for this project.

Now the tricky part is making holes in the plastic junction box so that LED can easily slip through the holes, also the spacing between the LED's should be proportionate. First take the box and draw the outline in the face of the box. First for the switch you should make a marking at the bottom right hand side. Then mark the points for the LED's. As told earlier it should be proportionate. Now unbend a paper clip and heat it with a soldering iron and make holes to the marked points as shown in the figure.



Then cut the plastic board for the power switch. After the cut is made file at the edges so that the cut is smooth and the switch can easily fit to into the cut. Fit in the Power Switch.



Time for adding the LED's to the panel. Let's start by adding the Red LED from the bottom end. Then to the Yellow and Green and finally Blue. This LED's should be then be soldered to the PCB as shown in the circuit diagram. For me what i did was soldered directly to the PCB below the front panel, as it gave a solid base for the LED's.



Now fix the buzzer just beside the PCB and give the connection from the circuit board. Then also fix the Power supply at the box with the help of nuts holding the transformer firmly to the box.



For making a junction of the sensors you can use a cable connector, i used from a used TV circuit board as shown. This connector was actually connecting some wires with the television PCB to the CRT(Cathod Ray Tube of the TV), therefore i decided to use this as it had many pins. I then cut it from the PCB and numbered it from 1 going up till 8. You will notice that there were two pins extra, so i made this two pins connect together and made a common point for the sensor going to the tank. The rest of the pins starting from Pin 1 going up till 7 will be for the sensing part which will also be connected to the sensors of the water tank.



The Nos. that i have assigned for the sensors are as follows:-



1: (Level 1) water is considerably low and pump needs to be started

2: (Level 2) water is low

3: (Level 3) Water level is 1/ 4

4: (Level 4) Water level is Half

5: Level 5) Water level is more than half

6: (Level 6) Water level is about to fill up

7: (Level 7) Water level has filled up and alarm starts to sound

8: Common Positive Pin



Therefore there are in total 8 supply line that has to be taken out from the main circuit board to the sensor. After trial and error, and a few failed experiments i found out that the best wire to be used in the project would be a Cat5 cable as it has also in total 4 pairs of wires and this can be blended in this project nicely. As it would be virtually impossible to buy lots of wire and then take it to the tank. It would be messy and there would be all short of wiring problem .

And one advantage in adding a junction, while installation is that there won't be any problem for soldering the wires to the circuit while installation. It would be just plug and play. Therefore after the wire is connected to the connector. I hot glued it as it would keep the wires firmly fixed to the female connector,and there won't be any dis-connection.



My rented house that i live is about 3 stories high and i needed approximately 15 meters of CAT5 Cable.



That end's this part of connecting the cable with the circuit and the next part will be learning to make the sensors for the water tank.