When there is no rain, the aluminium wire on the sensor will not conduct as they do not have any conduction path (open circuit). As a result, the sensor cannot trigger the 555 Timer IC and there will be no alarm.
you can make a good simple rain alarm using just two transistors [BC109] one resistor [330K] and one capacitor.[0.1uf] A simple censor that works well is made with a piece of veroboard connecting intermediate tracks together. Any small L.S. 0-100 ohms will give a good response and can be powered from 3-9 volts. So why all the fuss and bother with a 555 chip and all the components, being a total waste of time and money for an alarm that is no better. I have used my circuit, which has given me good service for over 5 years, replacing the 9 volt battery only once. .
Project Report On Rain Alarm Pdf Download
PROBLEM STATEMENT People always hang out their clothes outside the house under the sun. However, sometimes when it is raining, we cannot notice and bring the clothes into the house timely. ABSTRACT The need for electronic rain alarm system on houses, even in the absence of human being, to ensure our clothes are not affected by rain is a serious demand. We, therefore, intend to provide a solution by constructing an electronic rain alarm system that has the capability of detecting rain as fast as possible. The project involves the use of transistor, indicator, circuit board, battery, battery holder, and buzzer. The circuit board detects the flow of water and will make the current flow through the circuit and trigger the indicator as well as the buzzer to alert the users. With this project, we can warm the people that it will start raining.
CONCLUSION The results of our electronic rain alarm system was a success. When we put some water on the circuit board, the rain alarm worked and produced a sound, however, this is as long the electronic devices are not damaged by the water droplets. After testing our project multiple times, we believed that it could be used for a better future.
The rain water detector project is a simple circuit which senses the rain and makes an alert. A rain water detector can be used in the irrigation field, home automation, communication, automobiles etc.
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