Raspberry Pi, Python and watering indoor plants

Components and Useful Resources

• Raspberry Pi 3 Starter Kit
• Water Pump, 12V
• Power supply, 12V
• Relay, 5V
• Connecting cables
• Cables with crocodile connectors
• Silicone tubes

• How electricity works
• How to use a relay
• Raspberry Pi Relay Power Supply
• Connecting a 12V power supply to a relay

Connect a relay to the Raspberry Pi

Connecting the power supply to the relay

Connecting a water pump to a relay

The code

from gpiozero import OutputDevice

class Relay(OutputDevice):
    def __init__(self, pin, active_high):
        super(Relay, self).__init__(pin, active_high)

import datetime

class TimeKeeper:
    def __init__(self, current_time):
        self.current_time = current_time
        self.time_last_watered = None
    
    def set_current_time(self, updated_time):
        self.current_time = updated_time

    def set_time_last_watered(self, updated_time):
        self.time_last_watered = updated_time

    @staticmethod
    def get_current_time():
        now = datetime.datetime.now()
        return now.strftime("%I:%M:%S %p")

from classes import Hardware
from classes import TimeKeeper as TK
import schedule
import smtplib
import time
import ssl

# WATERING_TIME must be in "00:00:00 PM" format
WATERING_TIME = '11:59:50 AM'
SECONDS_TO_WATER = 10
RELAY = Hardware.Relay(12, False)
EMAIL_MESSAGES = {
    'last_watered': {
        'subject': 'Raspberry Pi: Plant Watering Time',
        'message': 'Your plant was last watered at'
    },
    'check_water_level': {
        'subject': 'Raspberry Pi: Check Water Level',
        'message': 'Check your water level!',
    }
}

def send_email(time_last_watered, subject, message):
    port = 465
    smtp_server = "smtp.gmail.com"
    FROM = TO = "YOUR_EMAIL@gmail.com"
    password = "YOUR_PASSWORD"

    complete_message = ''
    if time_last_watered == False:
        complete_message = "Subject: {}\n\n{}".format(subject, message)
    else:
        complete_message = "Subject: {}\n\n{} {}".format(subject, message, time_last_watered)
    
    context = ssl.create_default_context()
    with smtplib.SMTP_SSL(smtp_server, port, context=context) as server:
        server.login(FROM, password)
        server.sendmail(FROM, TO, complete_message)

def send_last_watered_email(time_last_watered):
    message = EMAIL_MESSAGES['last_watered']['message']
    subject = EMAIL_MESSAGES['last_watered']['subject']
    send_email(time_last_watered, subject, message)

def send_check_water_level_email():
    message = EMAIL_MESSAGES['check_water_level']['message']
    subject = EMAIL_MESSAGES['check_water_level']['subject']
    send_email(False, subject, message)

def water_plant(relay, seconds):
    relay.on()
    print("Plant is being watered!")
    time.sleep(seconds)
    print("Watering is finished!")
    relay.off()

def main():
    time_keeper = TK.TimeKeeper(TK.TimeKeeper.get_current_time())
    if(time_keeper.current_time == WATERING_TIME):
        water_plant(RELAY, SECONDS_TO_WATER)
        time_keeper.set_time_last_watered(TK.TimeKeeper.get_current_time())
        print("\nPlant was last watered at {}".format(time_keeper.time_last_watered))
        # send_last_watered_email(time_keeper.time_last_watered)

# schedule.every().friday.at("12:00").do(send_check_water_level_email)

while True:
    # schedule.run_pending()
    time.sleep(1)
    main()

1. You must enter in the line FROM = TO = «YOUR_EMAIL@gmail.com»and password = «YOUR_PASSWORD»your Gmail email address and password.
2. Uncomment the following lines:
   
   
   •  # send_last_watered_email (time_keeper.time_last_watered)
   • # schedule.every (). friday.at ("12:00"). do (send_check_water_level_email)
   • # schedule.run_pending ()
3. You need to go here , log in to your Gmail account and turn on the switch on this page. Otherwise, when you try to send an email using Gmail, you will receive an error message. 

run
├── classes
│ ├── Hardware.py
│ └── TimeKeeper.py
└── water_plant.py

sudo crontab -e

@reboot python3 /home/pi/Desktop/run/water_plant.py

Summary

git clone https://github.com/AlanConstantino/rpi-plant-project.git