advice needed for arduino as diesel injection brain...

Projects Programming
60

Test code using 9600 baud:

int ledPin = 13;

//variables to keep track of time of injection code////
unsigned long time1 = 0;
unsigned long time2 = 0;


void setup() 
{
  pinMode(ledPin, OUTPUT); 
  digitalWrite(ledPin, LOW);
  Serial.begin(9600);
}

void loop()
{

  digitalWrite(ledPin, HIGH);
  time1 = micros();
  Serial.print("light the LED for all to see! ");
  Serial.println(time1);

  Serial.print("Turn off the LED it does not need to be ");
  digitalWrite(ledPin, LOW);
  time2 = micros();
  Serial.println(time2);

  Serial.print("total time = ");
  Serial.print(time2 - time1);
  Serial.println("micros");
  delay(5000);  
}

Typical output in micros():

light the LED for all to see! 35358256
Turn off the LED it does not need to be 35373908
total time = 15652micros

Using 115200 baud:

light the LED for all to see! 35029036
Turn off the LED it does not need to be 35030356
total time = 1320micros

Removing all but total time print, code:

int ledPin = 13;

//variables to keep track of time of injection code////
unsigned long time1 = 0;
unsigned long time2 = 0;

void setup() 
{
  pinMode(ledPin, OUTPUT); 
  digitalWrite(ledPin, LOW);
  Serial.begin(115200);
}

void loop()
{
  digitalWrite(ledPin, HIGH);
  time1 = micros();

  digitalWrite(ledPin, LOW);
  time2 = micros();

  Serial.print("micros = ");
  Serial.println(time2 - time1);

  delay(5000);  
}

results:

micros = 12
micros = 12
micros = 8
micros = 8
micros = 8