How to make a weather monitoring system with Raspberry Pi board

Hello and welcome back. In this project, we will learn how to make a weather monitoring system with a Raspberry Pi board. For that, I used the DHT11 sensor, LDR sensor, and Rain sensor. Therefore, we can get the temperature, humidity, lighting values, and rainfall values. I think this project is most suitable for getting the basic knowledge of weather monitoring systems. Also, we can use these systems for any place where weather data activities take place. If you want to do this project with Nodemcu ESP8266, please use the links below. But, you can learn how to do this project with the python language in this project.

Weather monitoring system with Nodemcu ESP8266 – Visit the project

If you need more information about these sensors, please use the links below.

DHT11 sensor — Visit the tutorial

LDR sensor — Visit the tutorial

Rain sensor — Visit the tutorial

If you want to visit our tutorials using an android smartphone, please use the SriTu Hobby app in the play store – click me

OK, let’s do this project step by step. The required components are given below.

Raspberry Pi board — Amazon

DHT11 sensor x 1 — Am a zon / Our Store
LDR sensor x 1 — Amazon / Our Store
Rain sensor x 1 — Amazon / Our Store

LCD screen x 1 — Am a zon / Our Store
I2C module x 1 — Amazon / Our Store
GPIO Extension board x 1 — Amazon / Ban g good

GPIO ribbon cable x 1 — Amazon / Banggood
ADS7830 x 1
Breadboard x 1 — Amazon / Our Store

Male to Male jumper wires x 15 — Amazon / Our Store
Male to Female jumper wires x 4 — Amazon / Our Store

Disclosure: These Amazon links are Affiliate links. As an Amazon Associate, I earn from qualifying purchases.

Step 1

Firstly, identify these components.

Step 2

Secondly, place the GPIO Extension board on the breadboard (If you are using an extension board). You can also do this project without an extension board and ribbon cable.

Step 3

Thirdly, place the ADS7830 (Analog to Digital converter) on the breadboard and connect it to the extension board. If you are not using an extension board, please connect it directly to the Raspberry pi board.

Step 4

And then, connect the sensors one by one to the extension board. As DHT11 sensor, LDR sensor, and rain sensor. For that, you can use the circuit diagram above.

Step 5

Now, connect the LCD screen to the extension board.

Step 6

Next, connect the mouse, keyboard, monitor, ethernet cable, and SD card(OS installed) to the Raspberry Pi board.

Step 7

Finally, connect the GPIO ribbon cable to the Raspberry Pi and provide a power supply to the Raspberry Pi board.

Step 8

Ok, now let’s install the DHT11 library into the OS (operating system). For that, open the terminal and run the following commands one by one. In this case, keep the internet connection enabled.

sudo apt-get update

sudo apt-get install build-essential python-dev python-openssl git

sudo pip3 install adafruit-circuitpython-dht

sudo apt-get install libgpiod2

Now, you can use the DHT11 library.

Step 9

And then, enable I2C communication. If you want to know whether it is enabled or not, please run the following command on the terminal. Then, you can see the I2C module address.

Step 10

OK, now copy and paste the following python script on the Thonny IDE.

Full details of this project — Download
No need to install I2C library. It’s included in the file above. But keep these scripts in one folder.

# Include the library files
import I2C_LCD_driver
from time import sleep
import board
import adafruit_dht
from smbus import SMBus
import RPi.GPIO as GPIO

LDR = 27
bus = SMBus(1)

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

# Set the sensor pin as Input pin
GPIO.setup(LDR,GPIO.IN)

# Create a object for the LCD
lcd = I2C_LCD_driver.lcd()
# Create a object for the DHT11 sensor
DHT11 = adafruit_dht.DHT11(board.D17, use_pulseio=False)

# Starting text
lcd.lcd_display_string("System Loading",1,1)
for a in range (0,16):
    lcd.lcd_display_string(".",2,a)
    sleep(0.1)
lcd.lcd_clear()
lcd.lcd_display_string("Wait..",1,0)

def TempHumi():
    try:
        # Get the Temperature and Humidity values
        temperature_c = DHT11.temperature
        temperature_f = temperature_c * (9 / 5) + 32
        humidity = DHT11.humidity
        
        
        # Print the values on the LCD display
        lcd.lcd_display_string("T:",1,0)
        lcd.lcd_display_string(str(temperature_c) + ".0C",1,2)
        
        lcd.lcd_display_string("H:",2,0)
        lcd.lcd_display_string(str(humidity) + "%",2,2)
        
        # Print the values to the serial port
        print(
            "Temp: {:.1f} F / {:.1f} C    Humidity: {}% ".format(
                temperature_f, temperature_c, humidity
            )
        )
 
    except RuntimeError as error:
        # Errors happen fairly often, DHT's are hard to read, just keep going
        print(error.args[0])
        sleep(1)
    except Exception as error:
        DHT11.exit()
        raise error
 
    sleep(1)
    
def light():
    value = GPIO.input(LDR)
    if value == 0:
        lcd.lcd_display_string("L:" + "High",1,8)
    else:
        lcd.lcd_display_string("L:" + "LOW ",1,8)
        
#Get the analog input values
def rain():
    bus.write_byte(0x4b,0x84)# A0
    value = bus.read_byte(0x4b)
    value = (value/255) * 100
    value = (value - 100) * -1
    
    value = int(value)
    lcd.lcd_display_string("R:" + str(value) + "% " ,2,8)
            
    
while True:
    TempHumi()
    light()
    rain()