Atlas Scientific
Published © CC BY-NC

Aquarium Evaporation Top Off System

A system to automatically compensate water loss in aquariums due to evaporation.

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Aquarium Evaporation Top Off System

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
EZO-PMP™ Basic Kit
Atlas Scientific EZO-PMP™ Basic Kit
×1
Breadboard (generic)
Breadboard (generic)
×1
Male/Male Jumper Wires
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Measuring Cup
Clear Tape

Story

Read more

Schematics

aquarium evaporation top off wiring diagram

Code

aquarium evaporation top off code

C/C++
//This code was written to be easy to understand.
									 
//Modify this code as you see fit.
//This code will output data to the Arduino serial monitor.
//Type commands into the Arduino serial monitor to control the EZO-PMP Embedded Dosing Pump.
//This code was written in the Arduino 1.8.9 IDE
//An Arduino UNO was used to test this code.
//This code was last tested 6/2019

#include <SoftwareSerial.h>                           //we have to include the SoftwareSerial library, or else we can't use it
#define rx 2                                          //define what pin rx is going to be
#define tx 3                                          //define what pin tx is going to be

SoftwareSerial myserial(rx, tx);                      //define how the soft serial port is going to work


String inputstring = "";                              //a string to hold incoming data from the PC
String devicestring = "";                             //a string to hold the data from the Atlas Scientific product
boolean input_string_complete = false;                //have we received all the data from the PC
boolean device_string_complete = false;               //have we received all the data from the Atlas Scientific product
float ml;                                             //used to hold a floating point number that is the volume 



void setup() {                                        //set up the hardware
  Serial.begin(9600);                                 //set baud rate for the hardware serial port_0 to 9600
  myserial.begin(9600);                               //set baud rate for the software serial port to 9600
  inputstring.reserve(10);                            //set aside some bytes for receiving data from the PC
  devicestring.reserve(30);                           //set aside some bytes for receiving data from the Atlas Scientific product
}


void serialEvent() {                                  //if the hardware serial port_0 receives a char
  inputstring = Serial.readStringUntil(13);           //read the string until we see a <CR>
  input_string_complete = true;                       //set the flag used to tell if we have received a completed string from the PC
}


void loop() {                                         //here we go...

  if (input_string_complete == true) {                //if a string from the PC has been received in its entirety
    myserial.print(inputstring);                      //send that string to the Atlas Scientific product
    myserial.print('\r');                             //add a <CR> to the end of the string
    inputstring = "";                                 //clear the string
    input_string_complete = false;                    //reset the flag used to tell if we have received a completed string from the PC
  }

  if (myserial.available() > 0) {                     //if we see that the Atlas Scientific product has sent a character
    char inchar = (char)myserial.read();              //get the char we just received
    devicestring += inchar;                           //add the char to the var called devicestring
    if (inchar == '\r') {                             //if the incoming character is a <CR>
      device_string_complete = true;                  //set the flag
    }
  }

  if (device_string_complete == true) {                           //if a string from the Atlas Scientific product has been received in its entirety
    Serial.println(devicestring);                                 //send that string to the PC's serial monitor
    if (isdigit(devicestring[0]) || devicestring[0]== '-') {      //if the first character in the string is a digit or a "-" sign    
      ml = devicestring.toFloat();                                //convert the string to a floating point number so it can be evaluated by the Arduino   
       }                                                          //in this code we do not use "ml", But if you need to evaluate the ml as a float, this is how it’s done     
    devicestring = "";                                            //clear the string
    device_string_complete = false;                               //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
  }
}

Credits

Atlas Scientific

Atlas Scientific

27 projects • 183 followers
Atlas Scientific specializes in building laboratory grade sensing equipment for robots, appliances, and industrial control systems.

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