Surendra Shrestha / Automatic Water controller - Files

controller.py
from __future__ import print_function
verbose = True

# Programatic solution to automatic water controller
def nand(i1, i2):
	return not (i1 and i2)

def dprint(msg):
	if(verbose):
		print (msg)

class Controller(object):
	def __init__(self, verbose = False):
	 	self.s1 = False    	 	#For bottom sensor
	 	self.s2 = False  		#For top upper sensor
	 	self.s3 = False 		#For top lower sensor
	 	self.motor = False
	 	self.state = False
	 	self.verbose = verbose

	def setSensors(self, s1, s2, s3):
		self.s1 = s1
		self.s2 = s2
		self.s3 = s3

	def process(self):
		if nand(not(self.s2) , not(self.s3)) == False:
			self.state = True
			dprint("Top tanks is empty so set to filling")

		if nand(self.s1, self.s2) == False:
			self.state = False
			dprint("Top tank is completely filled so set to emptying")

		#Here not is achieved by common input nand gate
		self.motor = not(nand(self.state, self.s1))


 	# Functions related to the Flipflop
	def setFlipflop(self, in1):
		if(in1 == False):	#Negative logic
			self.state = True

	def resetFlipflop(self, in1):
		if(in1 == False):		#Negative Logic
			self.state = False

	def getState(self):
		return self.state

	# Functions for stastistics
	def print_stastistics(self):
		if(not self.verbose):
			return
		print("--------------------------Stastistics---------------------------")
		#First half
		for i in xrange(4):	
			if(self.s1):		#Bottom tank is full
				print("|++++++++|        ",end='')
			else:
				print("|        |        ",end='')

			#if Top tank is full
			if(self.s2):		
				print("|++++++++|")
			else:
				print("|        |")
			
		#Second Half
		for i in xrange(4):		
			if(self.s1):		#Bottom tank is full
				print("|++++++++|        ",end='')
			else:
				print("|        |        ",end='')

			if(self.s3):
				print("|++++++++|")
			else:
				print("|        |")
		print("+--------+        +--------+")
		print("Bottom tank        Top Tank ")

		if(self.motor):
			print("Motor is running.")
		else:
			print("Motor stopped.")

		if(self.state):
			print("Currently tank is filling.")
		else:
			print("Currently tank is emptying")
			dprint("------------------------End of Statistics-----------------------")

def get_bool(prompt):
    while True:
        try:
           return {"true":True,"false":False}[raw_input(prompt).lower()]
        except KeyError:
           print ("Invalid input please enter True or False!")

# Main Loop
if __name__ == "__main__":
	controller = Controller(verbose=True)
	while(raw_input('Press q to quit other to continue: ') != 'q'):
		#Get new sensor values
		s1 = get_bool('Enter value of S1:')
		s2 = get_bool('Enter Value of S2:')
		s3 = get_bool('Enter Value of S3:')

		#Set sensor values
		controller.setSensors(s1, s2, s3)

		#Process the values
		controller.process();

		#Print current statistics
		controller.print_stastistics()