Comments by bonezegei (Top 9 by date)

the code above works fine when i compiles it

but the board was set to an arduino uno
if the problem still exist even the board was set to AVR microcontroller try adding #include <arduino.h>

#include <softwareserial.h>

int PulseSensorPurplePin = A0; //not =0 since you are reading Analog Value the value 0 for input pin is at Digital pin 0 "A0" is used instead
int Signal;
int Threshold = 550; //variable should be initialize this way i think
int S;
int LED13=13; //you should declare LED 13 if its connected to pin 13

SoftwareSerial mySerial(10, 11);

void setup(){
pinMode (LED13, OUTPUT);
Serial.begin(9600);
mySerial.begin(9600);

}

void loop(){
Signal = analogRead(PulseSensorPurplePin);

S = (Signal / 8);

Serial.print("Your heart Beat is : ");

Serial.println(S,DEC); //it should be Serial.println not Serial.printIn
mySerial.println(S,DEC); //the data type I think should also be declared as Decimal or DEC

if (Signal > Threshold){
digitalWrite(LED13, HIGH);
}
else{
digitalWrite(LED13, LOW);
}

delay(1000);
}

Oh I found additional Errors

//This are typo errors from my code
SoftwareSerial mySerial(10, 11);
Signal = analogRead(PulseSensorPurplePin);


if that code was compiled with arduino
try checking if what board was set to your IDE this code will nost likely work uno mega Boards like arduino Uno and arduino mega..

If the board you chose was a different one refer to the pinout of the analog pin.. some boards does not have this type of pins thats why that type of error occurs..

Yeah you're right sir. Thank you for the reminder.

and I hope if people find my code they read the comment for them to understand it. Although its very simple code but some people just dont really get things that easy. 4 years back i failed a certain subject with that same algorithm. Programming is a very hard subject specially if you dont have your own computer to test some codes.