Plant Monitor

In this project, we detect both light intensity and soil moisture levels, and display them on the I2C LCD1602 . When you feel that the soil moisture is insufficient, you can press the button module to water the potted plant.

Steps

1. In this project, an I2C LCD1602 is used, so it’s necessary to download the relevant libraries to make it work.

   cd ~/
   wget https://github.com/sunfounder/raphael-kit/blob/master/python/LCD1602.py
   

2. Install smbus2 for I2C.

   sudo pip3 install smbus2
   

3. Save the following code to your Raspberry Pi and give it a name, for example, plant_monitor.ty.

   from robot_hat import ADC, Motors, Pin
   import LCD1602
   import time
   import threading
   
   from robot_hat.utils import reset_mcu
   
   reset_mcu()
   time.sleep(.1)
   
   
   # Initialize objects
   light_sensor = ADC(1)
   moisture_sensor = ADC(0)
   motors = Motors()
   button = Pin('D0')
   
   # Thread running flag
   running = True
   
   def init_lcd():
       LCD1602.init(0x27, 1)
       time.sleep(2)
   
   def update_lcd(light_value, moisture_value):
       LCD1602.write(0, 0, 'Light: %d  ' % light_value)
       LCD1602.write(0, 1, 'Moisture: %d  ' % moisture_value)
   
   def read_sensors():
       light_value = light_sensor.read()
       time.sleep(0.2)
       moisture_value = moisture_sensor.read()
       time.sleep(0.2)
       return light_value, moisture_value
   
   def control_motor():
       global running
       while running:
           button_pressed = button.value() == 0
           if button_pressed:
               motors[1].speed(80)
               time.sleep(0.1)
           else:
               motors[1].speed(0)
               time.sleep(0.1)
           time.sleep(0.1)
   
   def setup():
       init_lcd()
   
   def destroy():
       global running
       running = False
       LCD1602.clear()
   
   def loop():
       global running
       while running:
           light_value, moisture_value = read_sensors()
           update_lcd(light_value, moisture_value)
           time.sleep(.2)
   
   if __name__ == '__main__':
       try:
           setup()
           motor_thread = threading.Thread(target=control_motor)
           motor_thread.start()
           loop()
       except KeyboardInterrupt:
           motor_thread.join()  # Wait for motor_thread to finish
           print("Program stopped")
       except Exception as e:
           print("Error:", e)
       finally:
           motors[1].speed(0)
           time.sleep(.1)
           destroy()
           print('end')
   

4. Use the command sudo python3 plant_monitor.ty to run this code.