Build Instructions

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• 1

  Setting up the Pump

  Attached the pipe of about 8-9 mm thick in diameter to the side outlet of pump. The other end, I attached to a pipe joiner and smaller pipe, that I got from water dispenser. Finally the attached the nozzle which I borrowed from a broken sprayer.  

  For the electronic part, connected the pump to LM293D driver IN pins and a 4xAA battery holder to power pins

  def alarmSprayOn():
              print("In Alarm Spray On ")
              for i in range(8): 
  ##range value depending on capacity of water container
                  GPIO.output(enablePin,True)
                  GPIO.output(in1Pin,False) 
                  GPIO.output(in2Pin,True)
                  time.sleep(3)
              GPIO.output(enablePin,False)    
          
  def alarmSprayOff():
              print("In Alarm Spray Off ")
              GPIO.output(enablePin,False)
              GPIO.output(in1Pin,False)
              GPIO.output(in2Pin,False)

• 2

  Setting up the I2C dispaly for clock

  I'm using the 0.96 inch I2C display. For this to work Adafruit display module is to be downloaded on Pi. 

  This is a good article to get started. 

  I2C display setup with RPi

  After the setup analyze the example codes for working principles. I went through the stats.py and modified it to suit my purpose for clock setup.
  

  And then I coded time display program with output being shown on our I2C display.

  We can choose the font we like by downloading the .ttf files and accessing them by their full path in the font object created.

  font = ImageFont.truetype('/home/pi/Desktop/Test/VerminVibes1989.ttf', 30) # had to put full path to resolve 'OSError: cannot open resource' issue
  def I2C_TimeDisplay():
      def clk_time():
              t = time.localtime()
              current_time = time.strftime("%H:%M:%S", t)
              print(current_time)
              time.sleep(1)
              return current_time 
      try:
  
          while True:
              current_time = clk_time()
              draw.rectangle((0,0,width,height), outline=0, fill=0)
              draw.text((x+14, top+12),  current_time,  font=font, fill=255)
              # Display image.
              disp.image(image)
              disp.display()
  
      except KeyboardInterrupt:
          disp.clear()
          disp.display()
          GPIO.cleanup()

• 3

  Setting up control with Telegram bot

  I first thought of setting up a server to control RPi operations, but later switched to Telegram because it feels more appealing and easy to control by sending messages and iterations can be easier. Bot can bring life to many more cool ideas quickly. We need to clone telepot library for this. This article provides a good walk through of the process.

  Telegram Bot for RPi 

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