Hey guys I'm getting an error that is im pretty sure to do with how i am initializing my variables. It is: exit status 1 'threshold' does not name a type

Here's my code:

//Global Variables for moving max:

int analogValues[100];
int ir=0;
int maxA0=0;
int threshold = 0;
//Global variables for moving max ^^

//Global Variables for moving average ECG:
const int no_averages = 2; 

unsigned long time = 0, peak1 = 0, peak2 = 0;
int binaryrange, bpm, i=0; //not sure what i does tbh
int readings[no_averages]; // the readings from the analog input
int readIndex = 0; // the index of the current reading
int total = 0; // the running total
int average = 0; // the average which we will display as ECG

void setup() {
// initialize serial communication with computer:
// initialize all the readings to 0:
for (int thisReading = 0; thisReading < no_averages; thisReading++) {
readings[thisReading] = 0;

//set moving max shit to zero
  for (int is = 0; is < 100; is++) {

void loop() {
  //int maxA0=0; //Whether I intitate the variables here or globally, same error
  //int threshold = 0;
time = millis();

readings[readIndex] = analogRead(A0);
for (int ir=0; ir < no_averages; ir++) {
  average = average + readings[ir];
if (readIndex >= no_averages) {    // ...wrap around to the beginning of array if it has hit the end:
readIndex = 0;
average = average/no_averages;
if (average>1000) {
  average = 600;

if (ir>=100) {
  ir=0; } //This is to roll back to the start of the array if it surpasses the 100th array spot
for (int is = 0; is < 100; is++) {
 if (analogValues[is]>analogValues[is-1])


//This line with error:



if (average<threshold){
  binaryrange=0; }
if (average>threshold && binaryrange==0){
   Serial.print(" ");
//BPM code ^^

delay(8); // delay in between reads for stability



"The line with the error" falls outside of any functions. In C and C++ we write executable code inside functions. You placed your


(and everything that follows) outside of any functions. Hence the error.

Errors like this are typically cased by improper placement of { and } braces. But this is something you have learn to check for yourself. Most C or C++ oriented code editors can usually help you with this. And proper code formatting can help you with this too. What you have now is such a mess, that a simple error is virtually impossible to see.

  • Ah man that is embarrasing, just had a rogue "}" in there that ruined my code. Thanks! – glebecreator May 27 at 6:08
  • @glebecreator That's why is coding style and indentation so important. And even if you can't follow it, you can use Ctrl+T keystroke in Arduino IDE to reformat your code. If you try it, you'll spot part of code somehow misaligned. – KIIV May 27 at 7:15

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