eCO-SENSE
Published

eCO-SENSE: Soil Sensors Powered by Plant Photosynthesis

We aim to provide a low-cost precision agriculture solution powered by biophotovoltaics, and we start with developing a prototype.

IntermediateWork in progress5,745
eCO-SENSE: Soil Sensors Powered by Plant Photosynthesis

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
Jumper wires (generic)
Jumper wires (generic)
×1
DHT22 Temperature and Humidity Sensor
DFRobot DHT22 Temperature and Humidity Sensor
×1
Adafruit SGP30 TVOC/eCO2 Gas Sensor
×1
Adafruit Bluefruit LE - Bluetooth Low Energy (BLE 4.0) - nRF8001 Breakout - v1.0
×1
Breadboard (generic)
Breadboard (generic)
×1
FC-28 Moisture Sensor
×1

Software apps and online services

Arduino IDE
Arduino IDE
Adafruit Bluefruit LE Connect Version 3.4.1

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Schematics

eCOSENSE schematic

Code

eCO-SENSE Example Arduino Sketch

Arduino
/*********************************************************************
This is an example for our nRF8001 Bluetooth Low Energy Breakout

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/products/1697

Adafruit invests time and resources providing this open source code, 
please support Adafruit and open-source hardware by purchasing 
products from Adafruit!

Written by Kevin Townsend/KTOWN  for Adafruit Industries.
MIT license, check LICENSE for more information
All text above, and the splash screen below must be included in any redistribution
*********************************************************************/

// This version uses the internal data queing so you can treat it like Serial (kinda)!

#include <SPI.h>
#include "Adafruit_BLE_UART.h"
#include <math.h>
#include <Wire.h>
#include "Adafruit_SGP30.h"
#include <DHT.h>;


// Connect CLK/MISO/MOSI to hardware SPI
// e.g. On UNO & compatible: CLK = 13, MISO = 12, MOSI = 11
#define ADAFRUITBLE_REQ 10
#define ADAFRUITBLE_RDY 2     // This should be an interrupt pin, on Uno thats #2 or #3
#define ADAFRUITBLE_RST 9

Adafruit_BLE_UART BTLEserial = Adafruit_BLE_UART(ADAFRUITBLE_REQ, ADAFRUITBLE_RDY, ADAFRUITBLE_RST);

/*     ---------------------------------------------------------
 *     |  Arduino Experimentation Kit Example Code             |
 *     |  CIRC-10 .: Temperature :. (TMP36 Temperature Sensor) |
 *     ---------------------------------------------------------
 *   
 *  A simple program to output the current temperature to the IDE's debug window 
 * 
 *  For more details on this circuit: http://tinyurl.com/c89tvd 
 */
Adafruit_SGP30 sgp;

// Moisture Variables
int sensor_pin = A2;
int moisture;

// DHT22 Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino


//DHT 22 Variables
int chk;
float hum;  //Stores humidity value
float temp; //Stores temperature value

/*
 * setup() - this function runs once when you turn your Arduino on
 * We initialize the serial connection with the computer
 */


/*
 * getVoltage() - returns the voltage on the analog input defined by
 * pin
 */
/**************************************************************************/
/*!
    Configure the Arduino and start advertising with the radio
*/
/**************************************************************************/
void setup(void)
{ 
  Serial.begin(9600);
  while(!Serial); // Leonardo/Micro should wait for serial init
  Serial.println(F("Adafruit Bluefruit Low Energy nRF8001 Print echo demo"));

  BTLEserial.begin();

  Serial.println("SGP30 test");

  if (! sgp.begin()){
    Serial.println("Sensor not found :(");
    while (1);
  }
  Serial.print("Found SGP30 serial #");
  Serial.print(sgp.serialnumber[0], HEX);
  Serial.print(sgp.serialnumber[1], HEX);
  Serial.println(sgp.serialnumber[2], HEX);

  // If you have a baseline measurement from before you can assign it to start, to 'self-calibrate'
  //sgp.setIAQBaseline(0x8E68, 0x8F41);  // Will vary for each sensor!
  dht.begin();
}

/**************************************************************************/
/*!
    Constantly checks for new events on the nRF8001
*/
/**************************************************************************/
aci_evt_opcode_t laststatus = ACI_EVT_DISCONNECTED;

int counter = 0;
void loop()
{ 
  // temperature and humidity stuff from DHT22

  delay(1000);
  //Read data and store it to variables hum and temp
  hum = dht.readHumidity();
  temp= dht.readTemperature();
  //Print temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum);
  Serial.print(" %, Temp: ");
  Serial.print(temp);
  Serial.println(" Celsius");

  //moisture stuff from the moisture sensor
  moisture = analogRead(2);
  Serial.print(moisture);

  //moisture measurements must be calibrated: in this case, we measured 1030 for dry, and 400 for wet soil, and the output will be a percentage
  moisture = map(moisture,1030,400,0,100);

  //gas measurements from the sgp30 gas sensor
  if (! sgp.IAQmeasure()) {
    Serial.println("Measurement failed");
    return;
  }
  Serial.print("TVOC "); Serial.print(sgp.TVOC); Serial.print(" ppb\t");
  Serial.print("eCO2 "); Serial.print(sgp.eCO2); Serial.println(" ppm");

  if (! sgp.IAQmeasureRaw()) {
    Serial.println("Raw Measurement failed");
    return;
  }
  Serial.print("Raw H2 "); Serial.print(sgp.rawH2); Serial.print(" \t");
  Serial.print("Raw Ethanol "); Serial.print(sgp.rawEthanol); Serial.println("");
 
  delay(1000);

  counter++;
  if (counter == 30) {
    counter = 0;

    uint16_t TVOC_base, eCO2_base;
    if (! sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) {
      Serial.println("Failed to get baseline readings");
      return;
    }
    Serial.print("****Baseline values: eCO2: 0x"); Serial.print(eCO2_base, HEX);
    Serial.print(" & TVOC: 0x"); Serial.println(TVOC_base, HEX);
  }
  
  // Tell the nRF8001 to do whatever it should be working on.
  BTLEserial.pollACI();

  // Ask what is our current status
  aci_evt_opcode_t status = BTLEserial.getState();
  // If the status changed....
  if (status != laststatus) {
    // print it out!
    if (status == ACI_EVT_DEVICE_STARTED) {
        Serial.println(F("* Advertising started"));
    }
    if (status == ACI_EVT_CONNECTED) {
        Serial.println(F("* Connected!"));
    }
    if (status == ACI_EVT_DISCONNECTED) {
        Serial.println(F("* Disconnected or advertising timed out"));
    }
    // OK set the last status change to this one
    laststatus = status;
  }

  if (status == ACI_EVT_CONNECTED) {
    // Lets see if there's any data for us!
    if (BTLEserial.available()) {
      Serial.print("* "); Serial.print(BTLEserial.available()); Serial.println(F(" bytes available from BTLE"));
    }
    // OK while we still have something to read, get a character and print it out
    while (BTLEserial.available()) {
      char c = BTLEserial.read();
      Serial.print(c);
    }

    // Next up, see if we have any data to get from the Serial console

//    if (Serial.available()) {
      // Read a line from Serial
      String s = String( String(temp) + "," + String(sgp.eCO2) + "," + String(moisture) + "," + String(hum) + "\n");
      
      
      // We need to convert the line to bytes, no more than 20 at this time
      uint8_t sendbuffer[20];
      s.getBytes(sendbuffer, 20);
      char sendbuffersize = min(20, s.length());

      Serial.print(F("\n* Sending -> \"")); Serial.print((char *)sendbuffer); Serial.println("\"");

      // write the data
      BTLEserial.write(sendbuffer, sendbuffersize);

      

//    }
  }
  delay(1000);
}

Credits

eCO-SENSE

eCO-SENSE

1 project • 6 followers
Empowering Farmers with Soil Sensing Infrastructure

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