10-06-2017, 07:14 AM
rain detector alarm
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 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 alarm is an application which detects the rain water and blows alarm. They are useful devices and play an important role in various industries such as automobile, irrigation, and wireless communication. Desiging a rain alarm system is quite simple and we have designed here a demo rain alarm project with the help of 555 Timer IC.
Components
Rain sensor (Either you can purchase or build yourself)
555 Timer IC
NPN Transistor BC547
Resistors (470, 100k and 1k ohm)
Capacitor (10uf)
Buzzer
Battery 9v
The main component of this rain alarm is rain sensor, I have purchased one, but we can also build it at home. It s very easy to create a rain sensor. Take a sheet of Bakelite or mica, and paste the aluminium wire on it according to the diagram shown below. The Gap between the wires should be around 3-5mm. You can see that whenever the rain drop would fall on rain sensor, it will short the point A and B and a voltage would get applied on the base of Transistor, and it will become ON. We can also use copper wire for rain sensor but copper generally reacts to oxygen to form oxide, so it needs to be cleaned on regular basis.