Rain Alarm Project
Water is basic need in every one’s life. Saving and proper usage of water is very important. Here is an easy project which
will give the alarm when there is rain, so that we can make some actions and save the rain water. As a result, we can
increase the water levels of underground water by using underwater recharge technique. Rain water detector will detect the
rain and make an alert; rain water detector is used in the irrigation field, home automation, communication, automobiles etc.
Here is the simple and reliable circuit of rain water detector which can be constructed at low cost.
Rain Alarm Project Block Diagram:
Rain water sensor is the main component in the circuit. For this rain sensor, no need to go and buy in the market or online.
We can do it ourselves just by taking the piece of Bakelite or mica board and aluminum wire. Bakelite or mica board should
be made completely flat and aluminum wire should be pasted on the flat board as shown in the figure below of rain water
sensor. Care should be taken that there should be no spaces between the wire and board. When the rain water sensor is
completed, it should get connected to the circuit and voltage should be passed through the wires.
Rain water sensor diagram is shown below:
If there is no rain, the resistance between the wires will be very
high and there will be no conduction between the wires in the sensor. If there is rain, the water drops will fall on the rain
sensor which will also decrease the resistance between the wires and wires on the sensor board will conduct and trigger the
NE555 timer through the transistors circuitry. Once NE555 is triggered, it will make the output pin high and which will make
the buzzer to make alarm.
