When you have difficult to know the level of water in the tank you can use this circuit. It will indicate the level of water so you could see the level of water without looking into the tank.
Circuit diagram
This circuit constructed with transistor A1015, it is a PNP plastic encapsulated transistor. Use different height of insulator removed wire as shown in the circuit diagram.
Components List
| S.No | Name | Quantity |
| 1. | Transistor PNP A1015 | 3 |
| 2. | LED Green Yellow Red |
1 1 1 |
| 3. | Resistor 470Ω | 6 |
Data sheet you can get A1015 datasheet here…
Project parpose….so I need it topic
Purpose of this Circuit is to Introduce Transistor as a switch and Water level indication.