Project I - 3. 4 Digit Stopwatch using 7-Segment Display Based on Arduino

4Digit Stopwatch using 7-Segment Display

Such a stop watch in general that is calculate the time of initial emphasis (start) until the final emphasis (stop) with time lag is in milli seconds.

This tool uses Arduino UNO as its system processor. The START button is used to start timing calculations. STOP button to stop timing. RESET button to zero back stop watch value. While the seven segment 4 digits is use as the viewer of the results of stopwatch calculation.

Hardware Requirement

Arduino Uno Board
4 Digit of 7-Segment with Common Anode
2 Push Button
Power supply +5 Volt
Jumper

7-Segment | Source

Block Diagram

Schematic

7-Segment CA Wiring | Source

Arduino - 7 Segment Wiring

Source Code/Sketch

char stopWatch;
char menit, pulDetik, satDetik, ratMilli;
int sisaBagi;
unsigned long pengurang, dataStopWatch, dataPaus;
int segA = 2;
int segB = 3;
int segC = 4;
int segD = 5;
int segE = 6;
int segF = 7;
int segG = 8;
int segH = 9;
int dig1 = 10;
int dig2 = 11;
int dig3 = 12;
int dig4 = 13;
void setup() {
for(char i=2; i<14; i++){
pinMode(i,OUTPUT);
}
pinMode(A0,INPUT);
pinMode(A1,INPUT);
digitalWrite(A0,1);
digitalWrite(A1,1);
}
void loop() {
pengurang=millis();
if (digitalRead(A0)==0){
delay(100);
stopWatch = 1;
while(stopWatch){
dataStopWatch = ((millis() - pengurang)/100)+ dataPaus;
displaySeg();
if (digitalRead(A0)==0){
delay(100);
stopWatch = 0;
dataPaus = dataStopWatch;
}
}
}
else if(digitalRead(A1)==0){
dataStopWatch = 0;
dataPaus = 0;
}
displaySeg();
}
void displaySeg(){
menit = dataStopWatch / 600;
sisaBagi = dataStopWatch % 600;
pulDetik = sisaBagi / 100;
sisaBagi = sisaBagi % 100;
satDetik = sisaBagi / 10;
sisaBagi = sisaBagi % 10;
ratMilli = sisaBagi;
digitalWrite(dig4,1);
digitalWrite(dig1,0);
Seg(menit);
delay(6);
digitalWrite(dig1,1);
digitalWrite(dig2,0);
Seg(pulDetik);
delay(6);
digitalWrite(dig2,1);
digitalWrite(dig3,0);
digitalWrite(segH,0);
Seg(satDetik);
delay(6);
digitalWrite(segH,1);
digitalWrite(dig3,1);
digitalWrite(dig4,0);
Seg(ratMilli);
delay(6);
}
void Seg(char segment){
switch (segment){
case 0: digitalWrite(segA,0);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,0);
digitalWrite(segE,0);
digitalWrite(segF,0);
digitalWrite(segG,1);
break;
case 1: digitalWrite(segA,1);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,1);
digitalWrite(segE,1);
digitalWrite(segF,1);
digitalWrite(segG,1);
break;
case 2: digitalWrite(segA,0);
digitalWrite(segB,0);
digitalWrite(segC,1);
digitalWrite(segD,0);
digitalWrite(segE,0);
digitalWrite(segF,1);
digitalWrite(segG,0);
break;
case 3: digitalWrite(segA,0);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,0);
digitalWrite(segE,1);
digitalWrite(segF,1);
digitalWrite(segG,0);
break;
case 4: digitalWrite(segA,1);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,1);
digitalWrite(segE,1);
digitalWrite(segF,0);
digitalWrite(segG,0);
break;
case 5: digitalWrite(segA,0);
digitalWrite(segB,1);
digitalWrite(segC,0);
digitalWrite(segD,0);
digitalWrite(segE,1);
digitalWrite(segF,0);
digitalWrite(segG,0);
break;
case 6: digitalWrite(segA,0);
digitalWrite(segB,1);
digitalWrite(segC,0);
digitalWrite(segD,0);
digitalWrite(segE,0);
digitalWrite(segF,0);
digitalWrite(segG,0);
break;
case 7: digitalWrite(segA,0);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,1);
digitalWrite(segE,1);
digitalWrite(segF,1);
digitalWrite(segG,1);
break;
case 8: digitalWrite(segA,0);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,0);
digitalWrite(segE,0);
digitalWrite(segF,0);
digitalWrite(segG,0);
break;
case 9: digitalWrite(segA,0);
digitalWrite(segB,0);
digitalWrite(segC,0);
digitalWrite(segD,0);
digitalWrite(segE,1);
digitalWrite(segF,0);
digitalWrite(segG,0);
break;
}
}