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Rain Detection Alarm System using AtTiny85 - Rain Sensor

October 03, 2022 by CIRCUITS DIY

In this Tutorial, We are Going To Make Rain Detection Alarm System using AtTiny85


The weather has been known to be unpredictable. Although, rain is a source of affection for humans and soothes the soul of a person. But sometimes unpleasant things happen if we get no alert. As a result, it may put a lot of things at risk. Therefore the rain sensor was created so that people can get notified when it rains. It is also found in electrical shutters and windows. This sensor is also used in the automotive industry for car applications, among other things. Therefore in this article, we are going to make. Rain Detection Alarm System using AtTiny85.

An Overview of Rain Sensor

The sensor's detecting pad is primarily made up of copper traces. The variable resistor is made up of these traces. As a result, the resistance varies depending on how much water is on the surface. Higher conductivity equals lower resistance, hence more water implies lower resistance. Lesser water content means lower conductivity, which equals higher resistance. As a result, this resistance dictates the voltage, which aids in the prediction of rain

Hardware Components

Rain Detection Alarm Circuit

Working Explanation

Connect the circuit, and burn the code in Attiny85 IC. The sensor takes the reading in a way that when there is no rain, the resistance is lower. Therefore the output voltage is higher. This, LED turns ON, and the serial monitor shows the message. When the raindrop appears on the sensor, the resistance gets higher. And, the output voltage gets lower.

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