In this project, we will make Flood Monitoring System using Raindrop Sensor & Raspberry Pi Pico. A raindrop sensor is basically a board on which nickel is coated in the form of lines. It works on the principle of resistance. The rain Sensor module allows to the measurement of moisture via analog output pins and it provides a digital output when a threshold of moisture exceeds.
It stimulates the flood control alarm system, judges whether there is a flood disaster through the amount of rain detected by the sensor panel of the raindrop sensor, and then controls the buzzer to emit a siren sound and displays the alarm information on the 16×2 LCD screen.
In this guide, I used to test different Modules. You can buy the kit and perform some other operations as well. From this kit, you can use the following components.
1. Raspberry Pi Pico Board – 1
2. 16×2 I2C LCD Display – 1
3. Raindrop Sensor Module – 1
4. Breadboard – 1
5. Buzzer – 1
6. Jumper Wires – 10
7. Micro-USB Cable – 1
A raindrop sensor is a kind of sensing device, which is mainly used to detect whether it rains and the amount of rain, and is widely used in automobile automatic wiper systems, intelligent lighting systems, and intelligent sunroof systems.
It consists of two parts, one is a sensor panel for detecting rainwater, and the other is a control module that converts the detected signal into an electrical signal.
The control module of the raindrop sensor has 4 outputs. VCC & GND is connected to a 5V supply & GND. The D0 pin is connected to the digital pin of the microcontroller for digital output. For the analog output, the analog pin can be used. To use the analog output, the A0 pin can be connected to the ADC pin of any microcontroller.
The sensor module consists of a potentiometer, LM393 comparator, LEDs, capacitors, and resistors. The rainboard module consists of copper tracks, which act as a variable resistors. Its resistance varies with respect to the wetness of the rainboard.
The schematic for the Flood Monitoring with Raindrop Sensor, Raspberry Pi Pico & LCD Display is given below.
Connect the LCD VCC & GND Pin to Raspberry Pi Pico 5V & GND Pin respectively. Connect the SDA & SCL pins of the LCD to Raspberry Pi Pico GP0 & GP1 pins respectively.
The VCC, GND & analog output pin of the Raindrop Sensor is connected to the VSYS, GND & GP26 of Raspberry Pi Pico. There is a Buzzer used for indication. The buzzer is connected to GP18 of Raspberry Pi Pico.
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