currentsensing_example.ino

// http://openenergymonitor.org/emon/node/1267
//inclue lcdLibrary
#include

//intialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

//set input pin

int sensorPin = A4;

int ledPowerOn = 3;
int ledPowerOff = 2;

int sensorMax;
int sensorMin;
int sensorValue;

void setup(void) {

//set up the LCD
lcd.begin(16, 2);

//Serial.begin(9600);
//set ledPin as an output
pinMode(ledPowerOff, OUTPUT);
pinMode(ledPowerOn, OUTPUT);
}

void loop(void) {

sensorMin = 1023;
sensorMax = 0;
sensorValue = 0;

for (int n = 0; n<200; n++)
{
sensorValue = analogRead(sensorPin);
if (sensorMax < sensorValue)
sensorMax = sensorValue;
if (sensorMin > sensorValue)
sensorMin = sensorValue;

}

if (sensorMax - sensorMin < 100)
{
digitalWrite(ledPowerOff, HIGH);
digitalWrite(ledPowerOn, LOW);

//write to lcd
lcd.clear();
lcd.print(sensorMax - sensorMin);

//Serial.print(max5 - min5);
//Serial.print(" ");
delay(1000);
}
else
{
digitalWrite(ledPowerOn, HIGH);
digitalWrite(ledPowerOff, LOW);

//write to lcd
lcd.clear();
lcd.print(sensorMax - sensorMin);

//Serial.print(max5 - min5);
//Serial.print(" ");
delay(1000);
}
}