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Water Probe with Arduino Uno

Learn about water quality in a fun way! Assemble your own DIY water probe and measure conductivity - the degree of pollution of any liquid.

BeginnerFull instructions provided331
Water Probe with Arduino Uno

Things used in this project

Hardware components

Arduino UNO Wifi Rev.2
Arduino UNO Wifi Rev.2
×1
5x7cm PCB
×1
Chassis mount binding post Solid core wire
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Male headers strips for arduino
×1

Story

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Code

Water probe

C/C++
/*
 Water Conductivity Monitor
 Sketch for an Arduino gadget that measures the electrical
 conductivity of water.
 This example code is based on example code that is in the public domain.
*/
const float ArduinoVoltage = 5.00; // CHANGE THIS FOR 3.3v Arduinos
const float ArduinoResolution = ArduinoVoltage / 1024;
const float resistorValue = 10000.0;
int threshold = 3;
int inputPin = A0;
int ouputPin = A5;
void setup()
{
 Serial.begin(9600);
 pinMode(ouputPin, OUTPUT);
 pinMode(inputPin, INPUT);
}
void loop()
{
 int analogValue=0;
 int oldAnalogValue=1000;
 float returnVoltage=0.0;
 float resistance=0.0;
 double Siemens;
 float TDS=0.0;
 while(((oldAnalogValue-analogValue)>threshold) || (oldAnalogValue<50))
 {
 oldAnalogValue = analogValue;
 digitalWrite( ouputPin, HIGH );
 delay(10); // allow ringing to stop
 analogValue = analogRead( inputPin );
 digitalWrite( ouputPin, LOW );
 }
 Serial.print("Return voltage = ");
 returnVoltage = analogValue *ArduinoResolution;
 Serial.print(returnVoltage);

 Serial.println(" volts");
 Serial.print("That works out to a resistance of ");
 resistance = ((5.00 * resistorValue) / returnVoltage) - resistorValue;
 Serial.print(resistance);
 Serial.println(" Ohms.");
 Serial.print("Which works out to a conductivity of ");
 Siemens = 1.0/(resistance/1000000);
 Serial.print(Siemens);
 Serial.println(" microSiemens.");
 Serial.print("Total Dissolved Solids are on the order of ");
 TDS = 500 * (Siemens/1000);
 Serial.print(TDS);
 Serial.println(" PPM.");
 if (returnVoltage>4.9) Serial.println("Are you sure this isn't metal?");
 delay(5000);
}

Credits

EDUcentrum

EDUcentrum

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