LiquidCrystal Library - Serial Input
Demonstrates the use a 16x2 LCD display. The LiquidCrystal
library works with all LCD displays that are compatible with the
Hitachi HD44780 driver. There are many of them out there, and you
can usually tell them by the 16-pin interface.
This sketch displays text sent over the serial port
(e.g. from the Serial Monitor) on an attached LCD.
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
Library originally added 18 Apr 2008
by David A. Mellis
library modified 5 Jul 2009
by Limor Fried (http://www.ladyada.net)
example added 9 Jul 2009
by Tom Igoe
modified 22 Nov 2010
by Tom Igoe
This example code is in the public domain.
// include the library code:
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
//Number of pulses, used to measure energy.
long pulseCount = 0;
//Used to measure power.
unsigned long pulseTime,lastTime;
//power and energy
double power, elapsedkWh;
//Number of pulses per wh - found or set on the meter.
int ppwh = 1; //1000 pulses/kwh = 1 pulse per wh
// KWH interrupt attached to IRQ 1 = pin3
attachInterrupt(1, onPulse, FALLING);
// set up the LCD's number of columns and rows:
// initialize the serial communications:
// when characters arrive over the serial port...
lastTime = pulseTime;
pulseTime = micros();
power = (3600000000.0 / (pulseTime - lastTime))/ppwh;
//Find kwh elapsed
elapsedkWh = (1.0*pulseCount/(ppwh*1000)); //multiply by 1000 to pulses per wh to kwh convert wh to kwh
//Print the values.
lcd.write(" KW ");