Greetings,
I’m a beginner in arduino, I got this coding off the internet on how to make a countdowntimer ;
Components used:
16x2 LCD
4x4keypad
potentiometer
push button
2 220ohm resistor
1 10kohm resistor
1 LED
1 Buzzer
I tried running the code, the display is as I wanted but when i input the value on LCD it doesnt count down but it says “Countdown begins” and redisplay “HH:MM:SS”
it says theres an error on
void setFeedingTime() in r*=key-48;*
I will really appreciate any sort of explanation and help
All credits to the original coder: Arduino Countdown Timer.
#include <LiquidCrystal.h>
#include <Keypad.h>
const byte ROWS = 4; // Four rows
const byte COLS = 4; // Three columns
long int set1;
long int set2;
long int set3;
long int set4;
long int j;
String hours;
String minutes;
String seconds;
// Define the Keymap
char keys[ROWS][COLS] = {
- {‘1’,‘2’,‘3’,‘A’},*
- {‘4’,‘5’,‘6’,‘B’},*
- {‘7’,‘8’,‘9’,‘C’},*
_ {’*’,‘0’,’#’,‘D’}_
};
byte rowPins[ROWS] = { 6, 7, 8, 9 };// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins
byte colPins[COLS] = { 10, 11, 12, 13 };// Connect keypad COL0, COL1 and COL2 to t
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
LiquidCrystal lcd(A0, A1, 5, 4, 3, 2); // Creates an LC object. Parameters: (rs, enable, d4, d5, d6, d7)
int t1, t2, t3, t4, t5, t6;
int r1, r2, r3;
boolean feed = true; // condition for alarm
char key;
String r[8];
void setFeedingTime()
{
-
feed = true;*
-
int i=0;*
-
lcd.clear();*
-
lcd.setCursor(0,0);*
-
lcd.print(“Set feeding Time”);*
-
lcd.clear();*
-
lcd.print(“HH:MM:SS”);*
-
lcd.setCursor(0,1);*
-
while(1){*
-
key = kpd.getKey();*
-
char j;*
-
if(key!=NO_KEY){*
-
lcd.setCursor(j,1);*
-
lcd.print(key);*
_ r = key-48;_
* i++;*
* j++;*
* if (j==2 || j == 5)*
* {*
* lcd.print(":"); j++;*
* }*
* delay(500);*
* }*
* if (key == ‘D’)*
* {key=0; break; }*
* }*
lcd.clear();
}
void setup()
{
* lcd.begin(16,2);*
* Serial.begin(9600);*
* pinMode(A0, OUTPUT);*
* pinMode(A1, OUTPUT);*
* pinMode(A3, INPUT);*
* pinMode(A4, OUTPUT);*
}
void loop()
{
* lcd.setCursor(0,0);*
* lcd.print(“Arduino Timer”);*
* //Serial.println(A3);*
* if (digitalRead(A3)==1) //*
* {*
* lcd.clear();*
* setFeedingTime();*
* for(int i = 0; i < 6; i++) // this for loop is used to get the value of the feeding time and print it serially*
* {*
_ Serial.print(r*);
Serial.println();
}*_
* hours = String (r[0]) + String (r[1]) ; //combining two separate int values of r[0] and r[1] into one string and save it to “hours”*
* minutes = String (r[2]) + String (r[3]) ; //combining two separate int values of r[2] and r[3] into one string and save it to “minutes”*
* seconds = String (r[4]) + String (r[5]) ; //combining two separate int values of r[4] and r[5] into one string and save it to “seconds”*
_ set1 = (hours.toInt()3600); //converting hours into seconds_
_ set2 = (minutes.toInt() * 60); //converting minutes into seconds_
_ set3 = seconds.toInt();
set4 = (hours.toInt() * 3600)+ (minutes.toInt() * 60) + seconds.toInt(); //adding set1, set2 and set3 together in set4_
_ Serial.print(“set4”);
Serial.print(set4);
Serial.println();
lcd.setCursor(0,0);
lcd.print(“Countdown begins”);
delay(1000);
lcd.clear();*_
* for(long int j = set4; j >= 0; j–) // this for loopis used to decrease the total time in seconds*
* {*
* Serial.println(j);*
* lcd.setCursor(0,0);*
* lcd.print(“HH:MM:SS”);*
* long int HH = j / 3600; // converting the remaining time into remaining hours*
* lcd.setCursor(0,1);*
* Serial.println(HH);*
* if (HH < 10) { lcd.print(‘0’); }*
* lcd.print(HH);*
* lcd.print(":");*
_ long int MM = (j - (HH3600))/60 ; //converting the remaining time into remaining minutes_
_ lcd.setCursor(3,1);
Serial.println(MM);
if (MM < 10) { lcd.print(‘0’); }
lcd.print(MM);
lcd.print(":");*_
_ long int SS = j - ((HH3600)+(MM60)); //converting the remaining time into remaining seconds_
* lcd.setCursor(6,1);*
* Serial.println(SS);*
* if (SS < 10) { lcd.print(‘0’); }*
* lcd.print(SS);*
* delay(1000);*
* if (digitalRead(A3)==1){break;}*
* if (j == 0)*
* {*
* lcd.clear();*
* lcd.setCursor(0,0);*
* lcd.print(“Timer Stop”);*
* lcd.setCursor(2,1);*
* lcd.print("-Ring-Ring-");*
* for(int k =0; k<= 100; k++) //this for loop is used for the buzzer to beep 100 time as the timer reaches zero*
* {*
* digitalWrite(A4,HIGH);*
* delay(300);*
* digitalWrite(A4,LOW); *
* delay(300);*
* if (digitalRead(A3)==1){break;} *
* }*
* }*
* }*
* }*
*} *
//I’ve also attached the code below
sketch_may25a.ino (3.97 KB)
