IoT Smart Wormbin

Arduino Code


            /*
            IoT SmartWormbin
            HBKsaar OMTWGR
            Read humidity and temperature of DHT11 sensor
            Read soil moisture of iHaospace
            Send values over serial port
                      
            @author Simon Engel
            @version 0
          */
                      
          #include "DHT.h"          //load DHT library
          #include 
          #define DHTPIN 2          //DHT sensor on pin 2
          #define DHTTYPE DHT11     //DHT11 as DHTTYPE
          
          DHT dht(DHTPIN, DHTTYPE); //call sensor by 'dht'
          SoftwareSerial Bluetooth(10, 11); //instantiate Serial
          float oldHumidity = 0;
          float oldTemperature = 0;
          float oldSoilMoisture = 0;
          
          void setup() {
           Serial.begin(9600);
           Bluetooth.begin(9600);
           dht.begin();            //start DHT11 sensor
          }
          
          void loop() { 
            delay(2000);
            float humidity = dht.readHumidity(); 
                      
            float temperature = dht.readTemperature();
                      
            float soilMoisture = analogRead(A0);
          
            if(oldTemperature - temperature < - 1 || oldTemperature - temperature > 1 ||
               oldHumidity - humidity < - 3 || oldHumidity - humidity > 3 ||
               oldSoilMoisture - soilMoisture < -30 || oldSoilMoisture - soilMoisture > 30 
            ){
            
            Bluetooth.println(humidity);//send values over serial port
            Bluetooth.println(temperature);
            Bluetooth.println(soilMoisture);
          
            oldHumidity = humidity;
            oldTemperature = temperature; 
            oldSoilMoisture = soilMoisture;
            }
                      
           }

Python serial port reader


""" 
   IoT SmartWormbin
   HBKsaar OMTWGR
   Listen to serial port rfcomm0 and write data to csv file
                
   @author Simon Engel
   @version 0
"""
            
import serial, time, csv        #import necessary modules
ser = serial.Serial('dev/rfcomm0')     #Bluetooth binded to rfcomm0 (may vary)
ser.flushInput()
                
while True:
  try:
    humidity = ser.readline()   #read humidity, temperature and moisture
    temperature = ser.readline()
    moisture = ser.readline()
                
    #decode ASCII value, cast to string, remove whitespace using strip
    humidity = str(humidity.decode('ASCII')).strip()
    temperature = str(temperature.decode('ASCII')).strip()
    moisture =str(moisture.decode('ASCII')).strip()
                
    print(humidity)             #printing values for terminal use
    print(temperature)
    print(moisture)
                
    #create timestamp
    localtime = time.asctime(time.localtime(time.time())) 
                
    #create smartWormbin.csv and append data
    with open("smartWormbin.csv", "a", newline='') as f:
      writer = csv.writer(f, delimiter=",")
      writer.writerow([localtime, humidity,temperature,moisture])
  except:
    print("Keyboard Interrupt")
    break

About the Smart Wormbin

Data Visualization

Download the .json or .csv file and get creative

Blueprint

Get all the materials and tools together and start building your own wormbin

Materials

Can be found in your local building supply store

Tools

I bet you know someone, who can help you out

Augmentation

Easy to build, you can find the needed code below

Arduino Schematic

Arduino Code

Python serial port reader

CONTACT