Hi Guys
I assembled this countdown timer http://tech-zen.tv/episodes/shows/make-it-work/episodes/countdown-timer-with-an-arduino-episode-42 and was trying to change the sketch so that I could enter the time in millisecond. I would like to be able to enter up to 9.999 seconds.
Thanks GD
/*############################## COUNTDOWN TIMER ##################################
This sketch takes input from a keypad to enter the number of minutes and
seconds to count down. When the countdown starts an LED that represents
a relay will turn on. Once the countdown is complete the LED will turn
off.
The user can enter times using a keypad in MM:SS format. The # starts
the countdown. The * will clear the time and also stop the current
countdown once it starts.
To read the keypad input that is is a 4x4 input, we are using a
library from the arduino website called Keypad. You can download this
library at: http://arduino.cc/playground/Code/Keypad
From: Mike Myers (http://mikemyers.me) @netnutmike
Let's Make It Episode 42 (http://letmakeit.tv)
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################################################################################*/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
//constants for Control Pin
int controlPin = 13;
char currentTimeValue[4];
int currentState = 1;
int timerSeconds = 0;
int lpcnt = 0;
//define the keypad
const byte rows = 4;
const byte cols = 4;
char keys[rows][cols] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[rows] = {11,10,9,8};
byte colPins[cols] = {7,6,5,4};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, rows, cols);
LiquidCrystal_I2C lcd(0x3F,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
//display main screen
displayCodeEntryScreen();
//setup and turn off relay
pinMode(controlPin, OUTPUT);
digitalWrite(controlPin, LOW);
//setup default time to 00:00
currentTimeValue[0]='0';
currentTimeValue[1]='0';
currentTimeValue[2]='0';
currentTimeValue[3]='0';
showEnteredTime();
}
void loop()
{
int l;
char tempVal[3];
char key = keypad.getKey();
//key pressed and state is 1
if (int(key) != 0 and currentState == 1) {
switch (key) {
case '*':
relayStatus(false);
currentTimeValue[0]='0';
currentTimeValue[1]='0';
currentTimeValue[2]='0';
currentTimeValue[3]='0';
showEnteredTime();
currentState = 1;
lpcnt = 0;
timerSeconds = 0;
break;
case '#':
tempVal[0] = currentTimeValue[0];
tempVal[1] = currentTimeValue[1];
tempVal[2] = 0;
timerSeconds = atol(tempVal) * 60;
tempVal[0] = currentTimeValue[2];
tempVal[1] = currentTimeValue[3];
tempVal[2] = 0;
timerSeconds = timerSeconds + atol(tempVal);
currentState = 2;
break;
default:
currentTimeValue[0] = currentTimeValue[1];
currentTimeValue[1] = currentTimeValue[2];
currentTimeValue[2] = currentTimeValue[3];
currentTimeValue[3] = key;
showEnteredTime();
break;
}
}
if (currentState == 2) {
if (int(key) != 0) {
if (key == '*') {
relayStatus(false);
displayCodeEntryScreen();
currentTimeValue[0]='0';
currentTimeValue[1]='0';
currentTimeValue[2]='0';
currentTimeValue[3]='0';
showEnteredTime();
currentState = 1;
lpcnt = 0;
timerSeconds = 0;
}
} else {
if (lpcnt > 9) {
lpcnt = 0;
--timerSeconds;
showCountdown();
if (timerSeconds <= 0) {
currentState = 1;
relayStatus(false);
displayCodeEntryScreen();
showEnteredTime();
} else {
relayStatus(true);
}
}
++lpcnt;
delay(100);
}
}
}
void showEnteredTime()
{
lcd.setCursor(14,3);
lcd.print(currentTimeValue[0]);
lcd.print(currentTimeValue[1]);
lcd.print(":");
lcd.print(currentTimeValue[2]);
lcd.print(currentTimeValue[3]);
}
void relayStatus(bool state)
{
if (state)
digitalWrite(controlPin, HIGH);
else
digitalWrite(controlPin, LOW);
}
void showCountdown()
{
char timest[6];\
lcd.setCursor(0,0);
lcd.print("********************");
lcd.setCursor(0,1);
lcd.print("** COUNTING DOWN **");
lcd.setCursor(0,2);
lcd.print("** ");
sprintf(timest, "%d:%.2d", (timerSeconds/60), (timerSeconds - ((timerSeconds/60)*60)));
lcd.print(timest);
lcd.print(" **");
lcd.setCursor(0,3);
lcd.print("********************");
}
void displayCodeEntryScreen()
{
clearScreen();
lcd.setCursor(0,0);
lcd.print("Let's Make It Count");
lcd.setCursor(0,1);
lcd.print("Down Time...");
lcd.setCursor(0,2);
lcd.print("Enter Time mm:ss:");
}
void clearScreen()
{
lcd.setCursor(0,0);
lcd.print(" ");
lcd.setCursor(0,1);
lcd.print(" ");
lcd.setCursor(0,2);
lcd.print(" ");
lcd.setCursor(0,3);
lcd.print(" ");
}