Sump Pit Alarm

Homegrown sump pit monitor with Nagios integration.

May 23, 2018

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12 respects

home automation

security

monitoring

Components and supplies

DHT22 Temperature Sensor

2" PVC pipe

Ultrasonic Sensor - HC-SR04 (Generic)

3 mm LED: Red

Buzzer

Arduino UNO

2" PVC pipe coupling

2" PVC pipe clean-out with lid

3 mm LED: Green

Tools and machines

Wire cutters/stripper

Soldering iron (generic)

Project description

Code

Nagios Plug-in

python

1#!/usr/bin/env python
2
3# $Rev::                         $:  Version  of last commit
4# $Author::                      $:  Author of last commit
5#  $Date::                                                $
6
7import serial
8import  re
9import sys
10
11try:
12    ser = serial.Serial('/dev/ttyACM0', 9600, timeout=15)
13    ser.close()
14    ser.open()
15
16    rawSensorOutput = ser.readline().rstrip('\n')
17
18    x = re.split('\\|', rawSensorOutput)
19
20    temp = float(x[0])
21    hum  = float(x[1])
22    dist = int(x[2])
23
24    if dist >= 31:
25        print  "SUMP PIT OK - %s cm from top; temp - %s, hum - %s" % (dist, temp, hum)
26        sys.exit(0)
27    elif dist <= 30:
28        print "SUMP PIT CRITICAL - %s cm from top; temp  - %s, hum - %s" % (dist, temp, hum)
29        sys.exit(2)
30    else:
31        print  "SUMP PIT UNKNOWN"
32        sys.exit(3)
33
34except (OSError, serial.SerialException):
35    print "SUMP PIT CRITICAL - Cannot open serial port"
36    sys.exit(2)

#!/usr/bin/env python

# $Rev::                         $:  Version  of last commit
# $Author::                      $:  Author of last commit
#  $Date::                                                $

import serial
import  re
import sys

try:
    ser = serial.Serial('/dev/ttyACM0', 9600, timeout=15)
    ser.close()
    ser.open()

    rawSensorOutput = ser.readline().rstrip('\n')

    x = re.split('\\|', rawSensorOutput)

    temp = float(x[0])
    hum  = float(x[1])
    dist = int(x[2])

    if dist >= 31:
        print  "SUMP PIT OK - %s cm from top; temp - %s, hum - %s" % (dist, temp, hum)
        sys.exit(0)
    elif dist <= 30:
        print "SUMP PIT CRITICAL - %s cm from top; temp  - %s, hum - %s" % (dist, temp, hum)
        sys.exit(2)
    else:
        print  "SUMP PIT UNKNOWN"
        sys.exit(3)

except (OSError, serial.SerialException):
    print "SUMP PIT CRITICAL - Cannot open serial port"
    sys.exit(2)

Pit Sensor Code

arduino

1// $Rev::                         $:  Version of last commit
2// $Author::                      $:  Author of last commit
3// $Date::                                                $
4
5#include  <DHT.h>;
6
7// DHT22 sensor setup
8#define DHTPIN 13
9#define DHTTYPE DHT22
10DHT  dht(DHTPIN, DHTTYPE);
11
12// pin setup
13const int trigPin = 7;
14const int  echoPin = 8;
15const int buzzerPin = 9;
16const int redLed = 11;
17const int  greenLed = 12;
18
19//Variables
20float hum;
21float temp;
22long duration;
23int  distance;
24
25void setup() {
26  // HC-SR04
27  pinMode(trigPin, OUTPUT); //  Sets the trigPin as an Output
28  pinMode(echoPin, INPUT); // Sets the echoPin  as an Input
29  // LEDs
30  pinMode(greenLed, OUTPUT);
31  pinMode(redLed, OUTPUT);
32  // Buzzer
33  pinMode(buzzerPin, OUTPUT);
34  //
35  Serial.begin(9600); //  Starts the serial communication
36  dht.begin();
37}
38
39void loop() {
40  // <---------------- HC-SR04 ------------------------->
41  // Clears the trigPin
42  digitalWrite(trigPin, LOW);
43  // 10000ms is 10 seconds
44  // 2000 ms is 2  seconds
45  delay(5000);
46  // Sets the trigPin on HIGH state for 10 micro seconds
47  digitalWrite(trigPin, HIGH);
48  delayMicroseconds(10);
49  digitalWrite(trigPin,  LOW);
50  // Reads the echoPin, returns the sound wave travel time in microseconds
51  duration = pulseIn(echoPin, HIGH);
52  // Calculating the distance in cm
53  distance = duration*0.034/2;
54
55  // <---------------- DHT22 ------------------------->
56  // Read data and store it to variables hum and temp
57  hum = dht.readHumidity();
58  temp = dht.readTemperature();
59  // Print temp and humidity values to serial  monitor
60  // Convert C to F
61  temp = temp * 9/5 + 32;
62  // Output
63  Serial.print(temp);
64  Serial.print("|");
65  Serial.print(hum);
66  Serial.print("|");
67  Serial.println(distance);
68
69  // <-------------- LEDs + buzzer ------------------------>
70  if (distance <=  20)
71    {
72      digitalWrite(redLed, HIGH);
73      digitalWrite(buzzerPin,  HIGH);
74      digitalWrite(greenLed, LOW);
75    }
76  else
77    {
78      digitalWrite(greenLed,  HIGH);
79      digitalWrite(redLed, LOW);
80      digitalWrite(buzzerPin, LOW);
81    }
82}

// $Rev::                         $:  Version of last commit
// $Author::                      $:  Author of last commit
// $Date::                                                $

#include  <DHT.h>;

// DHT22 sensor setup
#define DHTPIN 13
#define DHTTYPE DHT22
DHT  dht(DHTPIN, DHTTYPE);

// pin setup
const int trigPin = 7;
const int  echoPin = 8;
const int buzzerPin = 9;
const int redLed = 11;
const int  greenLed = 12;

//Variables
float hum;
float temp;
long duration;
int  distance;

void setup() {
  // HC-SR04
  pinMode(trigPin, OUTPUT); //  Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin  as an Input
  // LEDs
  pinMode(greenLed, OUTPUT);
  pinMode(redLed, OUTPUT);
  // Buzzer
  pinMode(buzzerPin, OUTPUT);
  //
  Serial.begin(9600); //  Starts the serial communication
  dht.begin();
}

void loop() {
  // <---------------- HC-SR04 ------------------------->
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  // 10000ms is 10 seconds
  // 2000 ms is 2  seconds
  delay(5000);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,  LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance in cm
  distance = duration*0.034/2;

  // <---------------- DHT22 ------------------------->
  // Read data and store it to variables hum and temp
  hum = dht.readHumidity();
  temp = dht.readTemperature();
  // Print temp and humidity values to serial  monitor
  // Convert C to F
  temp = temp * 9/5 + 32;
  // Output
  Serial.print(temp);
  Serial.print("|");
  Serial.print(hum);
  Serial.print("|");
  Serial.println(distance);

  // <-------------- LEDs + buzzer ------------------------>
  if (distance <=  20)
    {
      digitalWrite(redLed, HIGH);
      digitalWrite(buzzerPin,  HIGH);
      digitalWrite(greenLed, LOW);
    }
  else
    {
      digitalWrite(greenLed,  HIGH);
      digitalWrite(redLed, LOW);
      digitalWrite(buzzerPin, LOW);
    }
}

Nagios Plug-in

python

1#!/usr/bin/env python
2
3# $Rev::                         $:  Version
4  of last commit
5# $Author::                      $:  Author of last commit
6#
7  $Date::                                                $
8
9import serial
10import
11  re
12import sys
13
14try:
15    ser = serial.Serial('/dev/ttyACM0', 9600, timeout=15)
16
17    ser.close()
18    ser.open()
19
20    rawSensorOutput = ser.readline().rstrip('\
21')
22
23
24    x = re.split('\\|', rawSensorOutput)
25
26    temp = float(x[0])
27    hum
28  = float(x[1])
29    dist = int(x[2])
30
31    if dist >= 31:
32        print
33  "SUMP PIT OK - %s cm from top; temp - %s, hum - %s" % (dist, temp, hum)
34        sys.exit(0)
35
36    elif dist <= 30:
37        print "SUMP PIT CRITICAL - %s cm from top; temp
38  - %s, hum - %s" % (dist, temp, hum)
39        sys.exit(2)
40    else:
41        print
42  "SUMP PIT UNKNOWN"
43        sys.exit(3)
44
45except (OSError, serial.SerialException):
46
47    print "SUMP PIT CRITICAL - Cannot open serial port"
48    sys.exit(2)

#!/usr/bin/env python

# $Rev::                         $:  Version
  of last commit
# $Author::                      $:  Author of last commit
#
  $Date::                                                $

import serial
import
  re
import sys

try:
    ser = serial.Serial('/dev/ttyACM0', 9600, timeout=15)

    ser.close()
    ser.open()

    rawSensorOutput = ser.readline().rstrip('\
')


    x = re.split('\\|', rawSensorOutput)

    temp = float(x[0])
    hum
  = float(x[1])
    dist = int(x[2])

    if dist >= 31:
        print
  "SUMP PIT OK - %s cm from top; temp - %s, hum - %s" % (dist, temp, hum)
        sys.exit(0)

    elif dist <= 30:
        print "SUMP PIT CRITICAL - %s cm from top; temp
  - %s, hum - %s" % (dist, temp, hum)
        sys.exit(2)
    else:
        print
  "SUMP PIT UNKNOWN"
        sys.exit(3)

except (OSError, serial.SerialException):

    print "SUMP PIT CRITICAL - Cannot open serial port"
    sys.exit(2)

Downloadable files

Pit Sensor Diagram

Wiring connections are missing.

Pit Sensor Diagram

Wiring connections are missing.

Pit Sensor Diagram

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