Hi All, I am building a small project for my kids, i am using the analogue moisture soil sensor and i have this working ok. (i know there are many of these projects but they all seem to use the digital interface board).
I have a 4 channel relay which i can get to work on its own but i am struggling with reading the analog value and have it turning on a relay. If i can get this to work i can incorporate other things thanks in advance paul.
/* Soil Mositure Basic Example
This sketch was written by SparkFun Electronics
Joel Bartlett
August 31, 2015
Basic skecth to print out soil moisture values to the Serial Monitor
Released under the MIT License(The MIT License – Open Source Initiative)
*/
int val = 0; //value for storing moisture value
int soilPin = A0;//Declare a variable for the soil moisture sensor
int soilPower = 7;//Variable for Soil moisture Power
//Rather than powering the sensor through the 3.3V or 5V pins,
//we'll use a digital pin to power the sensor. This will
//prevent corrosion of the sensor as it sits in the soil.
// define names for the 4 Digital pins On the Arduino
// These data pins link to 4 Relay board pins IN1, IN2, IN3,IN4
#define RELAY1 3
#define RELAY2 4
#define RELAY3 5
#define RELAY4 6
void setup()
{
Serial.begin(9600); // open serial over USB
pinMode(soilPower, OUTPUT);//Set D7 as an OUTPUT
digitalWrite(soilPower, LOW);//Set to LOW so no power is flowing through the sensor
}
void loop()
{
// Initialise the Arduino data pins for OUTPUT
pinMode(RELAY1, OUTPUT);
pinMode(RELAY2, OUTPUT);
pinMode(RELAY3, OUTPUT);
pinMode(RELAY4, OUTPUT);
Serial.print("Soil Moisture = ");
//get soil moisture value from the function below and print it
Serial.println(readSoil());
//This 1 second timefrme is used so you can test the sensor and see it change in real-time.
//For in-plant applications, you will want to take readings much less frequently.
delay(1000);//take a reading every second
}
//This is a function used to get the soil moisture content
int readSoil()
{
digitalWrite(soilPower, HIGH);//turn D7 "On"
delay(10);//wait 10 milliseconds
val = analogRead(soilPin);//Read the SIG value form sensor
digitalWrite(soilPower, LOW);//turn D7 "Off"
return val;//send current moisture value
}
