problem interfacing regarding iteration of for loop at interval of 1ms for800ms

Using Arduino Programming Questions
#1

Hi! I am doing a ecg project .In which I want 800 sensor reading at interval of 1ms for 800ms.After that I want to give delay of 800ms ,again want 800 sensor reading at interval of 1ms for 800ms and so on.But I am not getting desired output
Here is my code that I am writing on arduino ide but not getting the desired output.So please help me how can I get desired output.

Hereis code-

#include <EEPROM.h>

unsigned long previousMillis=0;

void setup() {
// initialize the serial communication:
Serial.begin(115200);
pinMode(10, INPUT); // Setup for leads off detection LO +
pinMode(11, INPUT); // Setup for leads off detection LO
}
unsigned long currentMillis;
void loop()
{
int t,i;
if((digitalRead(10)==1)||(digitalRead(11)==1))
{
Serial.println("!");
}else
{ for(i=0;i<800;i++)
{currentMillis=micros();
if(currentMillis-previousMillis>=1000)
{
previousMillis=currentMillis;
t=float(currentMillis)/1000;
Serial.print(t);
Serial.print(",");
Serial.println(analogRead(A0));}}}
delay(800);

}

#2

hg63370:
delay(800);

You're telling the processor to nothing but twiddle its fingers for 800ms. If this is not really your intent check out several things at the same time.

#3

what are you getting if not the "desired" output? The only thing that I see is you delcare 't' as an int and then compute '(float)CurrentMillis / 1000' but that just turns it back into an int. You should declare 't' as a float is that is what you want or at least an unsigned long.

#4