Description
How does Rain Sensor work?
The working of the rain sensor is pretty straightforward.The sensing pad with series of exposed copper traces, together acts as a variable resistor (just like a potentiometer) whose resistance varies according to the amount of water on its surface.
This resistance is inversely proportional to the amount of water:
- More water on the surface means better conductivity and will result in a lower resistance.
- The less water on the surface means poor conductivity and will result in higher resistance.
The sensor produces an output voltage according to the resistance, which by measuring we can determine whether it’s raining or not.
Specifications – Raindrop Detection Sensor Module
- This sensor module uses good quality of double-sided material.
- Anti-conductivity & oxidation with long time use
- The area of this sensor includes 5cm x 4cm and can be built with a nickel plate on the side
- The sensitivity can be adjusted by a potentiometer
- The required voltage is 5V
- The size of the small PCB is 3.2cm x 1.4cm
- For easy installation, it uses bolt holes
- It uses an LM393 comparator with wide voltage
- The output of the comparator is a clean waveform and driving capacity is above 15mA
Applications -Raindrop Detection Sensor Module
- This sensor is used as a water preservation device and this is connected to the irrigation system to shut down the system in the event of rainfall.
- This sensor is used to guard the internal parts of an automobile against the rainfall as well as to support the regular windscreen wiper’s mode.
- This sensor is used in specialized satellite communications aerials for activating a rain blower over the opening of the aerial feed, to get rid of water droplets from the mylar wrap to keep pressurized as well as dry air within the waveguides.
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