Voice feedback from Arduino uno on certain operation

Other Hardware Audio
1 
#include "talkie.h"

Talkie voice;
const uint8_t spALERT[]  PROGMEM = {0xA5, 0xCF, 0xC6, 0xAB, 0x55, 0x5B, 0xAF, 0x39, 0xDA, 0xC9, 0x54, 0xDD, 0xBC, 0xC6, 0xC2, 0x3C, 0x27, 0x20, 0xCF, 0x1C, 0xD7, 0x30, 0xB0, 0x45, 0x16, 0x69, 0x1D, 0xC3, 0x11, 0xE4, 0x59, 0x8A, 0x7C, 0xB5, 0x9B, 0x8B, 0xD9, 0x30, 0xB7, 0xD3, 0x76, 0x19, 0x9A, 0x25, 0x59, 0x57, 0x59, 0xEC, 0x11, 0xAF, 0xE8, 0xD9, 0xF9, 0x2A, 0x8A, 0x1D, 0xF0, 0x75, 0x3F, 0x73, 0xAC, 0x87, 0x3B, 0xA2, 0x0B, 0xAA, 0x2B, 0xCF, 0xE4, 0x10, 0xA1, 0xDC, 0x45, 0x64, 0x03, 0x00, 0x80, 0x01, 0x66, 0x36, 0x33, 0xC0, 0xAB, 0xD5, 0x0A, 0x68, 0x25, 0x85, 0x02, 0xFF, 0x0F};

unsigned long ch[10],t[10];
int pulse=0;

void setup(){
    PCICR |=(1<<PCIE0);
    PCMSK0 |=(1<<PCINT0);
    Serial.begin(9600);
    
}
void loop(){
  if (ch[5]>1500){
       voice.say(spALERT); 
   }
}
  

ISR(PCINT0_vect){
    if(PINB & B00000001){
        t[pulse]=micros();
        switch(pulse){
            case 1:
            ch[1]=t[1]-t[0];
            pulse ++;
            if (ch[1]>3000){
                t[0]=t[1];
                pulse=1;
            }
            break;
            case 2:
            ch[2]=t[2]-t[1];
            pulse ++;
            if (ch[2]>3000){
                t[0]=t[2];
                pulse=1;
            }
            break;
            case 3:
            ch[3]=t[3]-t[2];
            pulse ++;
            if (ch[3]>3000){
                t[0]=t[3];
                pulse=1;
            }
            break;
            case 4:
            ch[4]=t[4]-t[3];
            pulse ++;
            if (ch[4]>3000){
                t[0]=t[4];
                pulse=1;
            }
            break;
            case 5:
            ch[5]=t[5]-t[4];
            pulse ++;
            if (ch[5]>3000){
                t[0]=t[5];
                pulse=1;
            }
            break;
            case 6:
            ch[6]=t[6]-t[5];
            pulse ++;
            if (ch[6]>3000){
                t[0]=t[6];
                pulse=1;
            }
            break;
            case 7:
            ch[7]=t[7]-t[6];
            pulse ++;
            if (ch[7]>3000){
                t[0]=t[7];
                pulse=1;
            }
            break;
            case 8:
            ch[8]=t[8]-t[7];
            pulse ++;
            if (ch[8]>3000){
                t[0]=t[8];
                pulse=1;
            }
            break;
            case 9:
            ch[9]=t[9]-t[8];
            pulse ++;
            if (ch[9]>3000){
                t[0]=t[9];
                pulse=1;
            }
            break;
            default:
            pulse ++;
            break;
      }
}}
}

Hi, in the above code I want a speaker to say "alert" only once when ch[5]>1500
(Which is a ppm pulse).But the problem is when the ch[5]>1500 it repeatedly says "alert" .How could I do that ????please help me I am a beginner to Arduino programming.

3

Okey. I see no problem in the text You posted, no question.
If You want it to look like code use autoformat in the IDE. Then use code tags before pasting the code.
This is told in the first topics telling how to get the best from this forum.

4

Use a boolean flag, test then set when the message is sent first time, and cleared when the condition goes false.

Look at the state-change examples.

5

Could you please describe it briefly I can't understand.

6

@ani2003
So eventually you did and then destroyed your question.
That is considered very selfish behaviour round here.

This has left nothing for others who might have the same problem in the future.
Much better would be to have left your question and then say how you solved it.

7

@Grumpy_Mike
Original question restored and locked as requested.

8

Thanks @PerryBebbington