Rain Alarm

rain sensor or rain switch is a switching device activated by rainfall. There are two main applications for rain sensors. The first is a water conservation device connected to an automatic irrigation system that causes the system to shut down in the event of rainfall. The second is a device used to protect the interior of an automobile from rain and to support the automatic mode of windscreen wipers. An additional application in professional satellite communications antennas is to trigger a rain blower on the aperture of the antenna feed, to remove water droplets from the Mylar cover that keeps pressurized and dry air inside the waveguides.

Hardware Requirements:

  • Rain Sensor
  • Arduino
  • Alarm system
  • Regulated Power Supply

Software Requirements:

  • Arduino IDE

Working procedure:

If the rain sensor plate of the rain sensor module is in dry state, analog output (AO) from the module is 5V. During rain, the sensor plate elements are bridged by the rainwater and hence this analog output gradually changes from 5V to 0V, based on the moisture level between the sensor pads.

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