Connected Soil Moisture Sensor

Project in progress

Components and supplies

Arduino 101

Soil Moisture Sensor

Can also use Sparkfun's moisture sensor

Resistor 10k ohm

Pullup for analog input.

About this project

This is a very basic project that connects an analog moisture sensor to an Arduino/Genuino 101 board. The firmware takes measurements every 500ms and stores the value in a BLE characteristic that can be read. Use nRF Connect or write your own BLE code to read the values as they change.

This is one of a few sensors I'm creating for a larger smart home automation concept. Most of them will work in a similar manner, with either an analog or digital value being read and then shared via BLE.

Code

Soil Moisure Sensor Arduino/Genuino 101 CodeArduino

Upload the code to your Arduino/Genuino 101. Use an app like nRF Connect or write your own BLE code to read/receive updated values for the soil moisture sensor.

#include <BLEAttribute.h>
#include <BLECentral.h>
#include <BLECharacteristic.h>
#include <BLECommon.h>
#include <BLEDescriptor.h>
#include <BLEPeripheral.h>
#include <BLEService.h>
#include <BLETypedCharacteristic.h>
#include <BLETypedCharacteristics.h>
#include <BLEUuid.h>
#include <CurieBLE.h>

//Soil sensor analog input pin
const int soilPin = A0;

BLEPeripheral blePeripheral;

//Soil Service and Characteristic - Custom UUID
BLEService soilService("19B10030-E8F2-537E-4F6C-D104768A1214");
BLEIntCharacteristic soilCharacteristic("19B10031-E8F2-537E-4F6C-D104768A1214", BLERead | BLENotify);





void setup() {
  //Set peripheral name and advertised services.
  blePeripheral.setLocalName("SoilSense");
  blePeripheral.setAdvertisedServiceUuid(soilService.uuid());
  blePeripheral.addAttribute(soilService);
  blePeripheral.addAttribute(soilCharacteristic);
  //set initial soil value to 0
  soilCharacteristic.setValue(0);
  //start peripheral
  blePeripheral.begin();
}

void loop() {
  //poll peripheral and read/set value
  blePeripheral.poll();
  int soilValue = analogRead(soilPin);
  Serial.println(soilValue);
  boolean soilChanged = (soilCharacteristic.value() != soilValue);

  if (soilChanged) {
    soilCharacteristic.setValue(soilValue);
  }
  //delay
  delay(500);
 }