garden sensor prototype - arduino code

garden.ino

#define lightPin A0
#define tempPin A1
#define yLED 2
#define rLED 3
#define rLED2 4
#define voltageFlipPin1 6
#define voltageFlipPin2 5
#define moistSensorPin A2

int flipTimer = 300;
int currentLight;
int currentTemp;
int currentMoist;

void setup() {
  pinMode(lightPin, INPUT);
  pinMode(tempPin, INPUT);
  pinMode(yLED, OUTPUT);
  pinMode(rLED, OUTPUT);
  pinMode(rLED2, OUTPUT);
  pinMode(voltageFlipPin1, OUTPUT);
  pinMode(voltageFlipPin2, OUTPUT);
  pinMode(moistSensorPin, INPUT);
  Serial.begin(115200);
}

//
// TEMP SENSOR FUNCTIONS
//

// learn.adafruit.com
float getTempF () {
  int reading = analogRead(tempPin);  
  float voltage = reading * 5.0;
  voltage /= 1024.0; 
  float temperatureC = (voltage - 0.5) * 100 ;  //converting from 10 mv per degree wit 500 mV offset to degrees
   float temperatureF = (temperatureC * 1.8) + 32.0;
  return temperatureF;
}

//
// MOISTURE SENSOR FUNCTIONS
//
int getMoisture(int val1,int val2){
  int avg = (val1 + val2) / 2;
  return avg;
}

int reportMoisture(int avg) {
  String msg = "Moisture: ";
  msg += avg;
  Serial.print(msg);
}

// code from gardenbot.org
void setSensorPolarity(boolean flip){
  if(flip){
    digitalWrite(voltageFlipPin1, HIGH);
    digitalWrite(voltageFlipPin2, LOW);
  }else{
    digitalWrite(voltageFlipPin1, LOW);
    digitalWrite(voltageFlipPin2, HIGH);
  }
}


void loop() {
  currentLight = analogRead(lightPin); 
  currentTemp = getTempF();
  
  // moist sensor
  setSensorPolarity(true);
  int val1 = analogRead(moistSensorPin);
  delay(flipTimer);
  setSensorPolarity(false);
  int val2 = 1023 - analogRead(moistSensorPin);
  delay(flipTimer);
  currentMoist = getMoisture(val1,val2);
  
  // light sensor LED
  if (currentLight < 400) 
    digitalWrite(yLED, HIGH);
  else 
    digitalWrite(yLED, LOW);
  
  //temp sensor LED
  if (currentTemp > 80)
    digitalWrite(rLED, HIGH);
  else 
    digitalWrite(rLED, LOW);

  // moist sensor LED
  if (currentMoist > 600) 
    digitalWrite(rLED2, HIGH);
  else 
    digitalWrite(rLED2, LOW);
    
  Serial.print("Moisture: ");
  Serial.print(currentMoist);
  Serial.print("  Light: ");
  Serial.print(currentLight);
  Serial.print("   Temp: ");
  Serial.println(currentTemp);  
}