How to get arduino to print something excatly once every milisecond?

Projects Programming
22

Try this :

int voltage;
int table[200];
unsigned long timee[200];
int n;
bool finish;
unsigned long ttimee;


void setup()
{
  pinMode(9, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
  digitalWrite(5, HIGH);
  Serial.begin(115200);
  digitalWrite(3, 0);
  analogWrite(9, 90);
  n = 0;
  finish = 0;
  ttimee = 0;
}

void loop()
{
  unsigned long currentTime = micros(); //only read micros() once
  if (n < 200)
  {
    if (currentTime - ttimee >= 1000)
    {
      voltage = analogRead(A0);
      table[n] = voltage;
      timee[n] = currentTime / 1000;
      n++;
      ttimee = currentTime;
    }
  }
  else if (!finish)
  {
    finish = true;
    analogWrite(9, 0);
    for (n = 0; n < 200; n++)
    {
      Serial.print(timee[n]);
      Serial.print("\t");
      Serial.println(table[n]);
    }
  }
}

Note the use of micros() instead of millis() and the fact that the current time is only read once then used elsewhere in the program