Kareem Crum
Published © GPL3+

Smart House Plant Watering System

Do not be discouraged if you are not a green thumber! Here is a watering system that can account for complex human lifestyles.

BeginnerWork in progress3 days447
Smart House Plant Watering System

Things used in this project

Hardware components

SparkFun Atmospheric Sensor Breakout - BME280
SparkFun Atmospheric Sensor Breakout - BME280
×1
0.96" OLED 64x128 Display Module
ElectroPeak 0.96" OLED 64x128 Display Module
×1
Argon
Particle Argon
×1
Grove - Dust Sensor(PPD42NS)
Seeed Studio Grove - Dust Sensor(PPD42NS)
×1
Grove - Air quality sensor v1.3
Seeed Studio Grove - Air quality sensor v1.3
×1
Gravity: Analog Capacitive Soil Moisture Sensor- Corrosion Resistant
DFRobot Gravity: Analog Capacitive Soil Moisture Sensor- Corrosion Resistant
×1
Relay (generic)
×1
General Purpose Transistor PNP
General Purpose Transistor PNP
×1
Resistor 221 ohm
Resistor 221 ohm
×1
Resistor 2.21k ohm
Resistor 2.21k ohm
×1
DC motor (generic)
×1

Software apps and online services

Fusion 360
Autodesk Fusion 360
Visual Studio Code Extension for Arduino
Microsoft Visual Studio Code Extension for Arduino
Adafruit.io

Hand tools and fabrication machines

Plier, Long Nose
Plier, Long Nose
Plier, Cutting
Plier, Cutting
Plier, Needle Nose
Plier, Needle Nose
Wire Stripper & Cutter, 30-10 AWG Solid & Stranded Wires
Wire Stripper & Cutter, 30-10 AWG Solid & Stranded Wires
10 Pc. Jumper Wire Kit, 5 cm Long
10 Pc. Jumper Wire Kit, 5 cm Long
Breadboard, Plastic
Breadboard, Plastic

Story

Read more

Custom parts and enclosures

Video of the manual operation

The button will be clicked on or off (1,0) which will send a message to the relay to water the plant for as long as the button is on 1!

Schematics

The Fritz for the Smart Watering System

Picture of FRITZ

Code

Water System Code

C/C++
It is a code on Visual Studio Code designed to water the plant automatically when the soil moisture drops beneath 45 %.
/*
 * Project L14_04_PlantWater
 * Description: Getting our plant water the quick way
 * Author: Kareem Crum
 * Date: 19-APR-2021
 */

//#include's
#include <Adafruit_MQTT.h>
#include <SPI.h>
#include <Wire.h>

#include "Adafruit_MQTT/Adafruit_MQTT.h" 
#include "Adafruit_MQTT/Adafruit_MQTT_SPARK.h" 
#include "Adafruit_MQTT/Adafruit_MQTT.h" 
#include "Adafruit_BME280.h"
#include "Adafruit_Sensor.h"
#include "Grove_Air_quality_Sensor.h"

#include "Adafruit_SSD1306.h"
#include "credentials.h"
#include "math.h"

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET    D4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32


//Global State
TCPClient TheClient;

//Adafruit BME class
Adafruit_BME280 bme;

//Grove Air Quality Sensor class
AirQualitySensor sensor(A2);

//Adafruit display class
Adafruit_SSD1306 display(OLED_RESET);

//MQTT client class
Adafruit_MQTT_SPARK mqtt(&TheClient,AIO_SERVER,AIO_SERVERPORT,AIO_USERNAME,AIO_KEY); 

//Feeds
Adafruit_MQTT_Subscribe mqttSub1 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/manuelButton"); 
Adafruit_MQTT_Publish Moist = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/SoilMoisture");
Adafruit_MQTT_Publish Pressure = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/Pressure");
Adafruit_MQTT_Publish Humid = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/Humidity");
Adafruit_MQTT_Publish Temp = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/Temperature");
Adafruit_MQTT_Publish Air = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/AirQuality");
Adafruit_MQTT_Publish Dust = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/DustSensor");

//Variables
const int VALUE1 = 620;
const int VALUE2 = 310;
unsigned long lastMQTT;
unsigned long lastPub;
unsigned long dustTime;
unsigned long duration;
unsigned long waterTime;
unsigned long sampletime_ms = 30000;
unsigned long lowpulseoccupancy = 0;
int dustSensor = A0;
int soilSensor = A1;
int relay = A4;
int soilMoisturePercent; 
int soilMoistureValue; 
int current_quality =-1;
float dustSense;
float airSense;
float tempC;
float humidRH;
float pressPA;
float tempF;
float inHg;
float ratio = 0;
float concentration = 0;
bool buttonState;

SYSTEM_MODE(SEMI_AUTOMATIC);

// setup() runs once, when the device is first turned on.
void setup() 
{
  // Put initialization like pinMode and begin functions here.

  pinMode(soilSensor, INPUT);
  pinMode(dustSensor, INPUT);
  pinMode(relay, OUTPUT);

  Serial.begin(9600);
  bool status;
  status = bme.begin(0x76);
  sensor.init();
  dustTime = millis();
  delay(100); //wait for Serial Monitor to startup

  Serial.printf("Connecting to Internet \n");
  WiFi.connect();
  while(WiFi.connecting()) {
    Serial.printf(".");
    delay(100);
  }
  Serial.printf("\n Connected!!!!!! \n");
  // Setup MQTT subscription for onoff feed.
  mqtt.subscribe(&mqttSub1);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop()
 {

  current_quality=sensor.slope();
  if (current_quality >= 0)// if a valid data returned.
  {
      if (current_quality==0)
          Serial.println("High pollution! Force signal active");
      else if (current_quality==1)
          Serial.println("High pollution!");
      else if (current_quality==2)
          Serial.println("Low pollution!");
      else if (current_quality ==3)
          Serial.println("Fresh air");    
  }

  duration = pulseIn(dustSensor, LOW);
  lowpulseoccupancy = lowpulseoccupancy + duration;
  if ((millis()-dustTime) >= 30000){
    ratio = lowpulseoccupancy/(30000*10.0);
    concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62;
    if(concentration > 1){
      dustSense = concentration;
    }
    Serial.printf("Concentration = %f pcs/0.01cf",dustSense);
    lowpulseoccupancy = 0;
    dustTime = millis();
  }
 

  // Ping MQTT Broker every 2 minutes to keep connection alive
  if ((millis()-lastMQTT)>120000) 
  {
      Serial.printf("Pinging MQTT \n");
      if(! mqtt.ping()) {
        Serial.printf("Disconnecting \n");
        mqtt.disconnect();
      }
      lastMQTT = millis();
  }

  // this is our 'wait for incoming subscription packets' busy subloop
 
  Adafruit_MQTT_Subscribe *subscription;
  while ((subscription = mqtt.readSubscription(1000)))
   {
    if (subscription == &mqttSub1) {
      buttonState = atoi((char *)mqttSub1.lastread);
      Serial.printf("buttonState is %i\n", buttonState);
    }   
  }

  if (buttonState == 1)
  {
      digitalWrite(relay,HIGH);
      Serial.printf("buttonState is on \n");
  }
    else
    {
      digitalWrite(relay,LOW);
      Serial.printf("buttonState is off \n");
    }

  if((millis()-lastPub > 30000)) 
  {
    if(mqtt.Update()) 
    {
      Moist.publish(soilMoisturePercent);
      Air.publish(airSense);
      Temp.publish(tempF);
      Humid.publish(humidRH);
      Dust.publish(dustSense);
      Pressure.publish(inHg);
 
    } 
    lastPub = millis();
  }
  soilMoistureValue = analogRead(soilSensor);
  Serial.printf("Soil moisture is %i\n", soilMoistureValue);
  soilMoisturePercent = map(soilMoistureValue, 1800, 3500, 100, 0);

  tempC = bme.readTemperature();
  tempF = map(tempC,0.0,100.0,32.0,212.0);
  pressPA = bme.readPressure();
  inHg = pressPA/3386.389;
  humidRH = bme.readHumidity();
  airSense = sensor.getValue();
  
  MQTT_connect();
  hydrate();
  OLEDDisplay();
  printValues();
}

// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() 
{
  int8_t ret;
 
  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }
 
  Serial.print("Connecting to MQTT... ");
 
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
       Serial.println(mqtt.connectErrorString(ret));
       Serial.println("Retrying MQTT connection in 5 seconds...");
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
  }
  Serial.println("MQTT Connected!");
}
void hydrate()
{
  if(soilMoisturePercent <= 45)
  {
    if((millis()-waterTime)>10000)
    {
      digitalWrite(relay,HIGH);
      delay(500);
      digitalWrite(relay,LOW);
      waterTime = millis();
    }
  }

}
void OLEDDisplay()
{      
    display.clearDisplay();
    display.setCursor(0,0);  //oled display
    display.setRotation(2);
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.printf("Temp: %0.2f\nHumidity: %0.2f\nDust %0.2f\nPressure: %0.2f\n", tempF, humidRH, dustSense, inHg);
    display.printf("Air: %i\nMoist: %i%%\n", airSense, soilMoisturePercent);
    display.display();
}
void printValues() 
{
    Serial.printf("Temperature = %f\n", tempF);
    Serial.print(bme.readTemperature());
    Serial.println(" *F");
    
    Serial.printf("Pressure = %f\n", inHg);
    Serial.print(bme.readPressure());
    Serial.println(" hPa");

 
    Serial.printf("Humidity = %f\n", humidRH);
    Serial.print(bme.readHumidity());
    Serial.println(" %");

    Serial.println();
}

Credits

Kareem Crum

Kareem Crum

2 projects • 3 followers
Student at the University of New Mexico, taking a deep dive IOT course in order to further expand my skillset.

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