Another Plant Project
Schematic
Definitions
Blynk Preparation
Loop
Read the data
Display and interpret the data
Interpretation-Table - Range 5V: 0 - 4095
Stay informed
Conclusions
Update 15.09.2017

Published September 8, 2017 © GPL3+

MyPlant-Informer

Stay informed about soil-measurement by using Particle Photon.

BeginnerFull instructions provided1 hour2,201

Things used in this project

Hardware components

Particle Photon

Onion Corporation OLED Expansion

on I2C

SparkFun Soil Moisture Sensor (with Screw Terminals)

2 Plants with 2 Sensors

Breadboard (generic)

with 14 jumpers: 4 for OLE Display and 10 for 2 sensors a 5 pieces.

Software apps and online services

Blynk

Story

Another Plant Project

I have bought different seeds for the autumn, to be able to profit then in the winter time from delicious peppermint taste in the tea. In addition, still seeds of a fig tree, of which I can probably not be reaped so quickly.

seed on window-border

The guide said that the earth was always to be kept moist: one more reason to subject the two plants to the electronic monitoring.

Schematic

The Particle Photon is plugged onto a mini-breadboard, the two humidity sensors from Asia are connected to A0 and A1 via SIGNAL and the OLE display shows the percentages converted in the display connected to:

// I2C wiring  
#define BME_MOSI D0                           // = SDA  
#define BME_SCK D1                            // = SCL

In addition, there is still an estimation whether the earth is completely ok or just need action in case of dryness. This is indicated by Blynk prima on the smartphone.

If you like, you can add a buzzer for an acoustic signaling or IFTTT as a signaling service in case of dryness.

Definitions

#include <Adafruit_SSD1306.h>                 // This #include statement was automatically added by the Particle IDE. 
#include <blynk.h>                            // This #include statement was automatically added by the Particle IDE. 
#define soilMoisturePlant1 A0                 // SIGNAL from Soil Moisture Sensor to INPUT A0 - Plant1: "Minze" 
#define soilMoisturePlant2 A1                 // SIGNAL from Soil Moisture Sensor to INPUT A1 - Plant2: "Feigenbaum" 
String namePlant1 = "Minze";                  // your name of the plants 
String namePlant2 = "Feige"; 
const int threshold_plant1 = 80;              // define when its DRY for Plant1 
const int threshold_plant2 = 75;              // define when its DRY for Plant2        
int baudrate = 9600;                          // Serial Monitor  
const int dry = 4095;                         // presents 100% in case of Spark Core or Particle Photon at A0/A1 if sensor is full dry and also 0 = full wet  
int water1, water2;                           // set to global var 
int value_water_Plant1, value_water_Plant2;   // set to global var 
unsigned long lastmillis = 0;                 // time for interation the loop 
// I2C wiring  
#define BME_MOSI D0                           // = SDA  
#define BME_SCK D1                            // = SCL

Blynk Preparation

The integration of Blynk services is not explained.

// You should get Auth Token in the Blynk App. 
// Go to the Project Settings (nut icon). 
char auth[] = "<< your blynk code here >>"; 
// *********   
WidgetLED led1(V5); 
// *********   
WidgetLED led2(V6);

Blynk App to check if soil crosses your threshold

Loop

Ths loop() is short: calls 2 functions to read and display the data.

void loop() { 
   Blynk.run();     
//    !!! http://docs.blynk.cc/#troubleshooting-flood-error   
//    no delays in loop - DO NEVER in LOOP! 
   if ((millis() - lastmillis) > 1000) { 
       lastmillis = millis(); 
       readData(); 
       displayData(); 
   } 
}

Read the data

Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095.

   // step 1 - read the soil moisture Plant1 
   value_water_Plant1 = analogRead(soilMoisturePlant1);  
   water1 = ((int)((((double)value_water_Plant1/dry)*100.0)));

Display and interpret the data

I have no green thumb and so I have set thresholds quite according to my gut feeling in the definitions. These are checked here using IF/THEN/ELSE IF and corresponding indications are displayed on the display.

Interpretation-Table - Range 5V: 0 - 4095

Example readings:

100 = 2% = wet

400 = 10% = wet

800 = 20% = OK

1000 = 24% = OK

1800 = 44% = OK

3000 = 73% = OK

4000 = 98% = dry

4095 = 100% = dry

Stay informed

Regarding the evaluation, I have been stalled briefly and turned to the Particle community: a short time later it was clear that I was a thought mistake. Important at this point is the use of AND and not OR to check the values.

   // OLE Display init  
	display.setTextSize(2);  // 1 = mini 
	display.setTextColor(WHITE); 
	display.setCursor(0,0); 
	display.clearDisplay(); 
   // Plant1 
  if (water1 <= 30) 
  {  
      display.print(namePlant1); 
      display.print(": "); 
	   display.print(water1); 
	   display.print("%"); 
	   display.println(" > SWIM"); 
	   led1.on();          // on/off 
	   led1.setValue(255); // brightness 
	   Blynk.setProperty(V5, "color", "#12a3c7"); // blue 
  }  
  else if ((water1 > 30) && (water1 <= 80)) // && = AND 
  {  
      display.print(namePlant1); 
      display.print(": "); 
	   display.print(water1); 
	   display.print("%"); 
	   display.println(" > OK"); 
	   led1.on();          // on/off 
	   led1.setValue(255); // brightness 
	   Blynk.setProperty(V5, "color", "#12c727"); // green 
  }  
  else if ((water1 > threshold_plant1) && (water1 <= 100)) // && = AND  
  {  
      display.print(namePlant1); 
      display.print(": "); 
	   display.print(water1); 
	   display.print("%"); 
	   display.println(" > DRY"); 
	   led1.on();          // on/off 
	   led1.setValue(255); // brightness 
	   Blynk.setProperty(V5, "color", "#d3345c"); // red 
  }  
  else  
  {  
      display.println("cant read sensor A0!");  
  }

Conclusions

As soon as the seed has risen, I will keep you informed of the development. I do not expect to come up so quickly with a development: I have only sown until 04.09.17.

Similar projects are recommended unter my account: also with Arduino and more comfortable with a Relay and water pump.

Like my description? You will find more under my account.

Follow me to be notified when I publish new projects!

Here is my Paypal link.

Update 15.09.2017

Since the publication of the article several things have happened, in which I would like to let you participate:

a.) the good news: the first minz seedlings are already visible in the photo

b) the bad news: the sensors, only a few days old, have only detected unusable values > the sensors are simply corroded. What do we do as a hobbyist? We think of a solution of what ends with point c).

c) another good news: by using stainless steel wire I get no more corrosion

This stainless steel wire can not be soldered: therefore I use screw clamps to connect these with the standard jumper. I am ready to fit your order and send you a few. Please tell me the desired quantity and the desired length and your address together with a proof of payment at paypal.

d.) the last good news: I have provided an update that takes into account the threshold limits within the IF / ELSE query. Check version 1.1 out!

e.) Bonus: I have also installed a lower limit for the threshold and the IFTTT service in version 1.2 integrated.

With the bool value "firstfire" I can influence, in which case the IFTTT trigger triggered by the Particle Cloud via Particle. Publish and I would like to be informed. If you forget to install a check, IFTTT fires until the water has actually been watered. In my case I do not work with a time check, eg. after x minutes, but set the trigger by changing the sliders inside the Blynk app and, of course, also in the case of after-watering.

Particle.Publish triggers IFTTT

The thresholds can now be set using the slider to give the Blynk App more dynamics to the requirements of your plants. The OLE display I have thus made obsolete.

Updated Blynk User Interface

// Ingo Lohs
// MyPlant-Informer v1.0, 07.09.2017
// works with Photon v0.7.0-rc.1
// optional: accustic warning if case of DRY with a buzzer 
// optional: ifttt

#include <Adafruit_SSD1306.h>                 // This #include statement was automatically added by the Particle IDE.
#include <blynk.h>                            // This #include statement was automatically added by the Particle IDE.

#define soilMoisturePlant1 A0                 // SIGNAL from Soil Moisture Sensor to INPUT A0 - Plant1: "Minze"
#define soilMoisturePlant2 A1                 // SIGNAL from Soil Moisture Sensor to INPUT A1 - Plant2: "Feigenbaum"
String namePlant1 = "Minze";                  // your name of the plants
String namePlant2 = "Feige";
const int threshold_plant1 = 80;              // define when its DRY for Plant1
const int threshold_plant2 = 75;              // define when its DRY for Plant2       
int baudrate = 9600;                          // Serial Monitor 
const int dry = 4095;                         // presents 100% in case of Spark Core or Particle Photon at A0/A1 if sensor is full dry and also 0 = full wet 
int water1, water2;                           // set to global var
int value_water_Plant1, value_water_Plant2;   // set to global var
unsigned long lastmillis = 0;                 // time for interation the loop
// I2C wiring 
#define BME_MOSI D0                           // = SDA 
#define BME_SCK D1                            // = SCL 

Adafruit_SSD1306 display(-1);

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "<< your blynk code here >>";

// *********  

WidgetLED led1(V5);

// *********  

WidgetLED led2(V6);

// *********  

void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();                   // show splashscreen
  delay(2000);
  display.clearDisplay();              // clears the screen and buffer

  Serial.begin(baudrate);
  while(!Serial);                      // Waiting for Serial connection
  pinMode(soilMoisturePlant1, INPUT);  // Set pin A0
  pinMode(soilMoisturePlant2, INPUT);  // Set pin A1
  
  Blynk.begin(auth);                   // Blynk magic starts here
}

// *********  

void loop() {
    
    Blynk.run();    
    
//    !!! http://docs.blynk.cc/#troubleshooting-flood-error  
//    no delays in loop - DO NEVER in LOOP!
    
    if ((millis() - lastmillis) > 1000) {
        lastmillis = millis();
        readData();
        displayData();
    }
}

// *********  

void readData() {
    // step 1 - read the soil moisture Plant1
    value_water_Plant1 = analogRead(soilMoisturePlant1); 
    water1 = ((int)((((double)value_water_Plant1/dry)*100.0))); //Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095

    // step 2 - read the soil moisture Plant2
    value_water_Plant2 = analogRead(soilMoisturePlant2); 
    water2 = ((int)((((double)value_water_Plant2/dry)*100.0))); //Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095
      
    // Data to Serial Monitor  
    Serial.print("Soil moisture ");
    Serial.print(namePlant1);
    Serial.print(": ");
    Serial.print(water1);
    Serial.print(" %");
    Serial.print(" - Raw value: ");
    Serial.println(value_water_Plant1);

    Serial.print("Soil moisture ");
    Serial.print(namePlant2);
    Serial.print(": ");
    Serial.print(water2);
    Serial.print(" %");
    Serial.print(" - Raw value: ");
    Serial.println(value_water_Plant2);
    
    Serial.println("...next value reading...");
    
    // Data to Blynk  
    Blynk.virtualWrite(V1, water1);
    Blynk.virtualWrite(V2, water2);
    Blynk.virtualWrite(V3, threshold_plant1);
    Blynk.virtualWrite(V4, threshold_plant2);
    
}

// *********

void displayData() {
    // Interpretation-Table
    // Range 5V: 0 - 4095
    // example readings:
    //  100 =   2% = wet
    //  400 =  10% = wet
    //  800 =  20% = OK
    // 1000 =  24% = OK
    // 1800 =  44% = OK
    // 3000 =  73% = OK
    // 4000 =  98% = dry
    // 4095 = 100% = dry
    		   
    // OLE Display init 
	display.setTextSize(2);  // 1 = mini
	display.setTextColor(WHITE);
	display.setCursor(0,0);
	display.clearDisplay();

    // Plant1
 
   if (water1 <= 30)
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > SWIM");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#12a3c7"); // blue
   } 
   else if ((water1 > 30) && (water1 <= 80)) // && = AND
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > OK");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#12c727"); // green
   } 
   else if ((water1 > threshold_plant1) && (water1 <= 100)) // && = AND 
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > DRY");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#d3345c"); // red
   } 
   else 
   { 
       display.println("cant read sensor A0!"); 
   }  
    
   // Plant2
    
   if (water2 <= 30)
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > SWIM");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#12a3c7"); // blue
   } 
   else if ((water2 > 30) && (water2 <= 80)) // && = AND
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > OK");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#12c727"); // green
   } 
   else if ((water2 > threshold_plant2) && (water2 <= 100)) // && = AND 
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > DRY");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#d3345c"); // red
   } 
   else 
   { 
       display.println("cant read sensor A1!"); 
   }  
   
   // Output
   display.display();
}

// Ingo Lohs
// MyPlant-Informer v1.1, 10.09.2017
// works with Photon v0.7.0-rc.1
// v1.1 - Anpassung der IF/ELSE IF mit threshold_plantx als Obergrenze
// optional: accustic warning if case of DRY with a buzzer 
// optional: ifttt

#include <Adafruit_SSD1306.h>                 // This #include statement was automatically added by the Particle IDE.
#include <blynk.h>                            // This #include statement was automatically added by the Particle IDE.

#define soilMoisturePlant1 A0                 // SIGNAL from Soil Moisture Sensor to INPUT A0 - Plant1: "Minze"
#define soilMoisturePlant2 A1                 // SIGNAL from Soil Moisture Sensor to INPUT A1 - Plant2: "Feigenbaum"
String namePlant1 = "Minze";                  // your name of the plants
String namePlant2 = "Feige";
const int threshold_plant1 = 80;              // define when its DRY for Plant1
const int threshold_plant2 = 75;              // define when its DRY for Plant2       
int baudrate = 9600;                          // Serial Monitor 
const int dry = 4095;                         // presents 100% in case of Spark Core or Particle Photon at A0/A1 if sensor is full dry and also 0 = full wet 
int water1, water2;                           // set to global var
int value_water_Plant1, value_water_Plant2;   // set to global var
unsigned long lastmillis = 0;                 // time for interation the loop
// I2C wiring 
#define BME_MOSI D0                           // = SDA 
#define BME_SCK D1                            // = SCL 

Adafruit_SSD1306 display(-1);

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "<<< your code here >>>";

// *********  

WidgetLED led1(V5);

// *********  

WidgetLED led2(V6);

// *********  

void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();                   // show splashscreen
  delay(2000);
  display.clearDisplay();              // clears the screen and buffer

  Serial.begin(baudrate);
  while(!Serial);                      // Waiting for Serial connection
  pinMode(soilMoisturePlant1, INPUT);  // Set pin A0
  pinMode(soilMoisturePlant2, INPUT);  // Set pin A1
  
  Blynk.begin(auth);                   // Blynk magic starts here
}

// *********  

void loop() {
    
    Blynk.run();    
    
//    !!! http://docs.blynk.cc/#troubleshooting-flood-error  
//    no delays in loop - DO NEVER in LOOP!
    
    if ((millis() - lastmillis) > 1000) {
        lastmillis = millis();
        readData();
        displayData();
    }
}

// *********  

void readData() {
    // step 1 - read the soil moisture Plant1
    value_water_Plant1 = analogRead(soilMoisturePlant1); 
    water1 = ((int)((((double)value_water_Plant1/dry)*100.0))); //Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095

    // step 2 - read the soil moisture Plant2
    value_water_Plant2 = analogRead(soilMoisturePlant2); 
    water2 = ((int)((((double)value_water_Plant2/dry)*100.0))); //Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095
      
    // Data to Serial Monitor  
    Serial.print("Soil moisture ");
    Serial.print(namePlant1);
    Serial.print(": ");
    Serial.print(water1);
    Serial.print(" %");
    Serial.print(" - Raw value: ");
    Serial.println(value_water_Plant1);

    Serial.print("Soil moisture ");
    Serial.print(namePlant2);
    Serial.print(": ");
    Serial.print(water2);
    Serial.print(" %");
    Serial.print(" - Raw value: ");
    Serial.println(value_water_Plant2);
    
    Serial.println("...next value reading...");
    
    // Data to Blynk  
    Blynk.virtualWrite(V1, water1);
    Blynk.virtualWrite(V2, water2);
    Blynk.virtualWrite(V3, threshold_plant1);
    Blynk.virtualWrite(V4, threshold_plant2);
    
}

// *********

void displayData() {
    // Interpretation-Table
    // Range 5V: 0 - 4095
    // example readings:
    //  100 =   2% = wet
    //  400 =  10% = wet
    //  800 =  20% = OK
    // 1000 =  24% = OK
    // 1800 =  44% = OK
    // 3000 =  73% = OK
    // 4000 =  98% = dry
    // 4095 = 100% = dry
    		   
    // OLE Display init 
	display.setTextSize(2);  // 1 = mini
	display.setTextColor(WHITE);
	display.setCursor(0,0);
	display.clearDisplay();

    // Plant1
 
   if (water1 <= 30)
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > SWIM");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#12a3c7"); // blue
   } 
   else if ((water1 > 30) && (water1 <= threshold_plant1)) // && = AND
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > OK");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#12c727"); // green
   } 
   else if ((water1 > threshold_plant1) && (water1 <= 100)) // && = AND 
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > DRY");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#d3345c"); // red
   } 
   else 
   { 
       display.println("cant read sensor A0!"); 
   }  
    
   // Plant2
    
   if (water2 <= 30)
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > SWIM");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#12a3c7"); // blue
   } 
   else if ((water2 > 30) && (water2 <= threshold_plant2)) // && = AND
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > OK");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#12c727"); // green
   } 
   else if ((water2 > threshold_plant2) && (water2 <= 100)) // && = AND 
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > DRY");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#d3345c"); // red
   } 
   else 
   { 
       display.println("cant read sensor A1!"); 
   }  
   
   // Output
   display.display();
}

// Ingo Lohs
// MyPlant-Informer v1.1, 10.09.2017
// works with Photon v0.7.0-rc.1
// v1.1 - Anpassung der IF/ELSE IF mit threshold_plantx als Obergrenze
// v1.2 - Anpassung auch an eine Untergrenze als Schwellwert - allerdings ohne Berücksichtigung in der Blynk App - hier können nur 4 Linien im Graph-Widget angezeigt werden
// v1.2 - Einbindung des IFTTT-Services: mit Änderung des Schwellwertes innerhalb der Blynk-App mit den Slidern oder sobald wieder gegossen wurde und die Werte sich normalisieren,
//        setzt sich der Trigger 'firstfire' zurück.

// optional: accustic warning if case of DRY with a buzzer 


#include <Adafruit_SSD1306.h>                 // This #include statement was automatically added by the Particle IDE.
#include <blynk.h>                            // This #include statement was automatically added by the Particle IDE.

#define soilMoisturePlant1 A0                 // SIGNAL from Soil Moisture Sensor to INPUT A0 - Plant1: "Minze"
#define soilMoisturePlant2 A1                 // SIGNAL from Soil Moisture Sensor to INPUT A1 - Plant2: "Feigenbaum"
String namePlant1 = "Minze";                  // your name of the plants
String namePlant2 = "Feige";
int threshold_plant1_max = 80;                // define when its DRY for Plant1
int threshold_plant2_max = 75;                // define when its DRY for Plant2       
int threshold_plant1_min = 30;                // define when its WET for Plant1
int threshold_plant2_min = 25;                // define when its WET for Plant2       

bool firstfire_plant1 = true;                 // IFTTT Trigger
bool firstfire_plant2 = true;                 // IFTTT Trigger

int baudrate = 9600;                          // Serial Monitor 
const int dry = 4095;                         // presents 100% in case of Spark Core or Particle Photon at A0/A1 if sensor is full dry and also 0 = full wet 
int water1, water2;                           // set to global var
int value_water_Plant1, value_water_Plant2;   // set to global var
unsigned long lastmillis = 0;                 // time for interation the loop
// I2C wiring 
#define BME_MOSI D0                           // = SDA 
#define BME_SCK D1                            // = SCL 

Adafruit_SSD1306 display(-1);

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "b3dd41cd69144053a19fb573db13e0d7";

#define threshold_plant1_maxSlider V7
#define threshold_plant2_maxSlider V8

// *********  

WidgetLED led1(V5);

// *********  

WidgetLED led2(V6);

// *********  

BLYNK_WRITE(threshold_plant1_maxSlider)     // Blynk app WRITES Slider widget (0...100) 
{
threshold_plant1_max = param.asInt();
firstfire_plant1 = true; // Update IFTTT
}

// *********    

BLYNK_WRITE(threshold_plant2_maxSlider)     // Blynk app WRITES Slider widget (0...100) 
{
threshold_plant2_max = param.asInt();
firstfire_plant2 = true; // Update IFTTT
}

// *********    

void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();                   // show splashscreen
  delay(2000);
  display.clearDisplay();              // clears the screen and buffer

  Serial.begin(baudrate);
  while(!Serial);                      // Waiting for Serial connection
  pinMode(soilMoisturePlant1, INPUT);  // Set pin A0
  pinMode(soilMoisturePlant2, INPUT);  // Set pin A1
  
  Blynk.begin(auth);                   // Blynk magic starts here
}

// *********  

void loop() {
    
    Blynk.run();    
    
//    !!! http://docs.blynk.cc/#troubleshooting-flood-error  
//    no delays in loop - DO NEVER in LOOP!
    
    if ((millis() - lastmillis) > 1000) {
        lastmillis = millis();
        readData();
        displayData();
        updateThreshold();
    }
}

// *********  

void readData() {
    // step 1 - read the soil moisture Plant1
    value_water_Plant1 = analogRead(soilMoisturePlant1); 
    water1 = ((int)((((double)value_water_Plant1/dry)*100.0))); //Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095

    // step 2 - read the soil moisture Plant2
    value_water_Plant2 = analogRead(soilMoisturePlant2); 
    water2 = ((int)((((double)value_water_Plant2/dry)*100.0))); //Convert Raw value to percentage. This is a generic calculation, depending on raw values from 0 to 4095
      
    // Data to Serial Monitor  
    Serial.print("Soil moisture ");
    Serial.print(namePlant1);
    Serial.print(": ");
    Serial.print(water1);
    Serial.print(" %");
    Serial.print(" - Raw value: ");
    Serial.println(value_water_Plant1);

    Serial.print("Soil moisture ");
    Serial.print(namePlant2);
    Serial.print(": ");
    Serial.print(water2);
    Serial.print(" %");
    Serial.print(" - Raw value: ");
    Serial.println(value_water_Plant2);
    
    Serial.println("...next value reading...");
    
    // Data to Blynk  
    Blynk.virtualWrite(V1, water1);
    Blynk.virtualWrite(V2, water2);
    Blynk.virtualWrite(V3, threshold_plant1_max);
    Blynk.virtualWrite(V4, threshold_plant2_max);
//    Blynk.virtualWrite(V5, threshold_plant1_min);
//    Blynk.virtualWrite(V6, threshold_plant2_min);
    
}

// *********

void displayData() {
    // Interpretation-Table
    // Range 5V: 0 - 4095
    // example readings:
    //  100 =   2% = wet
    //  400 =  10% = wet
    //  800 =  20% = OK
    // 1000 =  24% = OK
    // 1800 =  44% = OK
    // 3000 =  73% = OK
    // 4000 =  98% = dry
    // 4095 = 100% = dry
    		   
    // OLE Display init 
	display.setTextSize(2);  // 1 = mini
	display.setTextColor(WHITE);
	display.setCursor(0,0);
	display.clearDisplay();

    // Plant1
 
   if (water1 <= threshold_plant1_min)
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > SWIM");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#12a3c7"); // blue
	   firstfire_plant1 = true;
	   Blynk.virtualWrite(V9, "Swimming");
   } 
   else if ((water1 > threshold_plant1_min) && (water1 <= threshold_plant1_max)) // && = AND
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > OK");
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#12c727"); // green
	   firstfire_plant1 = true;
	   Blynk.virtualWrite(V9, "> OK");
   } 
   else if ((water1 > threshold_plant1_max) && (water1 <= 100) && (firstfire_plant1 == true)) // IFTTT first fire
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > DRY");
	   
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#d3345c"); // red
	   
	   // Particle Cloud > IFTTT
	   Particle.publish("myPlant-Informer", "Alert - Plant is DRY!", PRIVATE);
       firstfire_plant1 = false;
       Blynk.virtualWrite(V9, "> DRY");
   } 
   else if ((water1 > threshold_plant1_max) && (water1 <= 100) && (firstfire_plant1 == false)) // IFTTT next loop
   { 
       display.print(namePlant1);
       display.print(": ");
	   display.print(water1);
	   display.print("%");
	   display.println(" > DRY...");
	   
	   led1.on();          // on/off
	   led1.setValue(255); // brightness
	   Blynk.setProperty(V5, "color", "#d3345c"); // red
       firstfire_plant1 = false;
       Blynk.virtualWrite(V9, "> DRY...");
   } 
   else 
   { 
       display.println("cant read sensor A0!"); 
       Blynk.virtualWrite(V9, "> A0 error");
   }  
 
   // Plant2
    
   if (water2 <= threshold_plant2_min)
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > SWIM");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#12a3c7"); // blue
	   firstfire_plant2 = true;
	   Blynk.virtualWrite(V10, "Swimming");
   } 
   else if ((water2 > threshold_plant2_min) && (water2 <= threshold_plant2_max)) // && = AND
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > OK");
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#12c727"); // green
	   firstfire_plant2 = true;
	   Blynk.virtualWrite(V10, "> OK");
   } 
   else if ((water2 > threshold_plant2_max) && (water2 <= 100) && (firstfire_plant2 == true)) // IFTTT first fire
   { 
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > DRY");
	   
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#d3345c"); // red
	   
	   // Particle Cloud > IFTTT
	   Particle.publish("myPlant-Informer", "Alert - Plant is DRY!", PRIVATE);
       firstfire_plant2 = false;
       Blynk.virtualWrite(V10, "> DRY");
   } 
   else if ((water2 > threshold_plant2_max) && (water2 <= 100) && (firstfire_plant2 == false)) // IFTTT next loop
   {
       display.print(namePlant2);
       display.print(": ");
	   display.print(water2);
	   display.print("%");
	   display.println(" > DRY...");
	   
	   led2.on();          // on/off
	   led2.setValue(255); // brightness
	   Blynk.setProperty(V6, "color", "#d3345c"); // red
	   firstfire_plant2 = false;
	   Blynk.virtualWrite(V10, "> DRY...");
   }
   else 
   { 
       display.println("cant read sensor A1!"); 
       Blynk.virtualWrite(V10, "> A1 error");
   }  
   
   // Output
   display.display();
}

// *********

void updateThreshold() {
    Blynk.virtualWrite(V3, threshold_plant1_max);
    Blynk.virtualWrite(V4, threshold_plant2_max);
}

Credits

Ingo Lohs

182 projects • 194 followers

I am well over 50 years and come from the middle of Germany.

Thanks to Maker Media GmbH.