Water Pump Controller

1//FULLY AUTOMATED SMART SYSTEM THAT WORKS WITHOUT HUMAN INTERVENTION
2
3//The  sketch makes an ARDUINO control a pump which cuts off when the overhead tank (OHT)  is full and does not start the pump if the bottom pit is empty.
4//For Level measurement,  the pit and OHT have three sensors in each for three different water levels. The  sensors are magnetic flow switches.
5//The inputs are pulled HIGH with external  1k pull-up resistors as well as internal pull-up resistors. The switch gives a LOW  signal when activated.
6//The system shall reset by watchdog timer if it hangs.  Time-out is 2 seconds.
7//The pump starts automatically if the OHT is fully empty  and stops when OHT is full. It does not start again unless the OHT is fully empty.
8//The  pump starts automatically if OHT is not full and the pit has overflown
9//When  pit red LED is ON (pit empty), pump stops immediately and buzzer rings for 40 seconds  for one time only
10//Status of Pit and OHT level transition variables stored in  internal EEPROM, so that on power-on or reset the status is unchanged
11//Pump  running command variable stored in EEPROM location 0
12
13//OHT
14//When water  level is below 'low' sensor, red LED glows; when water level is below 'mid' sensor,  yellow LED glows; when water level is below 'high' sensor, green LED glows; when  water level reaches 'high' sensor, pump is turned OFF and buzzer is ON
15//Digital  Pin 2: OHT 'low' sensor (pin4 of Atmega8A)
16//Digital Pin 3: OHT 'mid' sensor  (pin5 of Atmega8A)
17//Digital Pin 4: OHT 'high' sensor (pin6 of Atmega8A)
18
19//Digital  Pin 17: OHT red LED (pin26 of Atmega8A)
20//Digital Pin 18: OHT yellow LED (pin27  of Atmega8A)
21//Digital Pin 19: OHT green LED (pin28 of Atmega8A)
22
23
24//PIT
25//When  water level is below 'low' sensor, red LED glows; when water level is below 'mid'  sensor, yellow LED glows; when water level is below 'high' sensor, green LED glows;  when water level reaches 'high' sensor, green LED blinks.
26//Digital Pin 5: PIT  'low' sensor (pin11 of Atmega8A)
27//Digital Pin 6: PIT 'mid' sensor (pin12 of  Atmega8A)
28//Digital Pin 7: PIT 'high' sensor (pin13 of Atmega8A)
29
30//Digital  Pin 14: PIT red LED (pin23 of Atmega8A)
31//Digital Pin 15: PIT yellow LED (pin24  of Atmega8A)
32//Digital Pin 16: PIT green LED (pin25 of Atmega8A)
33
34#include<avr/wdt.h>
35#include<EEPROM.h>
36
37byte  v=EEPROM.read(0);//Pump running command variable
38byte k;
39byte i;
40
41void  setup() {
42  // put your setup code here, to run once:
43k=0;
44
45pinMode(2,  INPUT_PULLUP);//OHT low
46pinMode(3, INPUT_PULLUP);//OHT mid
47pinMode(4, INPUT_PULLUP);//OHT  high
48
49pinMode(5, INPUT_PULLUP);//Pit low
50pinMode(6, INPUT_PULLUP);//Pit  mid
51pinMode(7, INPUT_PULLUP);//Pit high
52
53pinMode(8, OUTPUT);//Relay
54pinMode(9,  OUTPUT);//Buzzer
55pinMode(10, OUTPUT);//Pump running indicator (can be an LED)
56
57pinMode(14,  OUTPUT);//Pit red LED
58pinMode(15, OUTPUT);//Pit amber LED
59pinMode(16, OUTPUT);//Pit  green LED
60
61pinMode(17, OUTPUT);//OHT red LED
62pinMode(18, OUTPUT);//OHT  amber LED
63pinMode(19, OUTPUT);//OHT green LED
64
65wdt_enable(WDTO_2S); //watchdog  timer enabled with 2 seconds timeout
66}
67
68void loop() {
69  // put your  main code here, to run repeatedly:
70
71wdt_reset();
72
73//OHT LEVEL INDICATION
74if(digitalRead(2)==HIGH  && digitalRead(3)==HIGH)//OHT red
75{
76  digitalWrite(17, HIGH);
77  digitalWrite(18,  LOW);
78  digitalWrite(19, LOW);
79}  
80if(digitalRead(2)==LOW && digitalRead(3)==HIGH)//OHT  amber
81{
82  digitalWrite(17, LOW);
83  digitalWrite(18, HIGH);
84  digitalWrite(19,  LOW);
85}
86if(digitalRead(2)==LOW && digitalRead(3)==LOW)//OHT green
87{
88  digitalWrite(17, LOW);
89  digitalWrite(18, LOW);
90  digitalWrite(19, HIGH);
91}
92
93//PIT  LEVEL INDICATION
94if(digitalRead(5)==HIGH && digitalRead(6)==HIGH && digitalRead(7)==HIGH)//PIT  red
95{
96  digitalWrite(14, HIGH);
97  digitalWrite(15, LOW);
98  digitalWrite(16,  LOW);
99}  
100if(digitalRead(5)==LOW && digitalRead(6)==HIGH && digitalRead(7)==HIGH)//PIT  amber
101{
102  digitalWrite(14, LOW);
103  digitalWrite(15, HIGH);
104  digitalWrite(16,  LOW);
105}
106if(digitalRead(5)==LOW && digitalRead(6)==LOW && digitalRead(7)==HIGH)//PIT  green
107{
108  digitalWrite(14, LOW);
109  digitalWrite(15, LOW);
110  digitalWrite(16,  HIGH);
111}
112if(digitalRead(5)==LOW && digitalRead(6)==LOW && digitalRead(7)==LOW)//PIT  overflow
113{
114  digitalWrite(14, LOW);
115  digitalWrite(15, LOW);
116  digitalWrite(16,  HIGH);
117  delay(450);
118  digitalWrite(16, LOW);
119  delay(450);
120}
121
122//Edge  Crossing Algorithm
123if(digitalRead(2)==LOW && digitalRead(4)==LOW)//OHT full
124  {
125    v=1;
126    EEPROM.update(0, v);
127    delay(5);
128  }
129if(digitalRead(2)==HIGH  && digitalRead(4)==HIGH)//OHT fully empty
130  {
131    v=0;
132    EEPROM.update(0,  v);
133    delay(5);
134  } 
135if(digitalRead(7)==LOW && digitalRead(3)==HIGH)//OHT  partially empty and pit overflow
136  {
137    v=0;
138    EEPROM.update(0, v);
139    delay(5);
140  }
141  
142//Pump running logic
143if(digitalRead(5)==HIGH)
144{
145  digitalWrite(8, LOW);//Pump won't run if pit is empty
146  if(k==0)
147  {
148     tone(9, 490);
149     for(i=0;i<80;i++)
150     {
151       wdt_reset();
152       delay(500);
153     }
154     noTone(9);
155  }
156  k=1; 
157}
158
159else
160{
161  
162 if(v==0)
163 {
164   digitalWrite(8, HIGH);//Pump will run if OHT is not  full
165   digitalWrite(10, HIGH);   
166 }
167
168 if(v==1)
169 {
170   digitalWrite(8,  LOW);//Pump won't run if OHT is full
171   digitalWrite(10, LOW);
172 }
173}
174}
175