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IOT Device Codev1
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2022_162-water quality and usage monitoring system
IOT Device Codev1
Commits
e588d651
Commit
e588d651
authored
Oct 08, 2022
by
Amarasiri Munasinghelage Janith Lakshan Rachintha Darmarathne
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e588d651
//Ultrasonic sendor
const
int
pingPin
=
7
;
// Trigger Pin of Ultrasonic Sensor
const
int
echoPin
=
6
;
// Echo Pin of Ultrasonic Sensor
//TDS
#include <EEPROM.h>
#include "GravityTDS.h"
#define TdsSensorPin A0
#define VREF 5.0
#define SCOUNT 30
int
analogBuffer
[
SCOUNT
];
// store the analog value in the array, read from ADC
int
analogBufferTemp
[
SCOUNT
];
int
analogBufferIndex
=
0
;
int
copyIndex
=
0
;
float
averageVoltage
=
0
;
float
tdsValue
=
0
;
float
temperature
=
25
;
//Turbidity
#define sensor_pin A1
int
volt
;
float
voltage
=
0.00
;
float
turbidity
=
0.00
;
float
Vclear
=
2.85
;
// Output voltage to calibrate (with clear water).
int
sensorValue
=
0
;
// median filtering algorithm for TDS calculation
int
getMedianNum
(
int
bArray
[],
int
iFilterLen
){
int
bTab
[
iFilterLen
];
for
(
byte
i
=
0
;
i
<
iFilterLen
;
i
++
)
bTab
[
i
]
=
bArray
[
i
];
int
i
,
j
,
bTemp
;
for
(
j
=
0
;
j
<
iFilterLen
-
1
;
j
++
)
{
for
(
i
=
0
;
i
<
iFilterLen
-
j
-
1
;
i
++
)
{
if
(
bTab
[
i
]
>
bTab
[
i
+
1
])
{
bTemp
=
bTab
[
i
];
bTab
[
i
]
=
bTab
[
i
+
1
];
bTab
[
i
+
1
]
=
bTemp
;
}
}
}
if
((
iFilterLen
&
1
)
>
0
){
bTemp
=
bTab
[(
iFilterLen
-
1
)
/
2
];
}
else
{
bTemp
=
(
bTab
[
iFilterLen
/
2
]
+
bTab
[
iFilterLen
/
2
-
1
])
/
2
;
}
return
bTemp
;
}
long
microsecondsToInches
(
long
microseconds
)
{
return
microseconds
/
74
/
2
;
}
long
microsecondsToCentimeters
(
long
microseconds
)
{
return
microseconds
/
29
/
2
;
}
void
setup
()
{
Serial
.
begin
(
115200
);
pinMode
(
TdsSensorPin
,
INPUT
);
//TDS analog input A0
pinMode
(
sensor_pin
,
INPUT
);
//Turbifity analog input A1
}
void
loop
()
{
//Ultrasonic
long
duration
,
inches
,
cm
;
pinMode
(
pingPin
,
OUTPUT
);
digitalWrite
(
pingPin
,
LOW
);
delayMicroseconds
(
2
);
digitalWrite
(
pingPin
,
HIGH
);
delayMicroseconds
(
10
);
digitalWrite
(
pingPin
,
LOW
);
pinMode
(
echoPin
,
INPUT
);
duration
=
pulseIn
(
echoPin
,
HIGH
);
inches
=
microsecondsToInches
(
duration
);
cm
=
microsecondsToCentimeters
(
duration
);
//TDS
static
unsigned
long
analogSampleTimepoint
=
millis
();
if
(
millis
()
-
analogSampleTimepoint
>
40U
){
//every 40 milliseconds,read the analog value from the ADC
analogSampleTimepoint
=
millis
();
analogBuffer
[
analogBufferIndex
]
=
analogRead
(
TdsSensorPin
);
//read the analog value and store into the buffer
analogBufferIndex
++
;
if
(
analogBufferIndex
==
SCOUNT
){
analogBufferIndex
=
0
;
}
}
static
unsigned
long
printTimepoint
=
millis
();
if
(
millis
()
-
printTimepoint
>
800U
){
printTimepoint
=
millis
();
for
(
copyIndex
=
0
;
copyIndex
<
SCOUNT
;
copyIndex
++
){
analogBufferTemp
[
copyIndex
]
=
analogBuffer
[
copyIndex
];
// read the analog value more stable by the median filtering algorithm, and convert to voltage value
averageVoltage
=
getMedianNum
(
analogBufferTemp
,
SCOUNT
)
*
(
float
)
VREF
/
1024.0
;
}
}
//temperature compensation formula: fFinalResult(25^C) = fFinalResult(current)/(1.0+0.02*(fTP-25.0));
float
compensationCoefficient
=
1.0
+
0.02
*
(
temperature
-
25.0
);
//temperature compensation
float
compensationVoltage
=
averageVoltage
/
compensationCoefficient
;
//convert voltage value to tds value
tdsValue
=
(
133.42
*
compensationVoltage
*
compensationVoltage
*
compensationVoltage
-
255.86
*
compensationVoltage
*
compensationVoltage
+
857.39
*
compensationVoltage
)
*
0.5
;
//Turbidty
sensorValue
=
analogRead
(
sensor_pin
);
voltage
=
sensorValue
*
(
5.000
/
1023.000
);
// Convert analog (0-1023) to voltage (0 - 5V)
turbidity
=
100.00
-
(
voltage
/
Vclear
)
*
100.00
;
// as relative percentage; 0% = clear water;
//Ultrasinic
Serial
.
print
(
"Distance To Water Level : {"
);
Serial
.
print
(
inches
);
Serial
.
print
(
"in, "
);
Serial
.
print
(
cm
);
Serial
.
print
(
"cm }"
);
//TDS output
Serial
.
print
(
" TDS Value: {"
);
Serial
.
print
(
tdsValue
,
0
);
Serial
.
print
(
"ppm }"
);
//Turbidity output
Serial
.
print
(
" Turbidity: "
);
Serial
.
print
(
turbidity
);
Serial
.
print
(
" "
);
if
(
turbidity
<-
28
)
Serial
.
print
(
"Water Very Clean "
);
if
(
turbidity
>=-
28
&&
turbidity
<-
16
)
Serial
.
print
(
"Water Norm Clean "
);
if
(
turbidity
>=-
16
)
Serial
.
print
(
"Water Very Dirty/Outside from water "
);
Serial
.
println
();
delay
(
100
);
}
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