【水耕栽培】Arduino,ESP32でECメーターを作成する①Arduino編

int ECPin= A0;
int ECGround=A1;
int ECPower =A4;

中略

//************Estimates Resistance of Liquid ****************//
digitalWrite(ECPower,HIGH);
raw= analogRead(ECPin);
raw= analogRead(ECPin);// This is not a mistake, First reading will be low beause if charged a capacitor
digitalWrite(ECPower,LOW);

#include <OneWire.h>

// OneWire DS18S20, DS18B20, DS1822 Temperature Example
//
// http://www.pjrc.com/teensy/td_libs_OneWire.html
//
// The DallasTemperature library can do all this work for you!
// https://github.com/milesburton/Arduino-Temperature-Control-Library

OneWire  ds(10);  // on pin 10 (a 4.7K resistor is necessary)

void setup(void) {
  Serial.begin(9600);
}

void loop(void) {
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius, fahrenheit;
  
  if ( !ds.search(addr)) {
    Serial.println("No more addresses.");
    Serial.println();
    ds.reset_search();
    delay(250);
    return;
  }
  
  Serial.print("ROM =");
  for( i = 0; i < 8; i++) {
    Serial.write(' ');
    Serial.print(addr[i], HEX);
  }

  if (OneWire::crc8(addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return;
  }
  Serial.println();
 
  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      Serial.println("  Chip = DS18S20");  // or old DS1820
      type_s = 1;
      break;
    case 0x28:
      Serial.println("  Chip = DS18B20");
      type_s = 0;
      break;
    case 0x22:
      Serial.println("  Chip = DS1822");
      type_s = 0;
      break;
    default:
      Serial.println("Device is not a DS18x20 family device.");
      return;
  } 

  ds.reset();
  ds.select(addr);
  ds.write(0x44, 1);        // start conversion, with parasite power on at the end
  
  delay(1000);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.
  
  present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE);         // Read Scratchpad

  Serial.print("  Data = ");
  Serial.print(present, HEX);
  Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
    Serial.print(data[i], HEX);
    Serial.print(" ");
  }
  Serial.print(" CRC=");
  Serial.print(OneWire::crc8(data, 8), HEX);
  Serial.println();

  // Convert the data to actual temperature
  // because the result is a 16 bit signed integer, it should
  // be stored to an "int16_t" type, which is always 16 bits
  // even when compiled on a 32 bit processor.
  int16_t raw = (data[1] << 8) | data[0];
  if (type_s) {
    raw = raw << 3; // 9 bit resolution default
    if (data[7] == 0x10) {
      // "count remain" gives full 12 bit resolution
      raw = (raw & 0xFFF0) + 12 - data[6];
    }
  } else {
    byte cfg = (data[4] & 0x60);
    // at lower res, the low bits are undefined, so let's zero them
    if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
    else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
    else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
    //// default is 12 bit resolution, 750 ms conversion time
  }
  celsius = (float)raw / 16.0;
  fahrenheit = celsius * 1.8 + 32.0;
  Serial.print("  Temperature = ");
  Serial.print(celsius);
  Serial.print(" Celsius, ");
  Serial.print(fahrenheit);
  Serial.println(" Fahrenheit");
}

  Temperature = 25.00 Celsius, 77.00 Fahrenheit

/*
  ElCheapo Arduino EC-PPM measurments Calibration
 
  This Script is used for calibration of the sensor and fine tuning of the Cell Constant K
  Submerge the sensor and temperature probe in the calibration solution and leave for a while so the temperature probe can settle
  Change the value of the calibration solution to suit the solutiton strength
  Stir the probe to make sure the solution is well mixed and upload the code to the arduino
  Open the terminal for an update of the estimated Cell Constant K [should be around 3] and use this new value in the main EC code.
 
 
  28/8/2015  Michael Ratcliffe  Mike@MichaelRatcliffe.com
 
 
          This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see .
 
    Parts:
    -Arduino - Uno/Mega
    -Standard American two prong plug
    -1 kohm resistor
    -DS18B20 Waterproof Temperature Sensor
 
 
    See www.MichaelRatcliffe.com/Projects for a Pinout and user guide or consult the Zip you got this code from
 
*/
 
 
//************************** Libraries Needed To Compile The Script [See Read me In Download] ***************//
// Both below Library are custom ones [ SEE READ ME In Downloaded Zip If You Dont Know how To install Use them or add a pull up resistor to the temp probe
 
 
#include <OneWire.h>
#include <DallasTemperature.h>
 
 
 
 
 
 
//************************* User Defined Variables ********************************************************//
 
 
float CalibrationEC=1.413; //EC value of Calibration solution is s/cm
 
 
 
 
//##################################################################################
//-----------  Do not Replace R1 with a resistor lower than 300 ohms    ------------
//##################################################################################
 
 
int R1= 1000;
int Ra=25; //Resistance of powering Pins
int ECPin= A0;
int ECGround=A1;
int ECPower =A4;
 
 
//*************Compensating for temperature ************************************//
//The value below will change depending on what chemical solution we are measuring
//0.019 is generaly considered the standard for plant nutrients [google "Temperature compensation EC" for more info
float TemperatureCoef = 0.02; //this changes depending on what chemical we are measuring
 
 
 
 
//************ Temp Probe Related *********************************************//
#define ONE_WIRE_BUS 10          // Data wire For Temp Probe is plugged into pin 10 on the Arduino
const int TempProbePossitive =8;  //Temp Probe power connected to pin 9
const int TempProbeNegative=9;    //Temp Probe Negative connected to pin 8
 
 
 
 
//***************************** END Of Recomended User Inputs *****************************************************************//
 
 
OneWire oneWire(ONE_WIRE_BUS);// Setup a oneWire instance to communicate with any OneWire devices
DallasTemperature sensors(&oneWire);// Pass our oneWire reference to Dallas Temperature.
 
 
float TemperatureFinish=0;
float TemperatureStart=0;
float EC=0;
int ppm =0;
 
 
float raw= 0;
float Vin= 5;
float Vdrop= 0;
float Rc= 0;
float K=0;
 
 
 
 
int i=0;
float buffer=0;
 
 
//*********************************Setup - runs Once and sets pins etc ******************************************************//
void setup()
{
  Serial.begin(9600);
  pinMode(TempProbeNegative , OUTPUT ); //seting ground pin as output for tmp probe
  digitalWrite(TempProbeNegative , LOW );//Seting it to ground so it can sink current
  pinMode(TempProbePossitive , OUTPUT );//ditto but for positive
  digitalWrite(TempProbePossitive , HIGH );
  pinMode(ECPin,INPUT);
  pinMode(ECPower,OUTPUT);//Setting pin for sourcing current
  pinMode(ECGround,OUTPUT);//setting pin for sinking current
  digitalWrite(ECGround,LOW);//We can leave the ground connected permanantly
 
  delay(100);// gives sensor time to settle
  sensors.begin();
  delay(100);
  //** Adding Digital Pin Resistance to [25 ohm] to the static Resistor *********//
  // Consule Read-Me for Why, or just accept it as true
  R1=(R1+Ra);
 
  Serial.println("ElCheapo Arduino EC-PPM measurments Calibration");
  Serial.println("By: Michael Ratcliffe  Mike@MichaelRatcliffe.com");
  Serial.println("Free software: you can redistribute it and/or modify it under GNU ");
  Serial.println("");
  Serial.println("Make sure Probe and Temp Sensor are in Solution and solution is well mixed");
  Serial.println("");
  Serial.println("Starting Calibration: Estimated Time 60 Seconds:");
 
 
 
};
//******************************************* End of Setup **********************************************************************//
 
 
 
 
//************************************* Main Loop - Runs Forever ***************************************************************//
//Moved Heavy Work To subroutines so you can call them from main loop without cluttering the main loop
void loop()
{
 
 
  i=1;
  buffer=0;
sensors.requestTemperatures();// Send the command to get temperatures
TemperatureStart=sensors.getTempCByIndex(0); //Stores Value in Variable
 
 
//************Estimates Resistance of Liquid ****************//
while(i<=10){
 
 
 
digitalWrite(ECPower,HIGH);
raw= analogRead(ECPin);
raw= analogRead(ECPin);// This is not a mistake, First reading will be low
digitalWrite(ECPower,LOW);
buffer=buffer+raw;
i++;
delay(5000);
};
raw=(buffer/10);
 
 
 
 
sensors.requestTemperatures();// Send the command to get temperatures
TemperatureFinish=sensors.getTempCByIndex(0); //Stores Value in Variable
 
 
//*************Compensating For Temperaure********************//
EC =CalibrationEC*(1+(TemperatureCoef*(TemperatureFinish-25.0))) ;
 
//***************** Calculates R relating to Calibration fluid **************************//
Vdrop= (((Vin)*(raw))/1024.0);
Rc=(Vdrop*R1)/(Vin-Vdrop);
Rc=Rc-Ra;
K= 1000/(Rc*EC);
 
 
 
 
Serial.print("Calibration Fluid EC: ");
Serial.print(CalibrationEC);
Serial.print(" S  ");  //add units here
Serial.print("Cell Constant K");
Serial.print(K);
 
 
if (TemperatureStart==TemperatureFinish){
  Serial.println("  Results are Trustworthy");
  Serial.println("  Safe To Use Above Cell Constant in Main EC code");
 
}
else{
  Serial.println("  Error -Wait For Temperature To settle");
 
}
 
 
}
//************************************** End Of Main Loop **********************************************************************//

lCheapo Arduino EC-PPM measurments Calibration
By: Michael Ratcliffe  Mike@MichaelRatcliffe.com
Free software: you can redistribute it and/or modify it under GNU 

Make sure Probe and Temp Sensor are in Solution and solution is well mixed

Starting Calibration: Estimated Time 60 Seconds:
Calibration Fluid EC: 1.41 S  Cell Constant K1.03  Results are Trustworthy
  Safe To Use Above Cell Constant in Main EC code
Calibration Fluid EC: 1.41 S  Cell Constant K1.03  Results are Trustworthy
  Safe To Use Above Cell Constant in Main EC code
Calibration Fluid EC: 1.41 S  Cell Constant K1.03  Error -Wait For Temperature To settle
Calibration Fluid EC: 1.41 S  Cell Constant K1.03  Error -Wait For Temperature To settle

/*
  ElCheapo Arduino EC-PPM measurments
 
  This scrip uses a common USA two prong plug and a 47Kohm Resistor to measure the EC/PPM of a Aquaponics/Hydroponics Sytem.
  You could modift this code to Measure other liquids if you change the resitor and values at the top of the code.
 
  This Program will give you a temperature based feed controller. See Read me in download file for more info.
 
  28/8/2015  Michael Ratcliffe  Mike@MichaelRatcliffe.com
 
 
          This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see .
 
    Parts:
    -Arduino - Uno/Mega
    -Standard American two prong plug
    -1 kohm resistor
    -DS18B20 Waterproof Temperature Sensor
 
    Limitations:
    -
    -
 
    See www.MichaelRatcliffe.com/Projects for a Pinout and user guide or consult the Zip you got this code from
 
*/
 
 
//************************** Libraries Needed To Compile The Script [See Read me In Download] ***************//
// Both below Library are custom ones [ SEE READ ME In Downloaded Zip If You Dont Know how To install] Use them or add a pull up resistor to the temp probe
 
 
#include <OneWire.h>
#include <DallasTemperature.h>
 
 
 
 
 
 
//************************* User Defined Variables ********************************************************//
 
 
//##################################################################################
//-----------  Do not Replace R1 with a resistor lower than 300 ohms    ------------
//##################################################################################
 
 
int R1= 1000;
int Ra=25; //Resistance of powering Pins
int ECPin= A0;
int ECGround=A1;
int ECPower =A4;
 
 
//*********** Converting to ppm [Learn to use EC it is much better**************//
// Hana      [USA]        PPMconverion:  0.5
// Eutech    [EU]          PPMconversion:  0.64
//Tranchen  [Australia]  PPMconversion:  0.7
// Why didnt anyone standardise this?
 
 
float PPMconversion=0.7;
 
 
//*************Compensating for temperature ************************************//
//The value below will change depending on what chemical solution we are measuring
//0.019 is generaly considered the standard for plant nutrients [google "Temperature compensation EC" for more info
float TemperatureCoef = 0.02; //this changes depending on what chemical we are measuring
 
 
 
 
//********************** Cell Constant For Ec Measurements *********************//
//Mine was around 2.9 with plugs being a standard size they should all be around the same
//But If you get bad readings you can use the calibration script and fluid to get a better estimate for K
float K=1.03;
 
 
 
 
//************ Temp Probe Related *********************************************//
#define ONE_WIRE_BUS 10          // Data wire For Temp Probe is plugged into pin 10 on the Arduino
const int TempProbePossitive =8;  //Temp Probe power connected to pin 9
const int TempProbeNegative=9;    //Temp Probe Negative connected to pin 8
 
 
 
 
//***************************** END Of Recomended User Inputs *****************************************************************//
 
 
OneWire oneWire(ONE_WIRE_BUS);// Setup a oneWire instance to communicate with any OneWire devices
DallasTemperature sensors(&oneWire);// Pass our oneWire reference to Dallas Temperature.
 
 
float Temperature=10;
float EC=0;
float EC25 =0;
int ppm =0;
 
 
float raw= 0;
float Vin= 5;
float Vdrop= 0;
float Rc= 0;
float buffer=0;
 
 
 
 
//*********************************Setup - runs Once and sets pins etc ******************************************************//
void setup()
{
  Serial.begin(9600);
  pinMode(TempProbeNegative , OUTPUT ); //seting ground pin as output for tmp probe
  digitalWrite(TempProbeNegative , LOW );//Seting it to ground so it can sink current
  pinMode(TempProbePossitive , OUTPUT );//ditto but for positive
  digitalWrite(TempProbePossitive , HIGH );
  pinMode(ECPin,INPUT);
  pinMode(ECPower,OUTPUT);//Setting pin for sourcing current
  pinMode(ECGround,OUTPUT);//setting pin for sinking current
  digitalWrite(ECGround,LOW);//We can leave the ground connected permanantly
 
  delay(100);// gives sensor time to settle
  sensors.begin();
  delay(100);
  //** Adding Digital Pin Resistance to [25 ohm] to the static Resistor *********//
  // Consule Read-Me for Why, or just accept it as true
  R1=(R1+Ra);// Taking into acount Powering Pin Resitance
 
  Serial.println("ElCheapo Arduino EC-PPM measurments");
  Serial.println("By: Michael Ratcliffe  Mike@MichaelRatcliffe.com");
  Serial.println("Free software: you can redistribute it and/or modify it under GNU ");
  Serial.println("");
  Serial.println("Make sure Probe and Temp Sensor are in Solution and solution is well mixed");
  Serial.println("");
  Serial.println("Measurments at 5's Second intervals [Dont read Ec morre than once every 5 seconds]:");
 
 
};
//******************************************* End of Setup **********************************************************************//
 
 
 
 
//************************************* Main Loop - Runs Forever ***************************************************************//
//Moved Heavy Work To subroutines so you can call them from main loop without cluttering the main loop
void loop()
{
 
 
 
 
GetEC();          //Calls Code to Go into GetEC() Loop [Below Main Loop] dont call this more that 1/5 hhz [once every five seconds] or you will polarise the water
PrintReadings();  // Cals Print routine [below main loop]
 
 
delay(5000);
 
 
}
//************************************** End Of Main Loop **********************************************************************//
 
 
 
 
//************ This Loop Is called From Main Loop************************//
void GetEC(){
 
 
//*********Reading Temperature Of Solution *******************//
sensors.requestTemperatures();// Send the command to get temperatures
Temperature=sensors.getTempCByIndex(0); //Stores Value in Variable
 
 
 
 
//************Estimates Resistance of Liquid ****************//
digitalWrite(ECPower,HIGH);
raw= analogRead(ECPin);
raw= analogRead(ECPin);// This is not a mistake, First reading will be low beause if charged a capacitor
digitalWrite(ECPower,LOW);
 
 
 
 
//***************** Converts to EC **************************//
Vdrop= (Vin*raw)/1024.0;
Rc=(Vdrop*R1)/(Vin-Vdrop);
Rc=Rc-Ra; //acounting for Digital Pin Resitance
EC = 1000/(Rc*K);
 
 
//*************Compensating For Temperaure********************//
EC25  =  EC/ (1+ TemperatureCoef*(Temperature-25.0));
ppm=(EC25)*(PPMconversion*1000);
 
 
;}
//************************** End OF EC Function ***************************//
 
 
 
 
//***This Loop Is called From Main Loop- Prints to serial usefull info ***//
void PrintReadings(){
Serial.print("Rc: ");
Serial.print(Rc);
Serial.print(" EC: ");
Serial.print(EC25);
Serial.print(" Simens  ");
Serial.print(ppm);
Serial.print(" ppm  ");
Serial.print(Temperature);
Serial.println(" *C ");
 
 
/*
//********** Usued for Debugging ************
Serial.print("Vdrop: ");
Serial.println(Vdrop);
Serial.print("Rc: ");
Serial.println(Rc);
Serial.print(EC);
Serial.println("Siemens");
//********** end of Debugging Prints *********
*/
};

ElCheapo Arduino EC-PPM measurments
By: Michael Ratcliffe  Mike@MichaelRatcliffe.com
Free software: you can redistribute it and/or modify it under GNU 

Make sure Probe and Temp Sensor are in Solution and solution is well mixed

Measurments at 5's Second intervals [Dont read Ec morre than once every 5 seconds]:
Rc: 1032.54 EC: 0.78 Simens  543 ppm  24.94 *C 
Rc: 542.72 EC: 1.48 Simens  1033 ppm  24.94 *C 
Rc: 521.26 EC: 1.54 Simens  1075 ppm  24.94 *C 
Rc: 509.58 EC: 1.57 Simens  1100 ppm  24.94 *C 
Rc: 530.72 EC: 1.51 Simens  1056 ppm  24.94 *C 
Rc: 540.30 EC: 1.48 Simens  1037 ppm  24.94 *C 
Rc: 516.57 EC: 1.55 Simens  1085 ppm  24.94 *C 
Rc: 509.58 EC: 1.57 Simens  1100 ppm  24.94 *C 
Rc: 521.26 EC: 1.54 Simens  1075 ppm  24.94 *C 
Rc: 537.90 EC: 1.49 Simens  1042 ppm  24.94 *C 
Rc: 516.57 EC: 1.55 Simens  1085 ppm  24.94 *C 
Rc: 511.90 EC: 1.56 Simens  1095 ppm  24.94 *C 
Rc: 540.30 EC: 1.48 Simens  1037 ppm  24.94 *C 
Rc: 511.90 EC: 1.56 Simens  1095 ppm  24.94 *C 
Rc: 537.90 EC: 1.49 Simens  1042 ppm  24.94 *C 
Rc: 509.58 EC: 1.57 Simens  1100 ppm  24.94 *C 
Rc: 537.90 EC: 1.49 Simens  1042 ppm  24.94 *C 
Rc: 509.58 EC: 1.57 Simens  1100 ppm  24.94 *C 
Rc: 537.90 EC: 1.49 Simens  1042 ppm  24.94 *C 
Rc: 507.27 EC: 1.58 Simens  1105 ppm  24.94 *C 
Rc: 533.11 EC: 1.50 Simens  1051 ppm  24.94 *C 
Rc: 525.98 EC: 1.52 Simens  1066 ppm  24.94 *C 
Rc: 507.27 EC: 1.58 Simens  1105 ppm  24.94 *C 
Rc: 535.50 EC: 1.50 Simens  1047 ppm  24.94 *C 
Rc: 530.72 EC: 1.51 Simens  1056 ppm  24.94 *C 
Rc: 507.27 EC: 1.58 Simens  1105 ppm  24.94 *C 
Rc: 507.27 EC: 1.58 Simens  1105 ppm  24.94 *C 
Rc: 511.90 EC: 1.56 Simens  1095 ppm  24.94 *C 
Rc: 533.11 EC: 1.50 Simens  1051 ppm  24.94 *C 
Rc: 537.90 EC: 1.49 Simens  1042 ppm  24.94 *C 
Rc: 509.58 EC: 1.57 Simens  1100 ppm  24.94 *C 
Rc: 511.90 EC: 1.56 Simens  1095 ppm  24.94 *C 
Rc: 537.90 EC: 1.49 Simens  1042 ppm  24.94 *C